Thinking about adding more space or value to your home can be both exciting and overwhelming. From the first ideas to the final touches, every step matters when planning a house extension. There are professionals ready to manage design, permissions, construction, and finishes for you, each promising a smoother process and big results. With so many routes and services to pick from, finding the right team is a key decision. Curious about what sets some of the top options apart and how they approach building your dream space? Read on to discover how these experts promise to make your home extension safer, simpler, and even inspiring.
Table of Contents
- Reltic Extend
- LCCL Construction – House Extensions
- Simply Extend
- Plus Rooms
- Buildteam London
- The Market Design & Build
Reltic Extend
At a Glance
Reltic Extend specialises in designing and building bespoke home extensions across London and Surrey, focusing on modern, stylish and functional spaces tailored to your lifestyle. They combine clear, stage-by-stage pricing with full planning-permission support and hands-on project management to deliver projects on time and within budget. If you want a low-stress, professionally managed extension that prioritises durability and legal compliance, Reltic Extend is an excellent choice.
Core Features
Reltic Extend offers single-storey, double-storey, side return and wraparound extensions delivered through a structured process: transparent stage-by-stage pricing, full handling of planning permissions, and assignment of a dedicated project manager for every project. Each job includes a 10-year structural warranty and six months of aftercare support, so you get both build quality and post-completion reassurance. The service is intentionally end-to-end — from initial design through approvals to completion — aimed at homeowners who prefer a single trusted partner for their build.
Pros
- Strong reputation driven by referrals: Over 70% of projects come from recommendations, which demonstrates consistent client satisfaction and reliable outcomes.
- Transparent fixed pricing: Stage-by-stage pricing removes surprises and makes budgeting straightforward for homeowners.
- Full management of planning permissions: Reltic Extend handles permits and regulatory compliance, reducing delays and stress for you.
- Durable construction with long-term warranty: A 10-year structural warranty and aftercare support safeguard your investment.
- Experienced team and high-quality workmanship: The dedicated project manager model ensures accountability and a single point of contact throughout the build.
Who It’s For
Reltic Extend is ideal for homeowners in London and Surrey who want bespoke, professionally managed home extensions and value transparency and quality craftsmanship. If you’re looking to add space, create an open-plan kitchen, or increase your property’s value without juggling multiple contractors, this service fits perfectly. You want someone to oversee planning permissions, maintain clear costs, and finish on schedule — that someone is Reltic Extend.
Unique Value Proposition
What sets Reltic Extend apart is the combination of transparent, stage-by-stage pricing and comprehensive project ownership. Many builders offer either design or build, or publish ballpark costs that later change. Reltic Extend instead provides a predictable pricing framework and assumes responsibility for planning permission and regulation — reducing risk and administration for you. The dedicated project manager model means continuity and clear communication from start to finish, while the 10-year structural warranty plus six months of aftercare underline a commitment to long-term quality. In short: you gain a single partner who designs, secures approvals, manages the build and stands behind the result — a superior choice for London homeowners who need local expertise, legal compliance and reliable timelines.
Real World Use Case
Imagine a North London family who want to extend their rear wall to create a bright, open-plan kitchen-dining area. Reltic Extend would design the space, submit and manage planning permission, assign a project manager to coordinate trades, and complete the build under the staged pricing plan — delivering a usable, well-built extension that increases living space and resale value. Smooth. On time.
Pricing
Stage-by-stage pricing with no hidden costs (specific prices not provided on the website).
Website: https://relticextend.co.uk
LCCL Construction – House Extensions
At a Glance
LCCL Construction offers a clear, professional design-and-build route for house extensions across London and Hertfordshire, backed by accreditation and a 10-year warranty. Their service suits homeowners who want a single point of contact from concept through construction, with instant online quotes and free consultations to speed initial decisions. Expect reliable compliance with industry standards, though smaller budgets may find the entry price less appealing. A solid, trustworthy option if you value guarantees and end-to-end project management.
Core Features
LCCL provides full design and build services covering single- and double-storey extensions, wrap-arounds, side returns, kitchen extensions and loft conversions, supported by licensed and insured operations. They advertise instant online quotes and free consultation bookings, and maintain a portfolio of before-and-after projects to demonstrate finished outcomes and architectural range. The company emphasises regulatory compliance and offers a 10-year structural warranty, which shifts long-term risk away from the homeowner.
