Finding the right team to transform your home or business can feel like searching for a hidden gem. Each service brings its own promise of expertise and peace of mind, yet the differences in approach, cost and quality can surprise even the savviest homeowner. Some focus on hands-on project management and detailed planning, while others stand out through local knowledge or lasting guarantees. Curious about which features actually make a lasting difference or which provider could suit your unique space? The answers may reveal a new way to approach your next project.
Table of Contents
- Reltic Extend
- Plus Rooms
- Milan Design & Build
- Simply Extend
- Build Team
- The Market Design & Build
- LMB Group
Reltic Extend
At a Glance
Reltic Extend is a specialist extension designer and builder for London and Surrey, focused on bespoke kitchen, rear, side, wraparound and double-storey projects. Their approach combines over 20 years of hands-on experience with clear, stage-by-stage pricing and full handling of planning permissions, so you know what to expect at every step. Projects are managed by a dedicated project manager and delivered by in-house tradesmen, backed by a 10-year structural warranty and six months of aftercare. Bottom line: dependable, transparent and tailored to London homeowners who want to maximise space and property value without relocating.
Core Features
Reltic Extend delivers tailored home extensions designed specifically for London living: bespoke layouts for kitchens and living areas, transparent stage-by-stage pricing with no hidden costs, and full management of planning permissions and building regulation approvals. Every project receives a dedicated project manager and benefits from in-house tradesmen to maintain quality and schedule adherence across London and Surrey. The service covers rear, side, wraparound and double-storey extensions and emphasises durability, legal compliance and seamless project delivery.
Pros
- Over 20 years of experience in building home extensions in London gives the team deep local knowledge and practical problem-solving for common planning and structural challenges.
- A strong reputation, with over 70% of projects coming from referrals, demonstrates consistent customer satisfaction and repeat advocacy.
- Comprehensive end-to-end project management means you receive design, planning and construction coordination from a single accountable team member throughout the build.
- A 10-year structural warranty and six months of aftercare provide long-term confidence in build quality and post-handover support.
- Transparent, fixed pricing with detailed cost breakdowns reduces budget uncertainty and helps homeowners make informed decisions early in the process.
Who It’s For
Reltic Extend is ideal for London homeowners and families who prioritise a high-quality, bespoke extension and who value professional project management and regulatory compliance. If you want to avoid moving and instead maximise your existing property’s space and value — for example by creating a larger kitchen-diner or adding a double-storey extension — this service is tailored to your needs. It also suits investors and homeowners across south, north, east and west London and adjacent Surrey locations seeking a local specialist.
Unique Value Proposition
Reltic Extend stands out because it merges local expertise with complete transparency and accountable delivery. Unlike companies that fragment design, planning and construction, Reltic provides a single, managed pathway: a dedicated project manager, in-house tradesmen to control workmanship and scheduling, and a clear stage-by-stage pricing model so you see cost implications at each milestone. Their willingness to handle all planning permissions and building regulations reduces the administrative burden on you and mitigates risk of delays — a major advantage in London’s complex planning landscape. The 10-year structural warranty underscores a commitment to durability, while the high referral rate evidences consistent client satisfaction. In short: fewer unknowns, fewer subcontractor handovers, and a supplier model built around London property realities.
Real World Use Case
A typical scenario: a London family commissions a rear kitchen extension to join living and cooking spaces. Reltic Extend designs the layout, secures planning permission, manages approvals, and co-ordinates in-house trades to complete the build on schedule. The family benefits from transparent cost breakdowns, regular updates from one project manager and the reassurance of a 10-year structural warranty on completion.
Pricing
Reltic Extend publishes stage-by-stage pricing with no hidden costs, offering detailed cost breakdowns at each phase; however, specific price ranges and build durations are not listed on the website and are provided during the consultation and quote stage.
Website: https://relticextend.co.uk
Plus Rooms
At a Glance
Plus Rooms is a London-based bespoke design and build company specialising in home extensions across London and Surrey. Their strength lies in end-to-end project management, taking projects from planning permission through to handover with clear coordination of trades. You can expect high standards of workmanship and transparent communication for most projects. If you value a tailored build and expert handling of planning and legal matters, Plus Rooms is a strong contender.
