Extension Builders in New Malden

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.3 (23 reviews)

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Some of our top rated extension builders in New Malden

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Jwolfconstruction ltd
Rating: 5 out of 5
Extension Builder in New Malden
My name is George and I'm running J Wolf Construction building company. I can provide a lot references from happy customers in sw London.
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Latest review:
Extensions- 26 Nov 2019
Great on delivery, good on project management....rate them very high on integrity and transparency
Joseph Riley Property Services
Rating: 5 out of 5
Extension Builder in New Malden
I've been working for 15 years now, I started as a bricklayer but soon was plastering, landscaping and all aspects of building work. we mainly do extensions and refurbishments. We also do hard landscaping and design I also went to college for city and guilds whilst doing an apprenticeship for a large design and build company, we're a family run small business who like to keep the customers happy.
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Latest review:
Landscaping- 18 May 2021
Joe was professional and responsive for my posted job to do fencing and wood trim repairs. He was able to provide a quote quickly and did the work in quick fashion. I wasn't quite sure what was feasible, but Joe was able to provide good guidance on what could be done for the repairs. The quality of the workmanship seems to be high, and I am pleased with the result. I would definitely recommend Joe for this type of work.
Revolutionary Spaces Ltd.
Rating: 4.3 out of 5
Extension Builder in New Malden
We are a famiy run building firm who specialise in basements & extensions,loft conversions,renovations and refurbishments and also bespoke kitchen and bathroom fitting.Combined we have over 45 years experience with me personally having 19 years as a Carpenter and Joiner.We also specialise in Roofing works. Flat roofs, pitched roofs. Dormers,mansards. Asphalt and specialist lead work. We also have specialist heritage joinery and roofing experts with appropriate heritage qualifications.
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Latest review:
Extensions- 10 Nov 2020
An outstanding team who clearly take pride in their work, it is the little things they think of that make a massive difference. We kept progress notes and any issue discussed and resolved proactively. Carried out some additional work that wasn’t initially quoted and did not charge extra. Shane himself has a fantastic desire to work and deliver. Even through the Covid, with most shops closed, Shane delivered. Would not hesitate to recommend.
LJS construction
Rating: 5 out of 5
Extension Builder in New Malden
Extensions, lofts, kitchens, refurbishment, driveways and patios
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Latest review:
Landscaping- 6 Jun 2023
We are so happy with our new patio and garden. They were on time, very helpful and did a fantastic job, for a very competitive price. We will definitely use LJS for any future projects.
ELGashi
Rating: 5 out of 5
Extension Builder in New Malden
LEON Building Construction LTD operates in the South-West London area, delivering high-quality construction and renovation services with a strong focus on professionalism and client satisfaction. We are committed to understanding each client's needs and carrying out every project with care and precision. Our company is divided into two divisions: - Main Works – including extensions and loft conversions - Small Works – covering full or partial home renovations Our services include: - House Extensions & Loft Conversions - Kitchen & Bathroom Renovations - Plumbing & Electrical Installations - Carpentry - Painting and Decoration From minor home maintenance to full property transformations, we offer reliable, functional, and aesthetically pleasing solutions. -Get in touch today and experience the advantage of working with a team that cares about every detail.
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Latest review:
Handyman- 6 Oct 2025
Excellent communication and even better work. I would recommend them for whatever job you have. Excellent work.
Bolshoi Developments Ltd
Rating: 5 out of 5
Extension Builder in New Malden
Company specialized in the residential space going from rear extension and loft conversions to full refurbishments and new builds
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Latest review:
Plumbing- 18 Dec 2021
Thomas' team was amazing. They found the leak and repaired the roof perfectly. We are happy with the work accomplished. For our next loft extension we will hire them again.
Edi A Construction Limited
Rating: 5 out of 5
Extension Builder in New Malden
Hi i’m Eddie i have been in the building trade for over ten years. I have a big team of staff covering small to large jobs which are available at short notice. I am a dedicated tradesman who values my customers and ensure I meet your expectations providing a very high standard of work. My team will commit to your job alone at one given time, tailoring our work to suit your needs. Photos of the work you require are available on request and I am happy to provide quotes at no obligation.
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Latest review:
Demolition- 28 Aug 2024
A clean tidy demolition with the minimum of disruption
Mentor
Rating: 4.9 out of 5
Extension Builder in New Malden
Mentor Builders is a London-based, family-operated construction and refurbishment company, established with a commitment to delivering high-quality craftsmanship, transparent service, and consistent client satisfaction. Operating as a sole trader, the business is led by a qualified electrician with over a decade of hands-on industry experience and a passion for building spaces that combine functionality, safety, and aesthetic value. Founded on the values of honesty, reliability, and attention to detail, Mentor Builders has steadily grown through word-of-mouth referrals and repeat business. Our portfolio spans residential, commercial, and public-sector projects across Greater London and surrounding areas, including high-stakes environments like NHS facilities where precision, discretion, and regulatory compliance are paramount. Mentor Builders is proud to be a family-run business with a tightly integrated team of three core professionals, each with dedicated expertise in one of the following disciplines: • Electrical Installations & Safety Compliance • Plumbing Systems (residential and commercial) • General Refurbishment, Fit-outs, and Interior Renovations Our multi-trade structure enables us to offer a holistic service model to clients, removing the need for subcontractor management and ensuring full control over quality, timelines, and client communication throughout the project.
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Latest review:
Conversions - General- 20 Feb 2026
Well organized, good attention to details and taking pride in achieving good quality. Working to architects details and happy to do mockups to validate them is just part of the work. Mentor and his teams are highly recommended