Pros
- Comprehensive end-to-end service: LCCL handles everything from design to construction, which reduces the coordination burden on you and keeps responsibility with a single contractor.
- 10-year warranty on completed work: The long warranty provides real peace of mind and a tangible guarantee of workmanship and structural integrity.
- Free online instant quotes and consultations: You can get an immediate sense of likely costs and book an initial consultation without upfront fees, helping you decide quickly.
- Experienced, award-recognised team: Industry recognition (LABC regional winner 2024) signals quality and professional standards within the building community.
- Range of extension types and tailored solutions: Whether you need a rear extension, a loft conversion or a wrap-around, the service scope covers common homeowner requirements.
Cons
- Higher starting costs: Costs start from £15,000, which may be prohibitively high for very small or low-budget extensions.
- Coverage clarity may vary by location: Although they service London and Hertfordshire, you may need to confirm specific area eligibility if you live outside the listed districts.
- Planning and approval times can extend schedules: Because approvals depend on local planning requirements, projects may face potentially lengthy waiting periods before work can proceed.
Who It’s For
LCCL is aimed at homeowners and small-scale property developers in London and Hertfordshire who want a professional, accountable partner to manage all stages of an extension project. Choose them if you value an accredited team, a firm warranty, and convenience of a single contractor handling design, permissions and construction.
Unique Value Proposition
LCCL’s unique selling point is its combination of full design-and-build delivery with formal accreditation and a 10-year structural warranty, offering homeowners a clear, lower-risk path to extending their home without managing multiple contractors.
Real World Use Case
A family in Finchley commissions LCCL to deliver a ground-floor rear extension to enlarge kitchen and living space; LCCL produces designs, secures approvals, manages construction and hands over a modern, functional extension backed by a decade-long warranty.
Pricing
Starting at £15,000
Website: https://lcclconstruction.co.uk/house-extensions-builders
Simply Extend
At a Glance
Simply Extend specialises in bespoke home, kitchen and side-return extensions across London and Birmingham, offering end-to-end design, planning and build services. Their model emphasises fixed-price quotes, insurance-backed deposits and a 10-year warranty, which reduces financial uncertainty for homeowners. If you want a managed, full-service extension with a clear warranty, they’re a sensible option — though precise pricing and timelines aren’t spelled out in the provided information.
Core Features
Simply Extend provides tailored design and planning that adapts to your specific needs, then carries projects through to completion with dedicated project management. Key capabilities include bespoke designs for kitchen, rear, wrap-around and double-storey extensions, plus loft and basement conversions and garden rooms. The business promises fixed prices to avoid hidden costs, insurance-backed deposits and warranties to protect clients, and a single point of contact to coordinate planning permissions and construction milestones.
Pros
- Proven track record: Simply Extend has completed numerous projects, which suggests consistent delivery and experience across different extension types.
- Strong customer satisfaction: The company reports robust testimonials, indicating many homeowners are pleased with the finished work and service.
- Transparent pricing model: Offering fixed-price quotes helps prevent unexpected cost escalations during a project.
- Long warranty period: A 10-year warranty provides reassurance about structural quality and offers long-term peace of mind.
- Comprehensive service offering: From initial design to final construction, the full-suite approach makes it easier for homeowners to manage a complex build through one supplier.
Cons
- Limited pricing detail: The publicly provided information does not include specific price ranges or examples, which makes early budgeting difficult for homeowners.
- Unclear project timelines: There is no detailed information on typical project durations, so you may need to ask for typical schedules and lead times during enquiries.
- Regional availability questions: Services are described for London and Birmingham; availability elsewhere is not specified and may be limited.
- Sustainability details missing: Apart from a brief mention of carbon off-setting, detailed environmental and sustainability practices are not explained.
Who It’s For
Simply Extend suits London and Birmingham homeowners who want a hands-off, professionally managed extension project — families seeking more living or kitchen space, and property owners aiming to increase value with structural additions. If you prefer a single contractor to handle design, planning and construction under a fixed-price arrangement, this company fits that brief.
Unique Value Proposition
The company’s distinct offering is its combination of bespoke design, fixed-price assurance and insurance-backed warranties, all coordinated through dedicated project management. That mix reduces financial uncertainty and simplifies decision-making for homeowners who want a turnkey solution.