Core Features
Plus Rooms offers bespoke house extensions including side, rear, wraparound and flat roof extensions, coupled with full project management from planning permission to completion. They provide design consultation and bespoke reports, and coordinate all required trades such as builders, electricians and plumbers. The team has demonstrable experience handling planning permission, permitted development and party wall agreements, which reduces the administrative burden on homeowners.
Pros
- High standard of workmanship and attention to detail is evident in their bespoke portfolio, which many clients cite as a reason for recommendation.
- Comprehensive project management reduces stress for clients because the company handles planning, scheduling and trade coordination from start to finish.
- Good communication and transparency throughout the project are regularly reported by customers, helping homeowners feel informed at key stages.
- An experienced team with positive customer reviews provides reassurance that complex builds are managed professionally.
- Ability to handle complex projects, including planning and legal aspects, makes them a practical choice for extensions that require permissions or party wall agreements.
Cons
- Projects have occasionally suffered delays due to sourcing materials or external factors such as pandemic disruptions, which can extend timelines unexpectedly.
- Some clients noted that communication at the design stage could be improved, particularly around early decisions that affect budget and finish.
- Pricing is provided as custom quotes based on project scope and requirements, which means there is no simple price list and you will need a detailed consultation to understand likely costs.
Who It’s For
Plus Rooms is ideal for homeowners in London and Surrey who want a bespoke, high-quality extension with minimal hands-on management. If you prefer a single point of contact to manage design, permissions and construction, and you value finish and attention to detail over a low-cost, off-the-shelf solution, this team fits well. Investors or families seeking to increase living space or reconfigure layouts will particularly benefit.
Unique Value Proposition
What sets Plus Rooms apart is their combination of bespoke design sensibilities with practical, full-service project management and experience navigating planning and legal hurdles. They translate design intent into buildable solutions while coordinating trades and permissions, which reduces risk and simplifies the process for clients.
Real World Use Case
A family in North London commissions Plus Rooms to design and build a rear and side extension to improve natural light and open-plan living. Plus Rooms manages planning, party wall agreements, design consultations, contractor coordination and final fittings, delivering a transformed living space without the homeowner needing to juggle multiple contractors.
Pricing
Custom quotes based on project scope and requirements.
Website: https://plusrooms.co.uk
Milan Design & Build
At a Glance
Milan Design & Build is a San Diego‑based design and construction firm offering full home remodelling, kitchen and bathroom upgrades, home additions and landscape works. With more than a decade of experience they emphasise a personalised, collaborative approach that aims to increase property value and improve energy efficiency. The team mixes contractors and interior designers to deliver projects from concept through to completion, though the website is primarily informational and omits clear pricing or booking tools. Bottom line: a capable full‑service studio for homeowners who value bespoke design and hands‑on project management, but expect to engage in direct enquiry for cost and timescale details.
Core Features
Milan provides end‑to‑end remodelling and construction services, including full home remodelling, home additions, kitchen and bathroom remodelling, plus landscape and hardscape services and window and door installation. Their process is described as collaborative, involving designers and contractors to align aesthetics, practicality and efficiency. The emphasis on energy efficiency and value uplift suggests they consider both design quality and long‑term performance in their proposals.
Pros
- Personalised design and delivery: Milan adopts a tailored approach so each project reflects the homeowner’s priorities and site constraints.
- Decade of practical experience: Over ten years in the field indicates a track record that can reduce common execution risks.
- Collaborative process: The combined design–construction workflow helps avoid miscommunication between designers and builders.
- Value and efficiency focus: Their stated aim to increase property value and energy efficiency adds measurable goals beyond aesthetics.
- Wide service offering: From interior remodelling to landscape and installation work, Milan can coordinate multiple trades on a single brief.
Cons
- Limited pricing transparency: The website does not publish cost examples, which makes initial budgeting difficult for prospective clients.
- No instant quotes or booking: Absence of online booking or quote tools means more time spent on enquiries and meetings before a decision.
