Extension Builders in Kings Cross

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (19 reviews)

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Some of our top rated extension builders in Kings Cross

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D.S builders
Rating: 5 out of 5
Extension Builder in Kings Cross
Hi there I am a reliable tradesman and pay etention to detail. Been in the building industry for over 20 years.
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Latest review:
Tiling- 19 Apr 2023
Steve was very helpful and worked quickly to get the job done He is very knowledgeable and also completed another job for me I would definitely recommend him He helped me choose products and collected materials I needed Very glad I chose him to complete the work
Jaches construction
Rating: 5 out of 5
Extension Builder in Kings Cross
Architectural Engineering drawings. Construction. Ground and first floor Extensions. Loft conversions. Interior design. Painting and decoration. Boiler installations.
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Latest review:
Conversions - General- 28 Jul 2023
I had Tony in to do my ballastrade, he also ended up doing a lot more work including my driveway, have recommend him to several people and all have used him, highly recommend
New Vision Designs Limited
Rating: 5 out of 5
Extension Builder in Kings Cross
Welcome to New Vision Designs, where craftsmanship and attention to detail converge across a spectrum of construction projects. Our proficient team excels in Residential Refurbishment, Commercial Fitout, Full Design and Build services. From METSEC and SFS installations to Drylining, Painting, Decorations, and Mechanical & Electrical (M&E) work, we deliver exceptional results. With a steadfast dedication to quality, we bring extensive expertise and proficiency to each project we undertake.
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Latest review:
Painting & Decorating- 1 Dec 2024
Jay and the team at New Vision Designs were excellent - I was able to leave house, them with keys, returning to tidy, well organised project lasting 5 days. Throughout they sent me whatsapp video updates, kept me in the loop on any milestones... so so greatful and will be using them again soon !
Hys Contractors
Rating: 5 out of 5
Extension Builder in Kings Cross
We are a very experienced company with over 25 years in the building industry. We undertake all building works from refurbishment, extensions, painting and decorating, tiling, plastering, electrics and plumbing. We operate all around London.
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Latest review:
Restoration & Refurbishment- 14 Mar 2022
Albert and his colleague were both very friendly, they completed the work within the time scale they said they would and to a high standard. I am very pleased with their work and will be using them again!
Nicolae Mitroi
Rating: 5 out of 5
Extension Builder in Kings Cross
call my company with confidence our customer our master. you will not regret No.oseven9Ɛ|8Ɛtwo9seveno 0t7.9r3e1u8,3p2c9a7,0
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Latest review:
Handyman- 24 Nov 2024
Very reliable, l highly recommend for any job such as floor fitting, tiles etc. nice guy, good prices.
ASC
Rating: 5 out of 5
Extension Builder in Kings Cross
Plumbing & heating — full professional range ASC HEATING & PLUMBING is based in London and works across London and the surrounding areas. With 6+ years in business, we offer everything from emergency call-outs and repairs to installations, leak detection, drains, bathrooms, boilers, central heating, underfloor heating and commercial plant rooms — planned so you know scope, timescale and cost up front.
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Latest review:
Plumbing- 1 Apr 2026
Aurel and his son did a great job, really knowledgeable and helped with a difficult job. Not only were the results fantastic but the guys were a pleasure to have around.
PMB Construction (UK) Ltd
Rating: 4.9 out of 5
Extension Builder in Kings Cross
PMB Construction is London based building company delivering exceptionally high standard services, specialise in most building aspects including loft conversions and extensions. PMB Construction (UK) Ltd is fully insured company, we pride ourselves on high recommendations and customer satisfaction.
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Latest review:
Extensions- 5 Sep 2019
One of the best builders I have ever worked with. PMB take great pride in the work they do and finish to a exceptional level (even better than a lot of premium and expensive builders in the industry). Colin's knowledge about all aspects of building work is unmatched and that shows in the end product that he and his team delivered for me. PMB did a full refurbishment & substantial extension (everything knocked down except 3 external walls) - ground floor ext, first floor ext, loft extension, full re-wire, plumbing, gas, UFH, walls, plastering, fitting, decorating etc. His prices are reasonable and he advised when unexpected costs come up so I could make a decision on what to do. I will definitely use him again.
Leonard goli
Rating: 4.7 out of 5
Extension Builder in Kings Cross
