Loft conversion companies in Merton

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.5 (8 reviews)

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Some of our top rated loft conversion companies in Merton

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RS building
Rating: 5 out of 5
Loft Conversion Company in Merton
We’re a highly professional team with over 20 years’ experience in extensions, loft conversions, high-end renovations, new builds, and property conversions. We deliver top-quality work on time and within budget. Our rates are among the most competitive in the UK at £180 per day per man + 10% OHP. With all specialist trades under one umbrella, we can handle projects of any size smoothly—from £20k up to £2m. Happy to discuss your project further
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Latest review:
RS Building successfully delivered two full back-to-brick refurbishments and a new-build development for us in Greenwich, including demolition and construction of four new dwellings. Their level of workmanship is exceptional, and their attention to detail is second to none. As experienced property developers, we’ve worked with many contractors—but RS Building stand out for their reliability, quality, and professionalism. We have since recommended them to several colleagues, all of whom have been equally impressed. Our only regret is not finding them sooner. We look forward to working with them again on future projects.
Reinaldo
Rating: 5 out of 5
Loft Conversion Company in Merton
Hello, my name is Reinaldo Puerta and i owned a building company named Puerta Builders. My team of workers can deliver high standards of finishes, quality and schedules that meet requirements of our client’s expectations. Our company specialises in new construction, refurbishment of existing facilities, loft conversions and house extensions. We are able to offer the lowest rates with greater of quality and services. Puerta Builders looks forward to being part of your Work. Let us help you.
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Latest review:
Carpentry- 16 Apr 2017
For a number of reasons, Reinaldo is without doubt the best tradesman I have come across, After having Cowboy Builders ruin my brand new doors. The quality of his work was faultless, he was prompt, always on time and very efficient, his work and work area was always left clean and tidy, and his communication skills, with regards to problem solving and making sure that the work he was carrying out was to my requirements, was excellent. I gave Reinaldo a number of jobs to do over a few separate visits and was not let down once. I cannot recommend Reinaldo highly enough and will be using him again for any future carpentry & joinery works. Reinaldo is not a carpenter however a magician as he can spell his Magic on any given work with a smile.Thanks again ,Reinaldo great work!
Continental Master Builders Ltd
No reviews yet
Loft Conversion Company in Merton
We’re Continental Master Builders Ltd. family Building Company sets up in June 2005 but we’ve been in building trades since 1998. We specialise in all types of house extensions and alterations, basement excavation and high spect interiors. We can also help with small repairs and emergency repairs around your property.
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Bawabuilder
Rating: 5 out of 5
Loft Conversion Company in Merton
We can extend
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Latest review:
Fencing- 13 Mar 2026
We hired Bawa to install new fencing, and he did a fantastic job from start to finish. You can immediately tell he’s an all-rounder who understands construction very well. The work was carried out efficiently and to a high standard. Bawa has a great attitude, is very hard-working, and clearly takes pride in what he does. Communication was easy throughout, and the whole process felt smooth and professional. It was a real pleasure having Bawa work for us, and I wouldn’t hesitate to recommend him.
Jt building
Rating: 5 out of 5
Loft Conversion Company in Merton
I have been a multi trader for over 12 years, with quite extensive experience working in majority of trade departments from kitchens, bathrooms, tiling, plumbing, doors, windows, joinery, carptentry, first fix, second fix, loft conversions and extensions, have seen through many projects and worked with many people. Can also assist with design ideas/plans as well as build. Happy working with small or large projects, take full responsibility and pride in my work.
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Latest review:
I couldn’t be happier with the work carried out on my home. The tiling on the ground floor, the laminate flooring upstairs, and the kitchen units were all completed to an exceptionally high standard. The attention to detail was outstanding, and everything was finished neatly and professionally. He was reliable, hardworking, and clearly takes great pride in his work. The end result looks amazing and has completely transformed my home. I would highly recommend him to anyone looking for quality workmanship.
BLUELIME CONVERSIONS LTD
Rating: 4.7 out of 5
Loft Conversion Company in Merton
Bluelime is an established planning, design and construction company providing professional property services across London and the surrounding areas. Established in 2007, we have nearly two decades of experience helping homeowners successfully extend, renovate and transform their properties. Our services include architectural design, planning applications, interior design, structural engineering, building regulations, project management and construction. Whether you require assistance with one individual stage or a complete design-and-build service, we provide honest advice, creative solutions and a clear, professionally managed approach from the initial consultation through to completion. We have a strong track record of planning approvals and successfully completed projects. We have also been active on MyBuilder since 2012 and hold a 4.7 out of 5 customer rating, reflecting our long-standing commitment to quality, reliability and customer service. We offer a free initial consultation to discuss your property, understand your requirements and advise on the best way to move your project forward.
