5 Top construction companies in London for your next project

We get it, dodging scaffolding and impromptu sidewalk closures has become your morning cardio. And you’re tired of your contractor’s excuses for all of the delays.

But hey, chin up! We’ve been digging through the rubble and found those rare construction companies that don’t treat project timelines like loose suggestions. You know, the ones who finish a project before your newborn learns to walk.

Yep, we’ve done the hard hat-wearing for you, sniffing out the construction heroes who actually deliver on time and on budget (well, mostly).

How we chose

  • Experience – We prioritised companies with a proven track record of successful projects in London, demonstrating their understanding of local regulations and challenges.
  • Expertise – We assessed companies based on their specialisation and range of services to make sure that they could handle diverse construction needs.
  • Certifications – We looked for companies with relevant industry certifications, such as ISO standards, demonstrating their commitment to quality and safety.
  • Customer reviews – We analysed feedback from previous clients to gauge customer satisfaction and the company’s reputation in the market.
  • Company size & resources – We evaluated the size of the company and its available resources, including staff, equipment, and financial stability. 

1. Row London Construction Ltd


Location: 93 Regent’s Park Rd, London NW1 8UR, United Kingdom

Contact: +44 7440 151642

Operating hours:

  • Monday – 7:00 AM to 6:30 PM
  • Tuesday to Friday –  7:00 AM to 7:00 PM
  • Saturday – 9:00 AM to 5:00 PM


Row London Construction Ltd made it onto our list of top-notch contractors for a reason. Despite having only 10 employees, they take immense pride in their work, whether it’s a residential or commercial project.

They’re known for their range of services but one of the standouts we discovered was their bathroom refurbishment. We were impressed by how they blend function with aesthetic appeal. 

It’s no wonder clients rave about their renovated bathrooms not only looking stunning but also significantly enhancing the overall usability of their homes.

Another highlight for us was their expertise in loft conversions. We saw firsthand how they transformed underused spaces into valuable living areas. It’s these kinds of thoughtful improvements that really make a difference.

During our conversations with some of their customers, we heard nothing but praise for the promotional discounts they offer. For instance, they offer a 30% discount on the first cleaning service or painting and decorating services.

We also found booking their services to be incredibly easy. You can do it all through their website, and they even offer online consultations to help you understand the scope and cost of your project. 


  • Range of services
  • Expertise in bathroom renovation & loft conversions
  • Some discounts on first services
  • Online booking & consultation


  • Small team limits capacity

Excels at handling complex refurbishments

“I had a vision for my refurb; Marian, Aura and their team made it reality. They are hard-working, efficient, cost effective, kind, and above all: trustworthy. It initially started with a smaller job, leading into having them refurbish my full kitchen, and I was so pleased with the outcome they came back to redo my entire bathroom. These were not straightforward jobs as my flat is in an old building, but they ajusted to every surprise that came their way, whether plumbing or structural, and found the best possible solution for each problem that arose. I cannot recommend them enough. They truly care about delivering a high quality service and are determined to ensure their customers are fully satisfied. Thanks again for everything, I absolutely love my new home!”

Sarah Memmi, Google Review

Ensures top-notch project completion 

“Throughout the refurbishment process, communication was seamless. I was kept informed of progress every step of the way, and any concerns or questions I had were addressed promptly and efficiently. The team demonstrated a high level of expertise and craftsmanship, ensuring that every aspect of the project was completed to the highest standard.”

Saurabh Verma, Google Review

2. New Line Construction Ltd


Location: 22 Madeley Rd, London W5 2LH, United Kingdom

Contact: +44 7734 456436

Operating hours:

  • Monday to Saturday – 8:00 AM to 5:00 PM


New Line Construction Ltd has been a family-run business for 15 years, and it’s easy to see why they’ve become one of London’s favourites.

For ourselves, what we love about them is their honest approach. Unlike many firms that claim to be specialists in everything, they focus on enhancing and adding value to beautiful period homes in West London. 

Their bespoke joinery services are standouts for us. They offer high-quality joinery, including custom-built furniture and fittings, which honestly adds a personalised touch to homes.

Scheduling services with them is straightforward. We like how easy it is to book consultations and get quotes through their website. Just a few clicks, and you’re on your way.


  • 15 years of experience
  • Home extension and joinery services
  • Online booking


  • Delayed responses

Provides reliable and professional construction services

“New Line Construction Ltd exceeded my expectations. Their construction service was exceptional. The team was highly skilled, efficient, and delivered top-quality results. They communicated effectively throughout the project and ensured everything was completed on time and within budget. I am incredibly satisfied with their work and would highly recommend New Line Construction Ltd for any construction needs. They are a reliable and professional choice for any project. Thanks.”

Nuno Wagemans, Google Review

Provides high-quality expansion service

“New Line Construction Ltd made our kitchen and living area bigger, and they did a really great job. The whole team paid a lot of attention to making things perfect, and the work they did was excellent. We love how our home looks now, and we even told our neighbours about New Line Construction Ltd because we’re so happy with their work.”

Aadam Brown, Google Review

3. Clapham Construction Service


Location: Suite 17, 264 Lavender Hill, London SW11 1LJ, United Kingdom

Contact: +44 20 3950 7957

Operating hours:

  • Monday to Friday – 8:00 AM to 8:00 PM
  • Saturday – 8:00 AM to 7:00 PM


Specialising in loft & home extensions for over 20 years, Clapham Construction Service has mastered various types of loft conversions like Mansard, Dormer, and L-shaped conversions, as well as kitchen extensions and adding additional rooms.