- Sparse public testimonials: There is no clear listing of customer reviews or case studies on the site, reducing visible social proof.
- Location‑specific focus: Being San Diego‑based, their local expertise does not directly serve clients outside California without further clarification.
Who It’s For
Milan is best suited to homeowners in San Diego and surrounding Californian markets who want a single supplier to manage design and construction for medium to large remodelling projects. If you prefer personalised design, hands‑on project management and value‑driven outcomes rather than a self‑service online quotation, this firm is a sensible fit.
Unique Value Proposition
Milan’s unique value is the integration of interior design expertise with practical contracting under one roof, aiming to deliver aesthetically cohesive projects that also target increased property value and improved energy performance.
Real World Use Case
A homeowner with an ageing kitchen and small garden could commission Milan to redesign the kitchen, add a ground‑floor extension for open‑plan living, upgrade bathroom fittings and rework the landscape, with the company managing planning, trade coordination and finishes from concept to handover.
Pricing
Pricing is not specified on the website; interested clients must contact Milan directly for proposals and detailed estimates.
Website: https://milanbuild.com
Simply Extend
At a Glance
Simply Extend is a specialist home extension builder focusing on London and the West Midlands, offering end-to-end design, planning and construction for bespoke extensions. Their approach centres on personalised solutions, fixed prices and a 10-year structural warranty, which makes them a reassuring choice for homeowners who value clarity and quality. They provide a free site survey and detailed quotes, although their geographic reach is limited to specific regions. Bottom line: dependable for local homeowners who want transparent, managed projects rather than a low-cost, nationwide option.
Core Features
Simply Extend delivers bespoke home extension projects that include kitchen, rear, side return, wraparound extensions and loft conversions. Core services comprise free site surveys, detailed quotes, architectural design and planning support, and full construction management through to completion. Fixed pricing and a 10-year warranty are standard features designed to reduce financial surprises and provide long-term assurance. The company emphasises tailored design work and customer satisfaction, with project management that aims to keep timelines and budgets clear from the outset.
Pros
- Extensive regional experience: Simply Extend has completed numerous projects across London and the West Midlands, which demonstrates practical knowledge of local building styles and planning considerations.
- Comprehensive end-to-end service: They manage design, planning and construction, meaning you deal with one supplier from concept to handover and avoid coordination headaches.
- Personalised design solutions: Their bespoke approach ensures your extension is tailored to how you live and to the property’s character, rather than a one-size-fits-all box.
- Transparent pricing and warranties: Fixed prices after a survey and a 10-year structural warranty offer financial clarity and peace of mind throughout and after the build.
- Positive client feedback: Strong testimonials suggest a high level of customer satisfaction and reliable project delivery for many clients.
Cons
- Limited service area: Their primary operation in London and the West Midlands means homeowners outside those regions cannot access their services without significant limitations.
- Planning permission dependency: Projects remain subject to local planning decisions and timescales, which can introduce delays beyond the builder’s control.
- Variable cost and duration: While prices are fixed post-survey, overall cost and project length still fluctuate with complexity, so more intricate projects will likely take longer and cost more.
Who It’s For
Simply Extend is ideal for homeowners in London and the West Midlands who want a reliable, experienced builder to deliver a bespoke extension with clear pricing and professional project management. If you value design input, a single point of contact and a formal warranty, this is a good match.
Unique Value Proposition
Their selling point is a full-service, customer-centred model combining bespoke design, fixed pricing and a 10-year warranty, aimed at minimising surprises and delivering lasting value to properties in their operating areas.
Real World Use Case
A London family looking to create a larger open-plan kitchen to accommodate family life and increase property value would engage Simply Extend for a free survey, receive a detailed quote and have the project designed, consented and built under one contract.
Pricing
Fixed prices are provided following an initial consultation and free site survey, with detailed quotes issued thereafter rather than blanket online estimates.
Website: https://simplyextend.co.uk
Build Team
At a Glance
Build Team is a London-focused design and build management practice that combines fixed-fee design packages with end-to-end project oversight. They offer a free 30-minute design consultation and present numerous case studies and virtual tours to help you visualise likely outcomes. The firm guarantees workmanship with a three-year structural warranty and positions itself as a transparent, client-centred option for homeowners wanting an uncomplicated extension process. Bottom line: reliable for full-scope projects, but expect to request exact costs rather than find them listed upfront.
