Extension Builders in Mortlake

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (17 reviews)

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Some of our top rated extension builders in Mortlake

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Civiltech
No reviews yet
Extension Builder in Mortlake
We pride ourselves for delivering work collaboratively to a high standard, in the agreed time frame and budget with full transparency and safely.
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Blueprint Developments Limited
Rating: 4.2 out of 5
Extension Builder in Mortlake
Welcome to Blueprint Builders, where your dream space becomes a reality. Nestled in the heart of London, our team is at the forefront of design and construction innovation. We specialize in transforming spaces into luxurious living experiences, with services that include: - Elegant House Extensions - Meticulous Loft Conversions - Comprehensive Renovations - Bespoke New Builds And a wide spectrum of commercial and domestic building projects designed with your luxury and comfort in mind. At Blueprint Builders, your satisfaction is not just a goal—it's our promise. We're dedicated to bringing smiles to our clients faces through meticulous attention to detail, unparalleled craftsmanship, and a seamless client experience from start to finish. Stay connected with our journey of transformation on Instagram @blueprintbuilder. Follow us for a regular dose of inspiration through updated photos of our latest projects. Dreaming of a space makeover? Don't wait any longer. Contact us today for a complimentary site visit and a personalized quote. Let's make your vision a living, breathing reality.
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Latest review:
Extensions- 19 Aug 2026
We paid for the build finished in Sept. 2025. Our concern is the foundations. The drawings specified about 1.8m depth and anti-heave boards due to clay and trees. The builder had not properly checked the drawings, then charged substantial extra for the depth. We paid, but the boards were not installed, and our photos and videos appear to show much of the foundation at about 1m. A replacement Building Controller declined to proceed without evidence of the boards. The patio, including £1,700 extension, was laid without proper excavation or a mechanically compacted base. Some tiles are loose and render is failing. Other faults include uneven floors and walls, falling plaster, catching doors, cladding gaps, poor electrical fitting, missing vents, a possible leak and unfinished items. Attendance was intermittent—about three weeks over two months—and the work felt rushed around other jobs. Our neighbour witnessed two workers urinating behind the shed. We cannot recommend this company...
Sweet Home Construction
Rating: 4.4 out of 5
Extension Builder in Mortlake
We are professionals in extensions (side double story, rear single story, side and rear single story and loft conversion. We also deal with refurbishing the whole house as per requirements of the customer.
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Latest review:
Extensions- 2 Oct 2018
Completed Side extension and 6m rear extension last Oct. Overall happy with the work. Digging, foundation, Bricks, structure, insulation, Roofing, Tiles, plumbing, flooring, painting, etc were done to good standard. Some of the minor corrections, changes or fixes needed near completion were done accordingly. Quote was in midrange and reasonable compared to compared to some others I received. Raman is very easy to work with and clear in his communication. Never had any issues all through construction through to finalising stages. Would recommend Raman to others.
Premium Build Limited
Rating: 4 out of 5
Extension Builder in Mortlake
Premium Build Limited is a West London-based construction firm specializing in conversions, extensions, and refurbishments. With years of experience, our team delivers high-quality craftsmanship and personalized service, transforming your vision into reality. We handle every aspect of your project, from initial design to final build, ensuring seamless integration with your existing space. Serving West London and surrounding areas, we are committed to enhancing your property’s value and functionality.
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Latest review:
Insulation- 4 May 2026
Efficient, professional, and cost effective. Very good communication and I felt I could trust them. They did EPC for me. Will highly recommend.
De Winter’s Property Services LTD
Rating: 3 out of 5
Extension Builder in Mortlake
Welcome to De Winter’s Property Services LTD – we proudly cover all aspects of work, both domestic and commercial. Whether it’s your home or business, our experienced team delivers high-quality, reliable solutions tailored to your needs. I’m Aidan De Winter, director of De Winter’s Property Services. I’ve been a fully qualified plumbing and heating engineer since 2014, with extensive experience across domestic and commercial sectors. Over the years, I’ve built strong knowledge in many areas of the construction industry and a trusted team of skilled tradespeople around me. Based in South London, we’re happy to take on jobs across all of London and beyond. Why choose us? With a reputation for quality, honesty, and reliability, we deliver every job to the highest standard—on time and within budget. No job is too big or too small, and we treat every project with the care it deserves.
