
House Extension
KITCHEN & HOUSE EXTENSIONS LONDON
Design & Build LONDON is London’s leading side infill, rear and wrap around kitchen extension company. We successfully completed bespoke house extension projects to achieve extra space and breathe new life in to your home in London; Our thorough tailor-made service combines planning, Architectural design stage through full construction.
We will help you PLAN, DESIGN and BUILD your house extension project!
WHAT WE DO : AWARD WINNING KITCHEN EXTENSION DESIGNS

Capturing your vision
We apply innovative architectural design solutions to building projects to develop a concept design, sketching layout of your house extension and options to explore the potential of the property. We are prepared to spend as long as you require on this process, to ensure that all issues and alternatives are considered.

Bringing your ideas to life
Our creative Architectural & Interior designers will begin producing concept designs and sketches. This is a collaborative process where we work closely with you to develop ideas into a final set of plans for the kitchen extension build phase. You can also hand-pick materials, fixtures and fittings with guidance from our experts.

Construction and sign-off
You can look forward to the final result as the build teams begin construction under the orchestration of your personal Project Manager. The detailed program will ensure that the right people, tools and materials will be on-site at the right times for a seamless build.
Meet With Us
At the early stages of enquiry about your house extension project, most questions we receive are about feasibility and cost. We respond to this need by booking a free design consultation with a member of our Architectural Team. This consultation typically takes around 20- 30mins and following the meeting we will send you a tailored, fixed fee Design Proposal, along with an outline quotation for the works. If you prefer, we can also arrange a site visit to your home, and with our Premium visit the fee is refundable in full should you instruct us within 30 days of the visit.
Delivering High-Quality Projects on Brief, On Time and Within Budget.
We offer a wide range of build and refurbishment services and enjoy working on different project types and sizes. We construct new buildings, alter, refurbish, and remodel existing buildings, undertake basement excavations, loft conversions, and extensions and transform interior spaces.
Kitchen Extensions London with DBL
Design & Build London is London’s leading house, kitchen and side return extension company. We design, manage and build a wide variety of bespoke extension projects; we offer services to extend your living space, with maybe a bigger kitchen, an extra bedroom, or simply a renovation to create more living space for your growing family. Whether it is with a rear home extension or a wrap-around kitchen extension, we will maximise the space in your home.
Kitchen & House Extension Company
Design & Build London team can provide you with the extension in London that you desire, Our industry leading experience in quality builds is recognised throughout South West and Central London. Our in-house architectural designers and builders can not only enhance the beauty of your existing home – a quality rear extension will also add value to your property.
A home extension project within your budget will meet your need for extra living space, as well as enhancing the appearance of your home. Our home remodelling experts at Design & Build London are able to deliver a seamless transition from your property in London as it currently is, to the larger and more spacious home that you desire – and all within the contracted time frame, working with you throughout the process.
We would be happy to provide you with a free estimate, and then get started on your house extension – we are ready when you are!
Share your ideas with us, and we can make them become a reality.
The Strand WC2 0NR – Full Renovation
Full house renovation provided by Design & Build London Arguably the finest property renovations in…
Kensington Court Renovation
Full strip out of: Joinery, flooring, electrics, kitchen Install new floors with sound proof insulation…
Full House Renovation Kensington
Full House Renovation in Courtfield Road, Kensington SW7 4DA.
Full Renovation in Camden NW1 7EP
Design & Build London have just completed the full house renovation on this stunning property…
Muswell Hill Loft Extension N10 3AG (in progress)
Loft conversion currently underway in Muswell Hill N10 3AG
Why Choose Design & Build London?
Transparency
We believe that the key to a strong working relationship is transparency. That is why we produce a full schedule of works that breaks down the project into simple weekly targets that correlate to payments, making it clear what to expect.
Liaison
It is vital to the success of a project that we have a clear channel of communication with our clients. A Project Co-ordinator will be assigned to you when the first draft plans are produced and will work with you right through to the completion of the building works. They will be your main point of contact throughout the process.
Carefully managed
We have worked hard to build a strong work force that represents Design & Build London in the best possible light. Our Project Co-ordinators are articulate, organised and approachable, whilst our site foremen are experienced and reliable. In order to attract and retain the very best workmen we make sure we give them the training and tools they need.