Core Features
Build Team’s core capability is managing extensions from initial concept through to completion, using fixed fee design packages to simplify budget discussions. They provide a complimentary 30-minute consultation to scope projects, online project tours and galleries for visualisation, and a three-year structural guarantee to give you post-completion assurance. Their focus is on clear communication and professional project management rather than partial or DIY support, which keeps delivery streamlined and predictable.
Pros
- Transparent pricing approach: Fixed-fee design packages and clear stage descriptions reduce uncertainty in early planning conversations.
- Professional project management: The team coordinates design, planning and build phases to keep timelines and communication organised.
- Quality delivery and client satisfaction: Case studies and testimonials indicate consistently high-quality finishes and positive client feedback.
- Useful visualisation tools: Virtual tours and online galleries help you see finished rooms and make informed design choices.
- Local trust in London: They are trusted by a large number of London homeowners, which speaks to repeatable processes and local experience.
Cons
- Limited upfront pricing detail: The website is primarily promotional and does not list specific costs, requiring a consultation to understand total fees.
- Less flexibility for DIY or piecemeal projects: Services focus on full design and build management, so homeowners seeking partial support may find options restricted.
- Consultation scheduling required: The free 30-minute session is useful but generally needs to be booked in advance, which may slow an urgent start.
Who It’s For
Build Team is ideal for London homeowners who want a single point of contact to manage a house extension or renovation from design through construction. If you prefer fixed-fee design packages, value visual previews, and want a team experienced in local planning practises, this is a strong match. It suits families and investors seeking a turnkey approach rather than hands-on or staged involvement.
Unique Value Proposition
Build Team’s distinct offer is a predictable, fixed-fee design pathway complemented by end-to-end build management and virtual project visualisation. Coupled with a three-year structural guarantee and a robust portfolio of London projects, they simplify decision-making and reduce the common stress points of extension work.
Real World Use Case
A London homeowner planning a rear extension books the free 30-minute consultation to clarify scope, uses Build Team’s virtual tours to select finishes, then relies on the team to obtain planning, manage contractors and deliver the extension under a three-year guarantee. A single contractual relationship keeps responsibility clear throughout.
Pricing
Build Team sells fixed fee design packages with payment in arrears; however, specific costs are not disclosed on the website. Expect to book the free consultation to receive a tailored estimate and full pricing breakdown.
Website: https://buildteam.com
The Market Design & Build
At a Glance
The Market Design & Build is a well-established London practice delivering end-to-end design and build services for home extensions, loft conversions and refurbishments. With an in-house team and a track record of hundreds of bespoke projects, they offer a streamlined single-point solution from consultation to completion. Their high customer satisfaction — over 700 positive reviews — signals reliability, though pricing and lead-time transparency are limited. Overall: strong for London homeowners who want a managed, high-touch service. Worth considering.
Core Features
The firm provides a full-service package that covers consultation, planning, design and execution, specialising in lofts, extensions and comprehensive refurbishments. Their in-house team brings consolidated expertise so clients avoid the friction of appointing multiple contractors. They also emphasise bespoke architectural services, having completed numerous tailored projects across London and surrounding areas. The workflow promises continuity: initial concept, planning applications, construction and handover all under one roof.
Pros
- True end-to-end delivery: They manage every project stage, reducing the coordination burden on you and keeping a single team accountable for results.
- Experienced in-house team: Having architects and builders on staff improves design-build integration and reduces misunderstandings between design intent and construction delivery.
- Range of project types: They cover loft conversions, rear and side extensions and full home refurbishments, so you can consolidate several renovation needs with one supplier.
- Proven track record: Completing hundreds of bespoke projects demonstrates practical experience with London properties and planning complexities.
- Strong client feedback: Over 700 positive reviews on platforms such as Checkatrade and Google point to consistent customer satisfaction.