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Latest review:
Plumbing- 24 Jan 2026
I did hire Aiden De Winter for the job. He came and inspected the problem and sent us a link to purchase a new pump. I paid him for this work. We purchased a new pump, and he decided not to finish the job and come back to install the pump. This caused a lot of problems as he was the second plumber I hired for this job, and now we have to find a third plumber! What a waste.. how hard is it to come back and fit the pump! Do not use this company at all costs!
Distinct Ltd
Rating: 5 out of 5
Extension Builder in Mortlake
Distinct lawn solutions are a lawn specialist company who provide a first class service. Hard work, trust and professionalism are main aims. We can turn any garden into a wonderful landscape. Work is finished to a guaranteed high standard. We have a great, ever growing online portfolio to view.
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Latest review:
Landscaping- 14 Dec 2014
Great job by Jordan. All was done on time without compromise on quality. Thank you
SP Builders
Rating: 4.8 out of 5
Extension Builder in Mortlake
Welcome to SP Builders, a family-run builder with over 40 years' experience. Undertaking all aspects of building work, refurbishment, lofts, extensions, paving, guttering, carpentry and plastering etc. We aim to make the process from conception to completion as pleasurable and rewarding as possible. We know how important it is to trust a builder when employing them to work in your home. We endeavour to answer your questions and give you the information you need to make the right decisions.
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Latest review:
Extensions- 16 Sep 2025
Steve and his crew did an amazing job turning my fag-packet designs and downloaded images into a proper, wonderful sound proof garden building, concrete external & rockwool cavity He’s a an old-school builder who does things the right way. His approach and mentality are always “how are we going to do this” rather than “I can’t do this,” I picked Steve on price and previous work. He came in middle price wise and was fair, it’s safe to say it was the right choice. He was left to his own devices, worked through all sorts of weather, and although the job took a little longer than expected because of that, he stuck firmly to his original quote. Although steve didn't know at the time, the garden room was my test for both quality, work ethic and trust, and Steve passed with flying colours. On the back of this, I’ve now commissioned him to build me a two-storey extension. I think I’ll buy him his own coffee machine for that project though! ;-) Thank you, Steve
Uk property solutions (ups) ltd
No reviews yet
Extension Builder in Mortlake
Hello. I have been in the building industry for over thirty years. I’m a competent professional and cover all aspects of the industry. Please don’t hesitate to contact me for professional advise quotations ect.
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G S Construction
Rating: 5 out of 5
Extension Builder in Mortlake
We undertake all types of building construction work, such as bathroom and kitchen fitting, electrical work, bricklaying and repointing, carpentry, central heating, all extensions, loft conversion, demolition and clearance, driveways, and fencing. installing and fitting kitchens, removing existing units and measuring for new ones, building base units, wall units and cupboards, fitting cornices, pelmets, plinths and worktops, tiling walls and floors, and carpentry.
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Latest review:
Extensions- 3 Feb 2024
Custom design and build of a upvc porch. Gurjant and his team were prompt and courteous. The work was completed in 2 days to a high standard. Highly recommended.
Steve Howell man with a trowel builder, property maintainance ,handyman
Rating: 4.9 out of 5
Extension Builder in Mortlake
Hi my name is Steve and i am a bricklayer by trade. I have done a 4 year apprenticeship in city and guilds so i am fully qualified I have 35 yrs experience I have a great sence of houmour and easy to work with, thats Steve howell man with a trowel I take on a small extension work and project manager the hole thing from start to finish Also small jobs fencing, gutter repairs, plastering etc I will also do the handyman jobs as well Hope this helps
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Latest review:
Extensions- 22 Feb 2019
I am so happy with Steve's work. He has been kind and extremely helpful in working with building regs and making sure everything was done to my speciations. A real joy to work with and has produced a fantastic bathroom extension at a reasonable price. I would employ him again any time and would encourage others to do the same. Thankyou Steve. I can't say enough about him.
Ionut negru
Rating: 5 out of 5
Extension Builder in Mortlake