Highty skilled construction with 10 years experience. Expertise in planning construction projects,defining scopes of work and labord costs. With plenty of experience in all aspencts of loft convention extensions barhrooms,kitchens,tiles,floor etc
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Latest review:
Decking- 1 Jun 2026
Extremely helpful and professional. Thank you
A.R.Renovators
Rating: 5 out of 5
Extension Builder in Kings Cross
We are a family-run team made up of an experienced Architectural Technician and a skilled site manager and builder with over 20 years of experience delivering high-quality renovation services across London. Combining technical expertise with hands-on construction knowledge, we’re committed to providing reliable, professional service with attention to detail at every stage. We take pride in meeting deadlines, staying within budget, and exceeding client expectations through clear communication and quality workmanship.
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Latest review:
Conversions - General- 20 Jun 2026
My partner and I hired Alonso and Alex to undertake a full renovation of our 3-bedroom house in SE8. Having received quotes from several other contractors, the moment we met them, it was clear they were clear communicators, approachable and dedicated to their clients. We’re incredibly happy with the work they did. The scope of work was highly varied, including rectifying historical damp issues in the lower ground room, external repairs to the roof drains and chimney, installing two new bathrooms, plus all the other internal and external work you’d expect from a full renovation. All of which was completed to a very high standard! They were always open to discussing and rectifying anything we weren’t completely happy with, or problem-solving whenever unexpected issues arose (which always happens when renovating a property of this size!). The team are lovely, trustworthy people who are a genuine pleasure to have in your home. I can’t recommend them highly enough.
GRANEROS IMPROVEMENTS LTD
Rating: 5 out of 5
Extension Builder in Kings Cross
Responsibility
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Latest review:
Carpentry- 21 Mar 2026
Adi has performed an excellent job, repairing couple of garden fences, very satisfied with his work and the way he has handled the job!
MOVIX CONSTUCTION
Rating: 5 out of 5
Extension Builder in Kings Cross
👷‍♂️ Hello, With over a decade of hands-on construction experience, I offer expertise tailored to your project's needs. From residential renovations to commercial ventures, I'm committed to delivering excellence. Let's build something exceptional together!
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Latest review:
Good guy very experienced and professionals completed the job well
GMG - Georgian Masters Group Limited
Rating: 5 out of 5
Extension Builder in Kings Cross
Hello. We are a new company, whose team consists of professionals with many years experience working both for residential and commercial property. You can boldly rely on the renovation of your home to our team, convince me the result will exceed expectations.
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Latest review:
Kitchen Fitting- 13 Oct 2024
Great communication, always available to clarify client questions, very diligent. Job well done and great finishing's. Thanks a lot Natella and team for all the effort
TechnoHeat
Rating: 4.8 out of 5
Extension Builder in Kings Cross
We are Gas Safe and Heating engineers for over 15 years and and have been involve in all aspect of Gas.Heating.Plumbing jobs including boiler fault finding and Heating problems also we have very good reference in the bathroom and shower installation. Member of Vailliant Advance ,Baxi works to be able to register a new boiler for 7 and 5 years part and Labour warranty. No call out charges.
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Latest review:
Plumbing- 24 Sep 2018
Had confirmed I would take a day off for the job. Received a text on the day at the time he was meant to come saying van had broken down and could not come. Then offered to send a friend to do the job. Waste of a day and spent morning running around buying the equipment. If the van did really break down then that’s a fair excuse. Negative experience from my end.
Ferati & Sons
Rating: 5 out of 5
Extension Builder in Kings Cross
With over 25 years of experience, we provide reliable, high-quality building services across the local area. We’re known for our attention to detail, clear communication, and getting the job done right first time. We specialise in: • Extensions • Groundworks & drainage • Conversions • Structural steel work (RSJs) • Rendering • Underpinning • Plasterboarding & internal works From small improvements to full property transformations, we manage every stage professionally and efficiently. We keep sites clean, stick to agreed timelines, and make sure you’re informed throughout the project. Most of our work comes from repeat customers and word of mouth - something we take great pride in. Get in touch today for a free, no-obligation quote and friendly advice
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Latest review:
Groundwork & Foundations- 11 May 2026
Excellent timing , communicated well explained everything clearly . Completed the job on the same day .