Cons
- Geographic limitation: Their primary focus on London and nearby areas means homeowners outside this region may not have access to their services.
- Lack of published pricing: The website does not provide detailed pricing information, which makes early budget planning difficult for prospective clients.
- Unclear turnaround times: There is limited information on typical project durations or current availability, so you may need to request a bespoke timeline during initial contact.
Who It’s For
This firm suits London-based homeowners, families and property investors who prefer a managed, design-led approach and value continuity across design and construction. If you want a single contractor to handle planning, architectural details and on-site delivery without coordinating multiple trades, this is a sensible match. It also appeals to clients seeking bespoke architectural input rather than off-the-shelf extensions.
Unique Value Proposition
Their differentiator is the integrated in-house model: architects and builders working together from day one to deliver bespoke extensions and loft conversions tailored to London properties. That cohesion reduces rework, preserves design intent and often makes planning interactions smoother.
Real World Use Case
A London homeowner looking to create a new rear extension and loft conversion can hire The Market Design & Build to manage planning applications, design the new spaces, coordinate structural works and deliver the finished project — all overseen by the same team from start to finish.
Pricing
Not specified on the website; you will need to contact them for a bespoke quote based on scope and location.
Website: https://themarketdesignbuild.com
LMB Group
At a Glance
LMB Group positions itself as a dependable specialist in mechanical, electrical and HVAC services with a strong emphasis on professional, client-centred delivery. The firm serves clients nationwide while retaining Yorkshire roots and promotes industry compliance and innovation as core pillars. If you need a partner for building services rather than a one-off contractor, LMB Group reads as a trustworthy choice — though expect to need direct contact for detailed cost information.
Core Features
LMB Group’s capabilities centre on integrated mechanical and electrical solutions coupled with HVAC expertise, enabling end-to-end delivery for commercial and industrial projects. Their nationwide service model and client partnership focus suggest they manage projects that require coordination across disciplines and stakeholders. The company also emphasises adherence to industry standards and ongoing innovation, which indicates they prioritise both safety and up-to-date technical approaches.
Pros
- Comprehensive building services expertise: LMB Group offers a wide skillset across mechanical, electrical and HVAC disciplines, allowing you to consolidate multiple trades under one provider.
- Focus on customer satisfaction and trust: The company highlights collaborative relationships, which suggests they prioritise clear communication and long-term client partnerships.
- Innovative and industry-compliant solutions: Their stated emphasis on remaining current with industry developments points to practices that align with regulation and emerging best practice.
- Collaborative approach with clients: A partnership model implies flexibility and a willingness to integrate with your team or facilities management processes.
- Safety and well-being commitment: A clear focus on safety reduces operational risk during installation and maintenance phases.
Cons
- Lack of published pricing: Specific service costs are not listed on the website, so you must contact LMB Group directly to obtain estimates and compare budgets.
- Limited project portfolio visibility: The site provides little in the way of case studies or detailed project examples, which makes it harder to assess real-world outcomes and workmanship at a glance.
- No clear online booking or consultation process: There is no obvious digital booking or consultation pathway, so initiating a project may require phone or email exchanges rather than a streamlined online workflow.
Who It’s For
LMB Group is best suited to businesses, facilities teams and organisations seeking reliable mechanical, electrical and HVAC services — particularly commercial or industrial clients who value compliance, safety and a collaborative supplier relationship. If you manage multiple systems and prefer a single point of contact for installations and ongoing maintenance, this firm matches those priorities.
Unique Value Proposition
The core appeal of LMB Group lies in its integrated service offer: mechanical, electrical and HVAC expertise delivered with a partnership mentality and a clear emphasis on compliance and innovation. That combination is useful when you need cohesive, technically sound solutions rather than piecemeal contractors.
Real World Use Case
A commercial building management team engages LMB Group to design, install and maintain their HVAC and electrical systems, ensuring regulatory compliance, coordinated scheduling and consistent performance across the estate.
Pricing
Not specified on the website; interested parties should request a tailored quotation to understand costs and timelines.