Hi. My name is Ionut Negru and I am a skilled worker in the field of painters and decorators, tiles, laminate flooring and besides that i also do a same things related to plumbing, electrical and carpentry. I am a person who wants to make the customer satisfied and happy. I always offer good prices end high quality Thank you for your cooperation.
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Latest review:
Bathroom Fitting- 17 Dec 2025
Jonny installed a new bathroom for us and this was done to a very high standard. He was very professional, punctual and polite and talked us through areas of the project which we weren't too sure how to proceed with. I would definitely use Johnny again and would highly recommend him.
NICER LTD
No reviews yet
Extension Builder in Mortlake
We are a reliable and professional Chinese building team based in London, specialising in residential renovation and property improvement work. Although we are new to MyBuilder and do not yet have reviews on the platform, we have completed a wide range of projects for homeowners and landlords across London. We are happy to arrange viewings of previous completed work for peace of mind. We understand that good communication, reliability, and keeping to budget are just as important as the quality of the work itself. We take pride in being: • Punctual and hardworking • Clean and respectful in customers’ homes • Transparent with pricing and quotations • Efficient without cutting corners • Focused on delivering a professional finish We cover all aspects of home improvement, including bathrooms, kitchens, flooring, decorating, carpentry, and general building work. Our aim is simple — to provide dependable workmanship at a fair price and make the process as smooth and stress-free as possible for every customer.
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Good Choice Builders LTD
Rating: 5 out of 5
Extension Builder in Mortlake
We are the building company that specialized in Loft Conversions, Extensions and Refurbishments. By this moment we worked as a subcontractors, now we have all neccessary and feel free to participate to the tenders, prepare the informative and detailed contracts and estimations, management.
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Latest review:
Extensions- 8 Jul 2019
A very efficient builder who did the plans which where passed first time when we needed help he found someone to help very clean and tidy and on time
BS construction
Rating: 5 out of 5
Extension Builder in Mortlake
Hi, I’m brar I’m working from last 8 years I’m construction field I’m expert in whole building work special extension, roofing, pvc window door glass, flooring, paints etc. thanks.
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Latest review:
Windows & Doors (uPVC & Metal)- 3 Feb 2025
The job was done professionally and we are happy. I would recommend BS construction
Crystal Core Limited
Rating: 5 out of 5
Extension Builder in Mortlake
Welcome to Crystal Core Construction At Crystal Core Construction, we provide high-quality building and renovation services across London. With over 7 years of industry experience, we take pride in delivering reliable workmanship, honest advice, and excellent customer service. Our Services House Extensions Loft Conversions Full Property Renovations Kitchens & Bathrooms Plumbing & Electrical Work Tiling & Flooring Painting & Decorating Brickwork & Plastering Fencing,Paving, Patios & Landscaping Why Choose Us? ✔ Over 7 years of professional experience ✔ Fully registered and verified company ✔ Free, no-obligation quotations ✔ High-quality workmanship with attention to detail ✔ Honest pricing with no hidden costs ✔ Projects completed on time and to a high standard Whether you're planning a small home improvement or a complete renovation, we're committed to delivering quality work and a smooth, stress-free experience. All-in-One Solution: From the first brick to the final coat of paint, we manage the entire project so you do not have to juggle multiple contractors. Contact Crystal Core Construction today for a free quotation. We look forward to helping bring your project to life.
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Latest review:
Fencing- 19 Aug 2026
The work is still ongoing but the team are fabulous. So accommodating and hard working. I would highly recommend them
DF Construction
Rating: 5 out of 5
Extension Builder in Mortlake
DFGC are commercial and residential refurbishment specialists. We've created partnerships with high profile companies to complete large scale projects, in the South East of England - shown on my profile. We are known for a wide range of undertakings, from complete refurbishments, extensions, bathrooms, driveways, to name a few. There's very little we can't do, with regards to construction. We're a one stop shop for all your construction needs - we can take your vision and make it a reality.
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Latest review:
Extensions- 13 Dec 2021
Couldn't recommend Domi & Emile enough. They have great building knowledge and kept us informed and up to date throughout the whole building process. The job was finished to a high standard and they even came back free of charge to tie up a few snags a few weeks later. Great builders and a great team!

