The 5 best builders in London you can trust for a stress-free construction and renovation
No one wants to hear concerns about structural weakness or wake up after a storm to find their roof missing.
Whether you’re a business owner or a homeowner, the last thing you want is a property that looks, feels, and is actually fragile. To avoid that, what you need is a skilled team to handle the planning, source quality materials, and execute the work with expertise.
That’s why builders are there to make sure those and other problems don’t happen to you.
In London, these top builders are known for their reliability and high-quality craftsmanship, making them the best choice for your next project.
How much does hiring a builder cost in London?
The cost of hiring a builder in London ranges from £1,750 to £3,000 per square meter for a house build, with labor costs accounting for between 35% and 55% of the total build cost. Factors affecting the cost include project complexity, timeline, and the type of builder.
1. NStar Builds – Builders London
Address: 79 Whitehall, North London
Phone: +44 20 3576 0166
Business hours: Everyday, 24 hours
Clients know NStar Builds for their professionalism, attention to detail, and commitment to quality. From the initial design to project completion, every aspect is said to be handled to an incredibly high standard—often exceeding expectations.
It’s no surprise, given their dedicated team of professionals who have been delivering long-lasting craftsmanship for over 15 years. Serving both domestic and commercial spaces, NStar Builds upholds the highest construction standards.
Their home refurbishments and basement or loft conversion services are especially popular among clients. But what they like most is the team’s open and honest communication, keeping them informed throughout the entire process.
Although their craftsmanship is highly praised, there is little publicly available information about their warranties or post-project support. If you’re a homeowner or developer looking for clarity on guarantees, direct inquiries are required.
Expertise shines through in the finished product
“I recently done a full refurbishment at one of my properties, and I couldn’t be more thrilled with the results. From start to finish, Shane and the Nstar team were absolutely fantastic. Their professionalism, attention to detail, and commitment to quality were truly exceptional. The work was completed to an incredibly high standard, exceeding all my expectations. They were punctual, courteous, and kept me informed throughout the entire process. It’s clear that they take great pride in their work, and their expertise shines through in the finished product. I wholeheartedly recommend NSTAR to anyone looking for reliable and top-quality building services. You won’t be disappointed!”
- Michael Pryce, Google Review
Quality of work exceeded my expectations
“I am delighted with the outstanding work Shane and team delivered on my apartment renovation. From start to finish, their professionalism, attention to detail, and craftsmanship were exceptional. They managed the entire project seamlessly, coordinating all aspects to ensure a smooth experience. The team was also incredibly friendly, respectful, and tidy—especially when I had to move in partway through the renovation, making the process as comfortable as possible. The quality of work exceeded my expectations, and I couldn’t be happier with the result.”
- Meghan Barlow, Google Review
2. Forma London
Address: 8 Coldbath Square, London
Phone: +44 1992 578 664
Business hours: Monday-Friday, 8:00 AM to 6:00 PM
Forma London is all about creating sustainable spaces that are not only well-designed but also kind to the environment and local communities. That’s why they encourage clients to go green with features like air-source heat pumps, LED lighting, and energy-efficient HVAC systems.
Their full turnkey service takes care of everything—from design, fit-out, and refurbishment to furniture, move management, and even aftercare maintenance. This way, you get a ready-to-use space without having to manage different aspects of the project.
On top of that, Forma’s professional and friendly team brings their expertise to various sectors, including workplace, industrial, healthcare, leisure, and residential. No matter the project, all clients say the same thing: everything is completed on time and within budget.
However, some clients wish for more upfront details about their warranties, suggesting they be readily available online. Also, while Forma takes on urgent projects, their high demand means you’ll need to book well in advance for most jobs.
Work done efficiently and quickly
“Our beautiful private gym was hit badly by flooding. Forma were on site within 24 hours of recommendation to give us a thorough quote. James, the Director is so professional and asked for important details so he could formulate a plan and get the work done efficiently and quickly. He recognised the urgency for us to re-open, as a small business. His builders are second to none. They work so hard, with such quality and efficacy. Our gym now looks even better than it did before. I still cannot get over the speed and standard of the work in such a time efficient duration. We won’t go anywhere else for our next site! Highly recommended.”
- Kim Johnson, Google Review
Kept to a very tight deadline
“We had Forma complete a garage conversion on our house last year and we will definitely be using them on our next project. Matt and his team from the outset were professional, friendly and in challenging times kept to a very tight deadline. When supplies were delayed Matt had would personally drive to go and get the parts to make sure the build was not delayed. The conversion was completed to a very high standard and I would have no hesitation recommending them.”
- Jamie-lea Butterfield, Google Review
3. North West London Builders Ltd
Address: 264 Belsize Rd, London
Phone: +44 7955 312 345
Business hours: Everyday, 24 hours
CRB (Criminal Records Bureau)-checked and a member of the National Association of Building Contractors, North West London Builders Ltd is trusted for high-specification construction. Their skilled builders specialize in both residential and commercial buildings.