Real World Use Case
A London family needing a larger kitchen and open-plan living area commissions Simply Extend to design and build a rear and kitchen extension; the project is delivered under a fixed-price contract with a 10-year warranty, resulting in increased living comfort and higher property value.
Pricing
Quote-based: pricing details are not specified publicly, but the company advertises fixed-price quotes with no surprises.
Website: https://simplyextend.co.uk
Plus Rooms
At a Glance
Plus Rooms is a London and Surrey-based bespoke design-and-build firm that focuses on house extensions, managing projects from initial planning through to finishing touches. Their reputation rests on high standards and strong customer satisfaction, with over 60% of work coming from recommendations. If you want a hands-off, professionally managed extension that prioritises design and craftsmanship, Plus Rooms is a compelling option. Expect clear communication and detailed consultation, though you should plan to obtain a bespoke quote.
Core Features
Plus Rooms provides end-to-end bespoke house extension services: design and build for side, rear, wraparound and flat-roof extensions; full project management including planning permission and permitted development handling; detailed consultations that produce bespoke reports and schedules; and transformational interior reconfigurations. They emphasise modern, practical, and stylish outcomes and oversee the entire timeline so you don’t have to coordinate multiple contractors yourself.
Pros
- Experienced in a wide variety of extension types and designs, which helps when tailoring solutions to challenging London and Surrey properties.
- Full project management from start to finish, including planning permissions, so you avoid juggling approvals and contractors.
- High quality craftsmanship and attention to detail that show through in finished interiors and structural work.
- Strong customer satisfaction with numerous positive reviews and recommendations, indicating reliable delivery for many clients.
- Transparent communication and thorough estimations that help set realistic expectations before work begins.
Cons
- Pricing details are not specified publicly, so you will need to contact the company directly to obtain a tailored quote.
- Some projects have experienced overruns due to external factors such as materials sourcing delays during the pandemic, which can affect timelines.
- The complexity and scale of bespoke projects can lead to potential delays, so longer lead times should be expected for larger builds.
Who It’s For
Plus Rooms suits homeowners in London and Surrey who value a seamless, professionally managed extension process and want a bespoke result rather than an off-the-shelf solution. It is particularly well matched to families seeking additional living space or clients wanting transformational interior reconfiguration without the hassle of coordinating planning and construction themselves.
Unique Value Proposition
Plus Rooms stands out by combining bespoke design sensibilities with full-spectrum project management and a track record of client referrals. Their selling point is the guarantee of a single, accountable team handling design, permissions, and build — ideal for owners who prioritise quality finishes, clarity of communication, and a single point of contact across complex projects.
Real World Use Case
Imagine a family wanting to open up their cramped kitchen and extend into the garden to form an open-plan hub for daily life and entertaining; Plus Rooms would run the planning application, produce drawings and schedules, manage contractors, and deliver the finished space — leaving the family to move in and enjoy the new layout without micro-managing the build.
Pricing
Not specified; requires direct contact for a tailored quote.
Website: https://plusrooms.co.uk
Buildteam London
At a Glance
Buildteam London positions itself as a straightforward, full-service extension specialist for London homeowners, offering free 30-minute design consultations and virtual 3D tours to preview work before you commit. They claim a strong track record—trusted by over 1,600 homeowners—and provide complete project management from initial design through to build. The firm emphasises transparent pricing and backs structural work with a three-year guarantee, although specific price points are not listed. Bottom line: reliable for homeowners who value a managed process and visual reassurance, but expect to request a personalised quote.
Core Features
Buildteam’s core offering centres on end-to-end project management: a free 30-minute design consultation that starts the process, virtual open houses and 3D project tours that let you inspect previous builds remotely, and a transparent pricing approach intended to reduce surprises during delivery. They handle kitchen extensions, house extensions and loft conversions and support clients through design, planning and construction phases. The three-year structural guarantee provides a clear, short-term safety net for workmanship and stability.
Straight to the point.
Pros
- Professional, organised build management: Buildteam offers complete oversight from design to completion, which reduces the coordination burden on you and helps keep the programme on track.
- High-quality end products: The company’s emphasis on craftsmanship is reflected in its claim of consistent, quality finishes across kitchen, house and loft projects.