4.1

Top rated Extension Builders

Our Extension Builders in Mortlake, are rated 4.1 out of 5 based on 17 reviews from customers like you.

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What types of services are offered by local extension builders in Mortlake?

Building an extension is a major milestone for any home. It’s not just about adding extra space, it’s a big step that can transform how you live day to day, opening up new possibilities for comfort, lifestyle, and family needs.

This is why it’s so important to find the right extension builders in Mortlake for you. They can help with a variety of tasks and projects, including:

Extending your home with an extra room
Two+ storey extensions
Adding partition walls to create more rooms
Building annexes or external structures

To find the right extension builder near you, simply post your job on MyBuilder. Explain the type of help you’re looking for, and then home extension builders in Mortlake who are available and interested can respond to your post.

Browse profiles, read customer reviews and get quotes from your chosen Mortlake extension builders, all before you decide who to hire.

What are the hourly rates of extension builders in Mortlake?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Mortlake will charge between £16 and £42 per hour.

Single-storey rear extensions cost between £20,000 and £60,000 depending on size and finish.
The cost of double-storey extensions, which add more space and value, can range from £100,000 to over £170,000.
Larger wrap-around extensions that combine multiple extension types can range from £40,000 to over £120,000.

The cost of an extension will vary depending on your property. For instance, extending in certain areas may require structural adjustments to ensure stability, which can increase your material and labour costs.

To get an accurate price for your home extension, request detailed quotes from several Mortlake extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Mortlake home extension project is likely to cost.

Find extension builders in Mortlake with MyBuilder

Hiring the right extension builder in Mortlake with MyBuilder couldn’t be easier. Just follow these simple steps:

Step 1: Post your extension project on MyBuilder

Whether you’re planning a single-storey extension, a loft conversion, or adding a new room, post your job on MyBuilder to find local Mortlake extension builders. Once your job is live, we’ll share it with home extension builders in Mortlake who can express their interest.

Step 2: Compare different extension builders in Mortlake

When you start receiving interest, review profiles of local Mortlake extension builders, check their previous work, and read real customer reviews. Ask about timelines, materials, and request detailed quotes.

Step 3: Hire Mortlake extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Mortlake, compare their experience, guarantees, and costs before choosing who to hire.

You’ll also have confidence knowing that every tradesperson on MyBuilder is verified through several checks, including:

ID verification: When a tradesperson joins MyBuilder, we ask for a valid ID, such as a passport, ID card, or eIDAS certificate.
Company verification: For tradespeople operating under a company, we make sure every tradesperson has a registered business.

Did you know? Our continuous monitoring and complaints process ensures that tradespeople who don’t meet our standards are promptly removed from MyBuilder’s platform.

Mortlake extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Mortlake extension builder before hiring?

Before hiring an extension builder in Mortlake or extension building company in Mortlake, ask a few key questions to make sure you’re choosing the right professional for your home extension project.

What qualifications and experience do you have as an extension builder in Mortlake?

An extension builder in Mortlake should have a strong track record with similar projects and relevant building qualifications or trade memberships, such as the Federation of Master Builders (FMB) or TrustMark.

Will my home extension meet all building regulations and planning requirements?

Your Mortlake extension builder should ensure the project complies with Building Regulations and, where necessary, handle or assist with planning permissions. Ask how they manage building control inspections and what documentation you’ll receive once the project is complete.

What experience do you have with similar extensions in Mortlake?

Ask to see examples of their previous work, or view examples of their work on MyBuilder. Ideally projects similar to yours in scale and design. This helps you assess the Mortlake extension builder’s ability to deliver a result that meets your expectations.

How long will the extension take to complete?

Extension project timelines can vary depending on size, complexity, and weather. A typical single-storey extension might take around 8 - 12 weeks. Request a detailed schedule so you know what to expect and when key milestones will be reached.

Do you offer a guarantee for your work? Most Mortlake extension builders offer a guarantee or warranty on their work, often between 1 and 10 years depending on the project and materials used. This gives you assurance that any issues will be resolved after completion.

If you still have questions about the professional you are looking to hire, we have a full detailed guide on hiring the right builder here.

FAQ: Common questions about home extensions in Mortlake

Can an extension builder in Mortlake help with planning permission?

Yes, many extension builders in Mortlake can guide you through the planning process. They can help prepare drawings, advise on local requirements, and liaise with your local council to ensure your project meets all necessary regulations.

Can an extension builder in Mortlake handle everything from design to construction?

Many Mortlake extension builders offer full design-and-build services, managing both the architectural planning and construction stages. Ask your builder whether they can provide a complete package or if you’ll need to hire an architect or designer separately.

Will an extension builder in Mortlake help with materials and finishes?

Yes, most extension builders in Mortlake can source materials and offer advice on finishes that suit your design and budget. You can also choose to supply certain materials yourself, just make sure this is agreed upon before work starts.