They don’t just build homes and properties, they also cover everything from roof repairs to painting, decorating, and interior work. This makes them a true one-stop shop for all your building needs.
Past clients keep coming back for a reason—they love how fast the team responds and how flexible they are with last-minute changes. Plus, the daily updates and fair pricing make the whole process easy and stress-free.
On the downside, a few clients encountered contractors who missed appointments without notice. One customer expressed disappointment when the contractor confirmed a visit for a renovation quote but never followed through or even called to reschedule.
Responded quickly and reasonable price
“We called North West London Builders for the exterior plastering of our home. Bill responded quickly and came to our house right away. he quoted the price which was reasonable. The team was very prompt, and professional and did the job in two days. Highly recommended.”
- Donna Bryant, Google Review
Reached out to us daily with updates
“We could not be more pleased with the work that North West London Builders did at our place in Hampstead. Both in repairs and painting, their work is impeccable and they reached out to us daily with updates and were flexible when we had to make last-minute changes. I highly recommend them.”
- Jean Harris, Google Review
4. The Building Constructor
Address: Office 7, 186 Greenford Ave, London
Phone: +44 20 3389 8065
Business hours:
- Monday, Wednesday to Friday, 7:00 AM to 9:00 PM
- Tuesday and Saturday, 7:00 AM to 8:00 PM
- Sunday, 8:00 AM to 6:00 PM
With over 25 years of experience and multiple locations across London, The Building Constructor knows the ins and outs of building planning and regulations. They make sure that all projects, whether residential or commercial, are safe and meet legal standards.
Customers highlight good experiences with their extensions and loft conversions, mentioning how these projects are done to high standards by trusted and reliable contractors. The staged payment system also makes financing easier for them and helps keep projects on schedule.
As a City & Guilds-qualified company and a member of The Chartered Institute of Building, they truly adhere to industry best practices. Even more, they offer free quotes and flexible appointment times that work around your schedule.
Despite the positives, The Building Constructor experiences peak demand during spring and summer (March to August) when construction projects are in full swing. This may lead to longer wait times for scheduling, especially for larger projects.
The best experience we’ve had
“The loft and extended kitchen area looks great and the home just feels like a mansion now, all this extra space for the kids is awesome. I want to leave a good word for this firm when it comes to home builders, hard to find trusted and reliable ones these days and most of all certified contractors, building constructor is the best experience we’ve had from all 5 times in my life doing home projects, recommended highly for family house holds that do not want to lose savings.”
- Gayle Fleming, Google Review
Staged payments made it easy
“We got a decent service on our loft and extension build of a home we were developing after buying from auction, the team here is professional and all about work. Staged payments made it easy to obtain finances and finish the project on time, I can recommend to other home owners within London area asa trusted contractor.”
- Alam Din, Google Review
5. Row London Construction Ltd
Address: 93 Regent’s Park Rd, London
Phone: +44 7440 151 642
Business hours:
- Monday, 7:00 AM to 6:30 PM
- Tuesday-Friday, 7:00 AM to 7:00 PM
- Saturday, 9:00 AM to 5:00 PM
At Row London Construction Ltd, you’ll be working with professional designers and artisans to come up with functional, stylish designs for your property. Their highly trained staff also does all the work from painting and decoration to plumbing and heating.
If you’d like customized planning and remodeling, they have reliable and accurate builders who tailor their renovation services to match your needs and budget. Whether it’s for home refurbishments or loft conversions, their team ensures a personalized experience.
But what truly makes them stand out to customers is their efficiency and craftsmanship, especially in their kitchen fitting services. Clients also shared that the team always shows up on time and is hardworking, leaving the site clean at the end of each day.
That said, they may prioritize larger projects over minor repairs or quick renovations. This could make it harder for clients seeking small-scale work to secure an appointment, meaning longer wait times and limited availability.
Understood what I wanted and exceeded expectations
“I am very pleased with the schedule of works and the quality of craftsmanship done in my kitchen. It’s almost like a completely new kitchen with a beautiful new kitchen counter top and flooring. The company understood what I wanted but they far exceeded my expectations and the result is great. I will recommend Mario and his company to all my friends and family.”
- Nenita Gomez, Google Review
Honest, efficient, and hardworking
“Aura and the Marians replaced our kitchen unit doors and repaired a worktop, all of which had been damaged by tenants. From the first meeting, I found them to be honest, efficient, and hardworking. They turned up on time, cleaned up at the end of each day, and kept us informed at every stage. Above all, I am so pleased with the way they have managed to rescue our kitchen. I’d highly recommend Row London and already have them in mind as the choice for our next refurbishment. Thank you, Marian, Aura and Marian you’re all wonderful.”
- Angela Dennie, Google Review