- Clear communication throughout projects: Virtual tours and consultations indicate a focus on keeping clients informed and engaged at each stage.
- Flexible consultation options: A free 30-minute consultation and virtual open houses make it easy to explore viability without commitment.
- Proven London experience: Being trusted by over 1,600 homeowners suggests familiarity with local planning nuances and typical London property types.
Cons
- Pricing details are not provided on the website: You will need to request a bespoke quote to understand costs, which can slow initial budgeting.
- Geographic focus limited to London in available information: If you live outside London you may find no clear indication of service areas or coverage.
- Limited information on timelines and post-completion support: The site does not specify typical project durations or detail long-term customer support beyond the three-year structural guarantee.
Who It’s For
Buildteam is best suited to London homeowners and families who want a single supplier to manage design, permissions and construction for a kitchen, house or loft extension. If you appreciate seeing work in immersive 3D before committing and prefer transparent communication rather than piecing together contractors yourself, this team fits well. If you need immediate cost figures online, this may feel slower.
Unique Value Proposition
Buildteam’s distinctive offer is the combination of hands-on, end-to-end project management with interactive virtual open houses and 3D tours—so you can see past work in detail before signing. The transparent-pricing promise and a three-year structural guarantee further position them as a pragmatic choice for homeowners seeking reassurance during renovation.
Real World Use Case
A London family planning a rear kitchen extension can book the free 30-minute consultation, view similar completed projects via a virtual tour to refine their design tastes, then hand the process to Buildteam for planning, build management and completion—minimising the time and stress of juggling multiple contractors.
Pricing
Not specified on the website.
Website: https://buildteam.com
The Market Design & Build
At a Glance
The Market Design & Build is presented as a full-service London specialist for home extensions, loft conversions and bespoke refurbishments. Its in-house team and end-to-end project management model make it a clear choice for homeowners who want a single point of responsibility from design through to completion. The company’s reputation is supported by over 700 positive reviews, signalling consistent client satisfaction. That said, practical details such as pricing and detailed timelines are not published openly, which may slow early-stage decision-making.
Core Features
The Market Design & Build offers end-to-end design and build services delivered by a professional, in-house team with expertise in bespoke projects. Services listed include roofing, loft conversions, home extensions, basements and complete refurbishments, with comprehensive project management from initial consultation to execution. The core proposition centres on managing all technical and regulatory steps internally, reducing the need for clients to coordinate multiple contractors.
Pros
- End-to-end responsibility: The company handles design, planning and build stages, which reduces the risk of miscommunication between separate contractors. This simplifies your schedule and reduces administrative friction.
- In-house professional team: Having a single team responsible for delivery increases continuity and accountability throughout the project lifecycle. It also helps preserve design intent from concept to completion.
- Strong client feedback: With over 700 positive reviews, there is clear evidence of customer satisfaction and repeat referral potential, which is a reliable indicator of quality and service standards.
- Bespoke project expertise: The focus on bespoke work means the firm is geared towards custom solutions rather than one-size-fits-all packages, which is important for period homes and constrained London sites.
- Wide service range: From loft conversions to full-house refurbishments, the breadth of services means you can consolidate multiple jobs under one contract.
Cons
- Limited pricing information: The website does not publish prices, which makes initial budgeting and quick comparisons difficult for homeowners who need transparent cost indications.
- Geographic focus unclear beyond London: The company is clearly London-focused, but details about availability in wider regions such as surrounding counties are not specified, which could affect those in outer suburbs or Surrey.
- No detailed project timelines provided: There is no standard timeline guidance on the site, leaving prospective clients uncertain about typical programme lengths and milestone expectations.
Who It’s For
This provider suits London homeowners seeking a single, professional partner to manage bespoke extensions, loft conversions or full refurbishments. If you value continuity, quality control and a streamlined client experience over having multiple subcontractors, this is a strong match.
Unique Value Proposition
The Market Design & Build promises consolidated design and build delivery through an experienced in-house team, backed by strong client feedback. The selling point is accountability: one company takes ownership of the whole project, reducing coordination headaches and preserving design quality.
Real World Use Case
Imagine a London homeowner wanting a loft conversion with an adjoining rear extension. The Market Design & Build would take the brief, produce designs, secure approvals where required and manage construction, delivering a single contracted solution from planning to practical completion.