First-class Service
Residential building work requires a high level of attention to detail. Creating a great structure isn’t enough, its the cosmetic elements that everybody looks at and talks about, we take pride in the plastering, brickwork, rendering and roofing so that our product has a distinct feel that is reflected across all of our projects.
Recommendations
We are a small business that relies on recommendations; we don’t just want our customers to walk away satisfied, we want them to actively tell their friends and family about the positive experience they have had with us. We always sit down with our customers at the end of each project to ask for feedback as we constantly strive to improve.
We are Your partner
More than 30 years’ experience underpins our reliable and detailed approach to every project. Our proficient team provides efficient project management while adding value at every stage of the process from design to completion.
Architectural Design Bundles
Whether you need some planning feasibility advice or a full Building Control drawing set, we offer a variety of Design Packages which can be adapted to suit you. You can commit to everything from the very beginning, or build your package as you go.
Extension Builders London
Free Consultation
- What’s included?
- Discussion about the project brief,
- Design fee proposal
- Build Quotation (Ballpark figure or detailed quotation)
Architectural Design – £125+VAT
- What’s included?
- Discussion about the project brief,
- Design fee proposal
- Build Quotation (Ballpark figure or detailed quotation)
- On site survey of proposed floor area
- Cost advice and optimising your budget
- Specialist planning advice
- Party Wall advice and guidance
*£125 + VAT fully refundable within 30 days on Design instruction
Concept – £200+VAT
What’s included?
- Discussion about the project brief,
- Design fee proposal
- Build Quotation (Ballpark figure or detailed quotation)
- On site survey of proposed floor area
- Cost advice and optimising your budget
- Specialist planning advice
- Party Wall advice and guidance
- Creative design ideas
- Follow up meeting & plans
*£200 + VAT fully refundable within 30 days on Design instruction
Pre-Planning Advice
Explore feasibility options via your local council
What’s included?
- Expert advice on planning
- Drawings and design development
- Preparation in advance of attending the Pre-planning Application meeting
Ground Floor Extension – £795
Ground Floor Extension & Loft Conversion –from £995
Loft Conversion – from £895
Ground Floor & First Floor Extension –from £995
Something Else? Contact us for a quote
Design & Planning
Finalise your design and obtain planning consent
What’s included?
- Discussion about the project brief
- Drawing amendments
- Planning advice and submission of application
- Cost advice and optimising your budget
- Party Wall advice and guidance
Ground Floor Extension – from £1,595
Ground Floor Extension & Loft Conversion –from £1,995
Loft Conversion – from £1,595
Ground Floor & First Floor Extension –from £1,995
Something Else? Contact us for a quote
Ready to Build
Get ready to build with planning submission, building regs pack and full structural engineering.
What’s included?
- Full measured survey
- Drawing amendments
- Planning advice and submission of application
- Full Building Reg. Pack
- Structural calculations
- Detailed schedule of works
- Party Wall advice and guidance
- Creative design ideas
- Follow up meeting & plans
Ground Floor Extension – from £3,995
Ground Floor Extension & Loft Conversion –from £4,995
Loft Conversion – from £3,495
Ground Floor & First Floor Extension –from £4,995
HOW MUCH DOES AN HOUSE or KITCHEN EXTENSION COST TO BUILD?
Small Side Return Extension
Roof Form: Flat Roof
ESTIMATED BUILD COST: £55000
Small Side Return Extension
Roof Form: Pitched Roof
ESTIMATED BUILD COST: £60000
Medium Side Return Extension
Roof Form: Pitched Roof
ESTIMATED BUILD COST: £75000
Large Rear Extension
Roof Form: Pitched
ESTIMATED BUILD COST: £75000
Large Side Return Extension
Roof Form: Flat
ESTIMATED BUILD COST: £85000
Large Wrap Around Extension
Roof Form: Pitched, Flat, Gable, Crown
ESTIMATED BUILD COST: £105000
Small 3m x 3m Rear Extension
Roof Form: Flat Roof
ESTIMATED BUILD COST: £55000
Medium Rear Extension
Roof Form: Flat Roof
ESTIMATED BUILD COST: £70000
Medium Side Return Extension
Roof Form: Flat Roof
ESTIMATED BUILD COST: £70000
Large Side Return Extension
Roof Form: Pitched
ESTIMATED BUILD COST: £85000
Small Wrap Around Extension
Roof Form: Pitched, Flat, Gable, Crown
ESTIMATED BUILD COST: £80000
Medium Wrap Around Extension
Roof Form: Pitched, Flat, Gable, Crown
ESTIMATED BUILD COST: £95000
This is a measure of both the loyalty of our customers and the likelihood of them recommending us to others.
This is a measure of how many of our customers come back and use our services again.
This expresses the proportion of our business that results from referrals from previous clients.
- Interior Design service for your home
- Advising on styles, materials, feasibility
- Producing detailed plans and 3D images
- Fittings, furnishings, colours and lighting
- Maximising best features of your property
- Project Concept, Design and Planning
- Preparing schedules of work, finishes & timelines
- Design and Build team under one roof
- Problem-solving and troubleshooting
- Full House Renovation, Kitchen Renovation
- House Extensions, Lofts, Basements
- Structural & Architectural glass
- Traditional, steel or concrete frame
- Stone fitting of slab and tiles