Extension Builders in Kings Cross

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (18 reviews)

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Some of our top rated extension builders in Kings Cross

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Ictinus Contractors
Rating: 4.9 out of 5
Extension Builder in Kings Cross
Ictinus Contractors is a reliable London-based building and renovation team, delivering high-quality workmanship across residential and selected commercial projects. We specialise in painting and decorating, wallpapering, plastering and skimming, hard flooring installation, bathroom fitting, and general property improvements. We take pride in providing clean, well-organised work with strong attention to detail from start to finish. Whether the job is a single-room refresh, a bathroom upgrade, new flooring, or wider renovation work, our focus is always the same: quality finishes, honest communication, and dependable service. Based in East London, we cover surrounding areas across London and work closely with every client to make sure each project is completed to a high standard, on time, and with care.
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Latest review:
Painting & Decorating- 6 Apr 2026
I had a very positive experience working with Konstantinos. He is personable, reliable, professional and excellent at co-operating throughout the process. He repainted my entire flat/walls/ceilings to a high standard (and sanded down) he also helped address a few additional repairs along the way. The finish is clean, fresh, and has completely transformed the space. He was thorough and ensured everything was completed properly and on time. I particularly appreciated his attention to detail and his proactive approach in taking care of things I hadn’t even noticed. I would happily recommend Konstantinos and would work with him again in the future! Thank you
ASAR PLUMBING AND BUILDING
Rating: 5 out of 5
Extension Builder in Kings Cross
I am a qualified plumbing heating engineer and General builder, i have learned my trade working for a plumbing / building company for 15 years. i have also been Nescot College for four years where i gained my qualification. I am hard working person, honest, trustworthy and take pride of my job. Customer satisfaction is my top priority.
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Latest review:
Extensions- 17 Mar 2024
Agim and his team were great - communicated what they would do at each stage, the timing, materials needed etc., no major surprises. The building is quite old and wonky in places so they had to work with that and the finished result looks great. Very happy and have would recommend Agim again!
Zenstruction
Rating: 5 out of 5
Extension Builder in Kings Cross
Established in 2005, we are a trusted building company with extensive experience in all aspects of construction, from new builds to fascia and gutter installations. Known for delivering high-quality projects on time and within budget, we maintain the highest standards of workmanship, safety, and reliability. Our expertise spans a wide range of services, ensuring that each project is completed to exceptional standards, meeting both client expectations and industry regulations.
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Latest review:
Extensions- 3 Sep 2018
Zen has helped transform our home, we’ve drawn a lot of confidence from his considered approach and thorough work ethic. He’s so far addressed the cause of cracks to exterior walls of our property and has provided lasting solutions. We also asked him to plaster our hallway and update the banisters for us, Zen has done a great job of reinforcing the strength of the original features whilst retaining the property’s character. Very good with pets too. Looking forward to the next project.
E Building Services
Rating: 4.5 out of 5
Extension Builder in Kings Cross
Hi, I have over 12 years of experience in the construction and renovation industry, with specialist expertise in: * Drylining * Carpentry * Restaurant refurbishments * House refurbishments * Loft conversions * House extensions Over the years, I have built a trusted team of skilled and qualified tradespeople, allowing us to manage projects from start to finish — from planning and groundwork through to the final finishing touches. Our Services Include: * Plumbing (Gas Safe registered) * Electrical work (fully certified) * Roofing * Loft conversions * House extensions * Groundworks * Gardening and landscaping * Fencing * Waste removal No job is too big or too small. We take pride in delivering high-quality workmanship, reliable service, and excellent communication throughout every project. I’m always happy to offer advice, answer questions, and discuss your requirements with no obligation. Thank you for taking the time to visit my profile. I look forward to hearing from you and helping with your next project.
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Latest review:
Fencing- 28 Jul 2026
The garden door had been off its frame due to subsidence and vandalism. E Building refitted the door. Unfortunately, due to subsidence, the door can now not be unlocked.
Spring Construction Solutions Ltd
Rating: 5 out of 5
Extension Builder in Kings Cross
We undertake all aspects of residential and commercial building projects with regard to refurbishment and extensions. We have 45 years experience in the building trade and also working with architects and surveyors as well as managing our own projects.
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Latest review:
Restoration & Refurbishment- 25 Feb 2020
Malcolm and his team did great work on my house. The job consisted of full house redecoration, building bespoke shelving and built in wardrobes, loft boarding and installing ladder, replacing fencing and general pruning in the garden. They were able to turn their hands to all manner of jobs. Malcolm had a full team onsite every day and they finished the work ahead of schedule. At all times Malcolm was very responsive and worked hard to ensure that any changes along the way were accommodated. I would happily recommend Spring Construction and would not hesitate to use them again in the future.