Pricing
Not specified on the website
Website: https://themarketdesignbuild.com
Home Extension Services Comparison
Here’s a comparison table summarizing key features, pros, cons, pricing, and usability of different home extension services in London and surrounding areas.
| Company | Key Features | Pros | Cons | Pricing |
|---|---|---|---|---|
| Reltic Extend | Bespoke extensions, full planning-permission support, durable construction | Strong referrals, transparent pricing, 10-year warranty, dedicated project management | Limited price details | Stage-by-stage pricing |
| LCCL Construction | Design and build, instant online quotes, wide range of extensions, 10-year warranty | End-to-end service, free quotes, experienced team, extensive range of solutions | Higher starting costs, location coverage varies | Starting at £15,000 |
| Simply Extend | Fixed-price quotes, insurance-backed deposits, wide service range including loft conversions | Proven track record, strong customer satisfaction, transparent pricing, long warranty | Limited pricing and timeline info, regional availability unclear | Quote-based |
| Plus Rooms | End-to-end bespoke services, detailed consultations, strong customer satisfaction | Experienced in variety of designs, full project management, high-quality craftsmanship | Pricing not specified, potential project overruns | Not specified |
| Buildteam London | Full project management, virtual 3D tours, free consultation | Professional management, high-quality outcomes, clear communications, proven London experience | Specific pricing and timeline details not provided, limited to London | Not specified |
| The Market Design & Build | In-house team, bespoke project expertise, wide service range | End-to-end responsibility, strong client feedback, bespoke work expertise | Pricing and timeline details not specified, geographic focus unclear | Not specified |
Find Your Perfect Kitchen Extension Partner Today
Choosing the best kitchen extension builder can feel overwhelming with so many options and key factors to consider. This article highlights the challenges many homeowners face such as unclear pricing, juggling multiple contractors, and navigating complex planning permissions. If you want to avoid delays, unexpected costs, or the stress of managing your build alone, it is essential to work with a trusted specialist who offers transparency and end-to-end project management.
At Reltic Extend, we understand that your kitchen extension is not just about adding space but about creating a modern, stylish living environment tailored to your lifestyle. With over 20 years of experience serving London and Surrey, we provide clear stage-by-stage pricing, handle all planning permissions on your behalf, and assign a dedicated project manager to keep your project on track. Explore practical advice in our Design & Build Tips for Home Extensions | Reltic Extend and gather creative ideas in Types of Home Extensions & Ideas | Reltic Extend to inspire your vision.
Ready to take the next step towards your dream kitchen extension with complete peace of mind? Contact us today at Reltic Extend. Our team is here to guide you through the process from initial design to final completion quickly and professionally.
Frequently Asked Questions
What should I consider when choosing the best kitchen extension builders for 2025?
Choosing the best kitchen extension builders involves evaluating their portfolio, checking customer reviews, and assessing their project management practices. Start by reviewing their previous projects to ensure their style aligns with your vision, and read client testimonials to gauge overall satisfaction.
How do I compare pricing for kitchen extension builders effectively?
To compare pricing for kitchen extension builders, request detailed quotes that outline costs for materials, labor, and project timelines. Ensure each quote follows a similar structure to make side-by-side comparisons easier, focusing on transparency to identify any hidden costs.
What is the typical timeline for a kitchen extension project?
A kitchen extension project typically ranges from three to six months, depending on its complexity and the builder’s schedule. Ask potential builders about their estimated completion times and maintain regular communication to track progress throughout the project.
How can I ensure my kitchen extension complies with local building regulations?
To ensure compliance with local building regulations, enlist builders who provide full project management, including handling all necessary planning permissions. Confirm that they are familiar with the requirements in your area and that they will manage all necessary documentation throughout the build process.
What warranties should I expect from kitchen extension builders?
You should expect kitchen extension builders to provide warranties that cover both structural integrity and workmanship, ideally lasting at least ten years. Verify what the warranty covers and any limitations, ensuring you have protection against potential issues after the project is completed.
How can I communicate my design ideas effectively to my chosen builder?
Communicate your design ideas effectively by preparing visual aids such as inspiration boards or sketches that illustrate your vision. Start this conversation early in the process to ensure that your designer understands your preferences and integrates them into the project plan.