Builder
Rating: 5 out of 5
Extension Builder in Kings Cross
Welcome to our versatile construction services. We specialize in: Bricklaying: Crafting sturdy and appealing structures. Blocklaying: Building strong foundations for your projects. Garden & Retaining Walls: Enhancing your outdoor spaces. Porches: Creating inviting entryways. Extensions: Expanding living spaces seamlessly. Landscaping: Designing captivating outdoor environments. With attention to detail and commitment to excellence, we're here to turn visions into reality.
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Latest review:
Blerim undertook the task of constructing a rear extension to my home, which involved creating additional living space while seamlessly integrating it with the existing structure. The project was quite intricate, requiring meticulous attention to detail and a deep understanding of construction techniques. Blerim's craftsmanship was truly remarkable. He demonstrated an unwavering commitment to quality, ensuring that every aspect of the extension was completed to the highest standards. His precision in measurements, choice of materials, and execution of design elements exceeded my expectations. Throughout the construction process, Blerim exhibited the utmost professionalism. He was always punctual and kept me informed about the project's progress. His communication skills are commendable, as he patiently answered all my questions and addressed any concerns I had. His ability to work collaboratively with me and the other contractors involved in the project contributed to a smooth and efficient workflow. One aspect of Blerim's work that I found particularly impressive was his reliability. He consistently met project deadlines and stayed within the agreed-upon budget. This reliability gave me peace of mind throughout the construction process, knowing that I could trust Blerim to deliver as promised. In addition to the extension, Blerim also transformed my outdoor space with his landscaping expertise. He took my vision for a beautiful and functional outdoor area and turned it into a reality. His landscaping work included planting trees, creating flowerbeds, installing a patio, and adding various hardscape features. The result is a stunning outdoor oasis that I now enjoy daily. In summary, I wholeheartedly recommend Mr. Blerim for any construction or landscaping project. His workmanship is exemplary, his professionalism is unmatched, and his reliability is unquestionable. Blerim's dedication to delivering top-notch results truly sets him apart, and I have no doubt that he will excel in any endeavor he undertakes.
DARDANIAL LIMITED
Rating: 5 out of 5
Extension Builder in Kings Cross
Dardani. al Limited Experts in RC frame construction, deep drainage, basements, groundworks, steel fixing, refurbishments, loft conversions, brick & block work, and underpinning. Delivering quality, precision, and reliability on every project — from the ground up, Tarmac takes on all aspects of ground works, including structure, landscaping, civil engineering, and fencing
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Latest review:
Groundwork & Foundations- 4 Jul 2026
Gaz and his team did a fantastic job digging and laying the foundations for our natural swimming pond. They were punctual, friendly, and efficient throughout. I’d highly recommend them and want to thank the whole team for their great work

4.1

Top rated Extension Builders

Our Extension Builders in Kings Cross, are rated 4.1 out of 5 based on 19 reviews from customers like you.

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

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 Kings Cross 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 Kings Cross who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Kings Cross?

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

Find extension builders in Kings Cross with MyBuilder

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

Step 2: Compare different extension builders in Kings Cross

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

Step 3: Hire Kings Cross extension builders with confidence

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

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

What to ask a Kings Cross extension builder before hiring?

Before hiring an extension builder in Kings Cross or extension building company in Kings Cross, 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 Kings Cross?

An extension builder in Kings Cross 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 Kings Cross 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 Kings Cross?

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 Kings Cross 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 Kings Cross 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 Kings Cross

Can an extension builder in Kings Cross help with planning permission?

Yes, many extension builders in Kings Cross 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 Kings Cross handle everything from design to construction?

Many Kings Cross 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 Kings Cross help with materials and finishes?

Yes, most extension builders in Kings Cross 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.