They provide free, no-obligation consultations and detailed quotes, which we found incredibly useful when planning projects.

Plus, if you’re a visual type, you’ll appreciate their 3D virtual tours for loft and home extension services. It’s a fantastic way to visualise the potential changes to your home.

We also like how they have a helpful guide section on their website. It’s a great resource that explains their services in detail.

Also, don’t let their name fool you – they serve a wide range of areas (17 to be exact), including Balham, Battersea, Fulham, Tooting, Wimbledon, and more.


  • Specialisation in loft & home extensions
  • Free consultations and detailed quotes
  • 3D visual tours
  • Large service area


  • Limited services

Make big projects stress-free 

“Would highly recommend Clapham Construction for your loft conversion needs. Paul and Dangis were great to work with – responsive, considerate and happy to explain everything.They also had a great team behind them at every step of the process. Taking on a big project like this can be daunting but the team really made it stress free end to end. We are now really happy with the high quality finish achieved and the new space gained. Don’t hesitate taking your project forward with them!”

Michael Shah, Google Review

Offers reliable and professional loft conversions

“CCS recently completed a loft conversion for us, adding 1.5 bedrooms and a shower room. The process was much smoother than we expected and all completed on the original timetable we agreed. Costs were also more transparent than similar businesses that we contacted for the job. Paul and Dangis dropped in most days and were hands on in managing the project. Their full team and all contractors they work with were friendly, professional and did a great job. They also gave us sensible advice on general roof improvements and fixing up part of an extension done by the previous owners. Would highly recommend them.”

Charlie Francesca, Google Review

4. Collective Construction LTD


Location: 62B Camden St, London NW1 0DX, United Kingdom

Contact: +44 20 7112 8259

Operating hours: Open 24 hours


Founded by Seda Capan and Simon Bailey, Collective Construction LTD has a team of experienced tradespeople who’ve been working together for over 15 years, and it really shows in their work.

They handle everything from kitchen and bathroom refurbishments to extensions and conversions. But what really caught our attention is their skill in exterior renovations. 

They do it all – landscaping, exterior repairs, prepping and repainting houses and buildings. Inside, they’re just as meticulous, handling interior prep, painting, and wallpaper hanging with great care.

One thing we found refreshing about them is their personal touch. Instead of booking online, you call them to set up an on-site job assessment. After the initial chat and meeting, they provide a comprehensive estimate and possible dates to start the work.


  • Years of experience
  • Range of services
  • Expertise in exterior renovations


  • No online booking and quotes

Exceeds expectations with fabulous results

“Seda and his team are amazing and the quality of their work is outstanding. They replaced our garage roof, our bathroom and en-suite. They look fabulous! Seda was quick to inform us of any unexpected issues and updated us with photos and videos of progress. We couldn’t be happier with the work and wouldn’t hesitate to call them in the future for any additional work. Thank you Collective Construction!”

Vicki S, Google Review

Deliver perfectionist-quality results

“Seda and Simon built a side return extension, then fitted a new kitchen and new bathroom for me.  They were brilliant – full of ideas, great at problem-solving and absolute perfectionists in everything they did.  I am delighted with the results and can’t recommend them highly enough.  They are also unfailingly polite, cheerful and great to be around, which helps!”

Lizzie Knight, Google Review

5. Proficiency Design and Build


Location: 31 Fortune Green Rd, London NW6 1DU, United Kingdom

Contact: +44 20 7435 6231

Operating hours: 

  • Monday to Friday – 8:00 AM to 5:30 PM


Since 2011, Proficiency Design and Build has been leading the way in construction, luxury design, and building. 

They offer a wide range of services, but they seem to specialise these days in basement conversions. Whether you’re dreaming of a home cinema, a gym, or an extra living area, they transform basements into beautiful, livable spaces.

Anyway, one thing we appreciate about them is their end-to-end project management. They handle everything precisely, from site surveys and design to planning applications, structural drawings, and the actual construction work. 

Compared to other companies we’ve looked at, this company also offers something special: a 15-year guarantee on all structural work. 

We also found it easy to request a quote through their website, which made the whole process straightforward and convenient.


  • Years of experience
  • Excellence in basement conversions
  • 15-year guarantee
  • Online quotation


  • Limited availability

Provides regular progress updates and ensure minimal disruption

“We contracted Proficiency to build our kitchen extension, which involved a few months of construction work and the design and fitting of our new kitchen. The project ran extremely smoothly, and we would not hesitate to strongly recommend this company. We were kept regularly informed of progress at all times but they managed the entire project meticulously, and completed the work within projected timelines and right on budget, which is rare in this industry. The team were extremely considerate and professional, working within agreed hours during the day and ensuring a minimum of noise and disruption to us and our neighbours during the construction. The kitchen was designed excellently, and down to the finest detail the team at Proficiency took great pride in their work and customer satisfaction. The whole experience has been outstanding from start to finish and we would heartily recommend using this company.”

Richard Willock, Google Review

Accommodates special requests and last-minute changes

“I am pleased with and grateful for their work on my flat refurbishment. From site survey, design and build, to final finishing touch, they helped me throughout the project. They were really professional and did not compromise on the quality of their job. Not only they were willing to accommodate my many special requests, sometimes a change of plan at the last minute, but they were not shy away from making practical suggestions, which all proved to be invaluable. I guess for most home owners building projects is a painful process, but oddly for me this has been an enjoyable journey thanks to their great team.”

An-Heng Yang, Google Review


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