Onyx Construct Limited
Rating: 5 out of 5
Extension Builder in Kings Cross
We are a multi-trade construction company operated in domestic sector and we are able to full-fill any building requirement. The scope of projects we have delivered in the past spans from smallest jobs like kitchen or bathroom fitting to extensions, house refurbishments or loft conversions.The majority of our previous clients were extremely satisfied with high standard and quality of work. If you are looking for professionals builders with reasonable prices - you are on the right profile !
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Latest review:
Extensions- 29 Nov 2023
We had the most fantastic experience with Sarunas. He was highly professional from start to finish and completed the work to the highest standard. We extended our project significantly once we realised how excellent he was and he has now renovated our whole home over an 18 month period. He was able to guide us through the process and help us make key decisions which made the experience smooth and efficient. He is extremely skilled in all aspects of building, has high attention to detail and is a pleasure to have in your home! I couldn't recommend him higher and look forward to having him back in future to convert our loft!
SDS CARPENTRY & BUILDING SERVICES LTD
Rating: 5 out of 5
Extension Builder in Kings Cross
SDS CARPENTRY & BUILDING SERVICES LTD is a team of qualified builders with over 15 years of experience and have all the skills necessary to take on board any building project at an extremely high standard. Yes, we’ll add real value, save you time and effort, keep disruption to a minimum and manage the project from design to final-fit. Our clients choose us because we have exceptional customer service and can deliver projects on time and within budget.
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Latest review:
Carpentry- 9 May 2020
I had a parquet floor laid and was very pleased with the result and attention to detail. Sergiu worked very hard and was a pleasure to deal with.
"Surudo" Building & Decorating
Rating: 5 out of 5
Extension Builder in Kings Cross
We are team of experienced builders provides professional execution of small, medium and larger projects, all types of refurbishment, maintenance and building services for private and business customers in London and surrounding areas. All of our work is carried to the highest standards.
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Latest review:
Bathroom Fitting- 3 Sep 2020
He is very professional and has done a good job on refurbishing my bathroom.
CLS INTERIORS LTD
Rating: 5 out of 5
Extension Builder in Kings Cross
We offer a wide range of services in the construction field for both residential and commercial customers, each with unique and tailored demands. top quality finish and with 10 years experience in Tiling, plastering, painting and decorating and all these to a very professional finished job. Very reliable and correct on time. I always care about details at work and thats a work ethic for me. For more quality proof jobs see photos ! We are currently doing some changes on our website at the moment and wont be available to visit for a short period of time. For all quality proof of jobs which we update regularly check our social media platforms Instagram: CLS_INTERIORS_LTD Tiktok: clsinteriors
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Latest review:
Painting & Decorating- 20 Jul 2025
We would highly recommend this company, Silvan work is of a high standard, we required coving installed as well as decorating. He completed the work in the timeframe given, the room was left tidy and will be using them In the future.
KUBEL LTD
Rating: 5 out of 5
Extension Builder in Kings Cross
Welcome to KUBEL LTD, your trusted partner for all your construction and renovation needs. We specialise in building and renovating extensions, roofs, and gardens to transform your home into your dream space. With our expertise and dedication to quality, you can trust that your project will be completed on time and to your satisfaction.
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Latest review:
Wonderful and honest. Excellent finish.
Buildstead Development Ltd
Rating: 5 out of 5
Extension Builder in Kings Cross
Our team at Buildstead has over 25 years of experience in the construction industry covering a wide range of project types. We truly are your "one-stop shop" when it comes to your project. From design to build, we pride ourselves on our integrity, the quality of our work and the working relationship we enjoy with our clients. With full project management included, you will be kept up to date at each step along the way ensuring complete peace of mind.
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Latest review:
Kitchen Fitting- 5 Nov 2020
An incredibly positive experience from start to finish. I found Robbie and team were hard workers, very likeable and provided brilliant results. Comms throughout were excellent. With Robbie happy to discuss the job over the phone beforehand and put our minds at ease. A big shout out to the team for undertaking this work during COVID. We understand the pressures this places on our tradespeople and we thank Robbie and his team for their diligence and commitment to wearing masks in our home and working safely. A brilliant experience.
Regionwood Ltd
Rating: 5 out of 5
Extension Builder in Kings Cross