Website: https://lmb-group.co.uk
Home Extension Services Comparison
This table provides a comprehensive overview of various home extension services available in London and beyond, helping homeowners compare features, pros, cons, and pricing for better decision-making.
| Company | Core Features | Pros | Cons | Pricing |
|---|---|---|---|---|
| Reltic Extend | Bespoke extensions, 10-year warranty, dedicated project manager | Over 20 years of experience, strong referrals, transparent pricing | Price and build duration details only at consultation stage | Detailed quotes post-consultation |
| Plus Rooms | Bespoke extensions, full project management | High workmanship, good communication, handles complex projects | Delays due to material sourcing, requires detailed consultation for pricing | Custom quotes based on scope |
| Milan Design | Full home and landscape remodelling, energy efficiency focus | Personalised design, collaborative approach, value-driven outcomes | Limited pricing transparency, no online booking tools | Must contact for proposals |
| Simply Extend | End-to-end service, bespoke designs, 10-year warranty | Extensive experience in London, fixed prices, strong client feedback | Limited to London and West Midlands, planning dependencies | Fixed prices post-survey |
| Build Team | Fixed-fee design packages, virtual tours | Transparent pricing approach, professional management, visual tools | Consultation required for pricing, less flexibility for partial projects | Fixed-fee design packages |
| The Market | Full-service design and build, bespoke architectural services | True end-to-end delivery, experienced team, strong client feedback | Focused on London, lack of published pricing | Must contact for bespoke quote |
| LMB Group | Mechanical, electrical, HVAC services, client partnership focus | Comprehensive expertise, customer satisfaction emphasis, innovative solutions | Lack of published pricing, limited project portfolio visibility | Must request detailed quote |
Maximise Your Kitchen Extension Success with Trusted Expertise
Choosing the right kitchen extension builder can be daunting especially when aiming to add space, improve functionality and boost property value without the stress of relocation. This article highlights the challenges homeowners face such as navigating complex planning permissions, understanding transparent pricing, and ensuring quality workmanship throughout the project. Many seek bespoke solutions tailored to London living that combine style with durability and compliance.
At Reltic Extend we understand these concerns deeply. With over 20 years of experience crafting kitchen and home extensions in London and Surrey we offer clear stage-by-stage pricing with no hidden costs plus fully managed planning approvals. Our dedicated project managers and in-house tradesmen work closely with you to bring your vision to life while providing the reassurance of a 10-year structural warranty. Discover helpful insights in our Design & Build Tips for Home Extensions and stay updated with expert advice in Home Extension Advice & Updates.
Ready to transform your kitchen space with confidence and clarity Contact us today at Reltic Extend Contact Page to schedule your free consultation. Take the first step towards a seamless, high-quality extension designed around your lifestyle and needs.
Frequently Asked Questions
What should I consider when choosing a kitchen extension builder?
Choosing a kitchen extension builder involves evaluating their experience, portfolio, and customer reviews. Look for builders with a strong track record in managing kitchen extension projects similar to yours to ensure quality and professionalism.
How long does a typical kitchen extension project take?
The duration of a kitchen extension project can vary, but most projects are completed within 12 to 20 weeks from design to completion. To get an exact timeline, consult directly with your builder during the planning phase.
What are the common costs associated with a kitchen extension?
Common costs for a kitchen extension include design fees, construction materials, labour, and any necessary permits. Prepare a budget that accounts for these components, and consider unexpected expenses by adding around 10-15% as a buffer.
How can I ensure my kitchen extension meets local planning regulations?
To ensure your kitchen extension meets local planning regulations, work closely with your chosen builder who is experienced in navigating these requirements. They can help you manage the application process and meet all necessary criteria to avoid delays or issues.
What is the typical warranty coverage for kitchen extensions?
Warranty coverage for kitchen extensions usually ranges from 10 to 15 years, depending on the builder. Confirm the specifics of their warranty during your initial discussions to ensure you have adequate coverage for structural integrity and workmanship.
How do I prepare for a consultation with a kitchen extension builder?
To prepare for a consultation, gather your ideas, budget, and any architectural plans you may have. Outline your desired specifications and expectations, as this will help your builder understand your vision and provide a more accurate proposal.