Wisebuild Construction Ltd
Rating: 5 out of 5
Extension Builder in New Malden
Hi, I've been in construction for 25 years, building many extensions, basements, loft conversions, new builds and many refurbishments. We carry out all aspects of the building process, including electrical wiring, plumbing, bathroom fit outs, carpentry, cabinetry, tiling, kitchen fitting and decoration.
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Latest review:
Restoration & Refurbishment- 13 May 2026
Paul was highly professional throughout the engagement. He provided clear, practical advice and took the time to thoroughly assess our needs during the consultation. He was also very responsive and proactive in following up on any questions we had afterwards, which we really appreciated. Overall, a great experience working with him.
Meshi
Rating: 5 out of 5
Extension Builder in New Malden
Meshi Finesse
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Latest review:
Handyman- 28 Nov 2021
Did an amazing job with the shed
JWC&BS LTD
Rating: 5 out of 5
Extension Builder in New Malden
I am fully qualified carpenter with NVQ qualifications. I’ve had experience working with listed building, extensions , loft extension, roofing , first fix , second fix carpentry , kitchens and flooring
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Latest review:
Decking- 30 May 2020
Great work. Nice and tidy. Would use again for general carpentry needs.
Elite building facilities
Rating: 4.5 out of 5
Extension Builder in New Malden
Elite Building Facilities is your one-stop shop for all your home repair and maintenance needs. From plumbing and painting to kitchen and bathroom renovations, carpentry, furniture assembly, and even appliance installation, we have the expertise to handle it all. Our skilled technicians are dedicated to providing high-quality, reliable service to keep your home in top shape.
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Latest review:
Handyman- 12 Feb 2026
The job involved identifying the source of a water leak around my front door. This involved two visits from their handyman. In the first visit, he cleared a gutter above the door and mentioned that the sealing around the door would have to be redone. In the second visit he did the sealing. Unfortunately this part was botched: he used sealant with a color completely different to the door frame. He applied the sealing over the old one, instead or removing the old one. He also applied sealing where he shouldn't have: on one side of a window above the door. Overall, the job completely ruined the aspect of the entrance to my property. The handyman was very nice and polite but entirely unqualified for this job. I have now contracted a professional mastic man company to come and undo what Elite Building Facilities have done and do the job again from scratch. The quote for this is HALF of what I paid to Elite Building Facilities for the botched job.
Ncc maintenance ltd
Rating: 5 out of 5
Extension Builder in New Malden
We made, electricity, plumbing, landscaping, building renovation, carpenter, tiling and paving
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Latest review:
Carpentry- 13 Jun 2022
Highly skilled and excellent work.
VCKS
Rating: 5 out of 5
Extension Builder in New Malden
VCKS Professional service provided on time
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Latest review:
Tiling- 10 May 2025
Victor is excellent. Gave a competitive quote and stuck to it. Victor works quietly and thoroughly. The job was completed on time and to a high standard. I will use him again and I recommend him.
George
Rating: 5 out of 5
Extension Builder in New Malden
I am a NVQ level 2 bricklayer and stonemason with over 20 years of experience. As a professional experienced bricklayer, I can set out and undertake all types of brickwork, stonework and blockwork from garden walls to new houses. I pride myself on my work, so I focus on customer satisfaction and quality workmanship. All work is carried out to a high standard. I understand how hard it is to find a trustworthy and reliable tradesman. Hence when I start a job, I stay until it is finished.
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Latest review:
Bricklaying- 6 Jun 2026
The job was two small garden walls. George explained how the job would be carried out. He is friendly and turns up on time. He is a skilled worker and did a fantasic job. Would recommend George
BM TILING
Rating: 5 out of 5
Extension Builder in New Malden
Build & Renovate BM is offering free estimates and the best ideas on any project you aim to achieve. We are happy to assist you by sharing our experience in delivering a great finished project in detail. Perfect finish at the right price; No stress on the journey. Fully insured. Work warrants. Kind Regards Byli on behalf Build & Renovate BM
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Latest review:
Tiling- 4 May 2026
Really great experiences tiler restored our original floor.

4.3

Top rated Extension Builders

Our Extension Builders in New Malden, are rated 4.3 out of 5 based on 23 reviews from customers like you.

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

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 New Malden 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 New Malden who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in New Malden?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in New Malden 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 New Malden extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your New Malden home extension project is likely to cost.

Find extension builders in New Malden with MyBuilder

Hiring the right extension builder in New Malden 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 New Malden extension builders. Once your job is live, we’ll share it with home extension builders in New Malden who can express their interest.

Step 2: Compare different extension builders in New Malden

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

Step 3: Hire New Malden extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in New Malden, 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.

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

What to ask a New Malden extension builder before hiring?

Before hiring an extension builder in New Malden or extension building company in New Malden, 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 New Malden?

An extension builder in New Malden 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 New Malden 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 New Malden?

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 New Malden 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 New Malden 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 New Malden

Can an extension builder in New Malden help with planning permission?

Yes, many extension builders in New Malden 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 New Malden handle everything from design to construction?

Many New Malden 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 New Malden help with materials and finishes?

Yes, most extension builders in New Malden 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.