At Regionwood Ltd, we provide a high standard of work in various areas of building trades. We specialise in all aspects of building work, including full refurbishments, bespoke kitchens, bathrooms, extensions, flooring and decorating. We pride ourselves in our attention to detail, honesty, punctuality and reliability, to provide you with great customer satisfaction and peace of mind.
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Latest review:
Painting & Decorating- 17 May 2025
No issues. Done a great job. Protected everything prior to starting and cleaned up afterwards. Would 100% recommend.
ADJ Builders Limited
Rating: 5 out of 5
Extension Builder in Kings Cross
Hello ..my name is Alfred. I, have over 12 years of experience in building site. Perfectionist in my work and ability to guarantee customer satisfaction. Hard working and ensures all deadlines and targets are met. A good eye for detail, precise and accurate at all times and will complete all work to the highest standards.My experience shows in the finish, with no visible streaks. Polite friendly and helpful.
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Latest review:
Painting & Decorating- 6 Oct 2022
Very pleased with our choice. We initially got four quotes from different builders, most of them were terrible at communicating apart from Alfred. He was very easy to work with, responsive and very careful with our brand new house. His team was hard working, tidy and fast. They completely renovated our garden from removal of old decking and gravel to setting up new fences, levelling and turfing the ground. They also removed our old kitchen, partition wall and carpet, as well as did jobs like plastering, building a wall and set up lights and shelves. We’ll surely have him back soon to work on other jobs.
Adam Favor
Rating: 4.8 out of 5
Extension Builder in Kings Cross
Our business was founded to offer clients the opportunity to bring a vision to life. As a design & build business we can take your dream home concept and turn it into reality. We will provide you with design plans for your projects and thorough project management. We also have the professional, experienced and quality tradesmen that are essential to complete the construction phase of the project.
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Latest review:
Plastering- 17 Jun 2024
Adam Favor and NOVA Design & Build are a nice bunch of guys and they are reliable/helpful. However, when it came to coving, architrave and flooring, acceptable standards were unfortunately not met. Other specialists had to be brought in to re-do around 20% of the job; namely certain sections of the cornice and door architrave. In the former, a few things were below standard including: 1) not joining the friezes in the correct places, 2) cutting inaccurately, 3) leaving gaps, 4) using silicon as a filler and adhesive. For the door architrave, the wood was misaligned and not glued/nailed properly. The flooring was not laid well because there are huge gaps at times; sometimes at 1 cm. Since the kitchen has been installed, it is too late to take up the floorboards again. The most dubious thing of all in this job was the quote received for decorating which was c. 15k for 47 m2. This included plastering repairs, but ultimately the job got done by someone else to a high standard at 7k.
Pawel
Rating: 5 out of 5
Extension Builder in Kings Cross
I am part of a dedicated two-man company with over 15 years of experience in the construction industry. We specialize in a wide range of construction projects, from extensions and loft conversions to garden transformations, as showcased in the photos below. When you choose me, you’re not just hiring a builder—you’re investing in exceptional craftsmanship, meticulous attention to detail, and a commitment to exceeding your expectations. I take great pride in my work, and my recent projects speak for themselves. I’d be delighted to share examples and even arrange visits to completed sites, where you can see the quality of my work firsthand and hear directly from satisfied clients. Your satisfaction is my priority, and I am committed to bringing your vision to life with professionalism and care. I look forward to discussing how I can help make your project a reality. Best regards,Paweł
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Latest review:
The job was to remove a stud wall with an archway between my kitchen and hall. Pawel was excellent from start to finish. He was good to communicate with before, and answered my questions fully. He turned up on time, was very neat and kept the noise down. He did a great job and cleaned up afterwards. I’d recommend!
Levan’s services
Rating: 5 out of 5
Extension Builder in Kings Cross
Hi, my name is Levan. I have over 12 years of experience in the construction industry and work together with a skilled and reliable small team. We take pride in delivering high-quality workmanship, attention to detail, and honest service on every project. We specialise in all types of residential construction and refurbishment work, including: * House extensions * Loft conversions * Full house and flat refurbishments * Brickwork and blockwork * Painting and decorating * Kitchens installation * Tiling and all types of flooring * Laminate flooring * Bespoke furniture and fitted wardrobes * Carpentry and joinery * Garden rooms and summer houses * Fencing and garden projects Whether it’s a small job or a complete renovation, we always aim to provide professional results and ensure our customers are fully satisfied with the finished work. Reliable, hardworking, and committed to quality — we are happy to help bring your ideas to life
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Latest review:
Carpentry- 9 Jul 2026
he pays attention to details, great job

4.1

Top rated Extension Builders

Our Extension Builders in Kings Cross, are rated 4.1 out of 5 based on 18 reviews from customers like you.

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Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

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.