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Latest review:
Architecture- 18 Aug 2025
Despite some initial positives, the project was ultimately marred by poor communication, unprofessional conduct & serious breaches of trust. We strongly advise against using Bluelime due to the stress, financial impact, & unresolved issues we faced. While kitchen & bathroom installations were OK & progressed quickly, Bluelime deviated from approved plans in a conservation area, causing compliance issues (estimated correction costs of £15–£20k). Heating & insulation were poorly installed, & second opinions confirmed our dissatisfaction. Communication broke down, with responses defensive and intimidating. Costs rose unexpectedly (e.g. door fitting from £1200 to £2640) & inflated quotes in later stages. The property wasn’t ready for move-in multiple times, disrupting our young family. Additional concerns included missing tools, ignored warranties, inconsistent workmanship & misleading claims about affiliations. We urge others to check Bluelime (Alton Campbell) on Companies House.
PJ house LTD
No reviews yet
Loft Conversion Company in Merton
Experience
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Maisk Developments LTD
New on MyBuilder
Loft Conversion Company in Merton
Professional renovation and building services across kitchens, bathrooms, lofts, extensions, and more
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PAL Build LTD
No reviews yet
Loft Conversion Company in Merton
Hello, future clients! I’m Pawel Rzodkiewicz, and I’m here to provide reliable, high-quality services to meet your needs. Whether you’re looking for. I’m dedicated to delivering exceptional results, paying attention to the smallest details, and ensuring your complete satisfaction. With 15 years of experience in extension and loft conversion , I understand the importance of clear communication and collaboration throughout every project. I’m committed to making the process as smooth and stress-free as possible, always delivering on time and within budget. I look forward to working with you and helping you achieve your goals! Let’s make your project a success together! Best regards, PAL BUILD LTD Paweł Rzodkiewicz
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Ironbark Interiors
Rating: 5 out of 5
Loft Conversion Company in Merton
I have spent the last 15 years working on developing my carpentry skills whilst pushing my design creativity. Creating bespoke kitchens, bedroom, bathroom and all other residential and small commercial Interior work. From concept to design I enjoy and love working with clients to find what is it they really want and what really amazes each of us as individuals. From this point the build to install process is handles with care and passion.
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Latest review:
Tiling- 25 Feb 2026
Job was quoted at a very good price, turned up on time and work was completed to a very high standard! Very happy with the tiling job. Nice tidy work with no mess left behind, would highly recommend Ironbark for your Tiling job.
Apex Plan & Build LTD
Rating: 5 out of 5
Loft Conversion Company in Merton
Apex Plan & Build is your trusted partner in turning vision into reality. Specializing in both domestic and commercial construction, we are dedicated to transforming houses into dream homes and businesses into efficient, modern spaces. With over 30 years of collective industry experience, our team ensures every project is completed to the highest standard, offering expertise in M&E works, including air source heat pumps and MVHR ventilation systems. We also bring cutting-edge innovation to your space with smart home automation solutions like Loxone and Control4, creating environments that are not only beautiful but also intelligent and energy-efficient. Apex Plan & Build is where your dream project is our top priority.
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Latest review:
Very professional and organised. My rear extension renovation was impeccable, thorough knowledge of building regulations with a variety of services to choose from really put me at ease. The venetian plaster feature wall has become the centrepiece of our home.
Focus Build Ltd
Rating: 5 out of 5
Loft Conversion Company in Merton
The priority at Focus Build is to give our customers satisfaction at all times.Focus Build are about being the most professional, timely, efficient and customer orientated building & construction company in Surrey.
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Latest review:
Jack hung doors and completed skirting works for me , his work was neat and to a excellent standard , found him very accommodating when asked to complete works in a short space of time, arrived when he said he would and professional throughout the works, would definitely have him work for me again.
Up and out carpentry and construction
No reviews yet
Loft Conversion Company in Merton
We are a carpentry and contruction company who specialise in loft conversions, Extention’s, refurbishments and undertake all aspects or carpentry. We have a great eye for detail and always aim to deliver the best quality of work.
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RA Designs and Build Ltd
Rating: 5 out of 5
Loft Conversion Company in Merton
We are a dynamic construction firm specialising in innovative design and high-quality building solutions for both residential and commercial projects. With a commitment to excellence and attention to detail, our team of experienced architects, engineers, and skilled tradespeople collaborates closely with clients to bring their visions to life. We prioritise sustainable practices and utilise cutting-edge technology to enhance efficiency and ensure the durability of our structures. From initial design concepts to final construction, we are dedicated to delivering projects that not only meet but exceed client expectations, creating lasting value and aesthetic appeal. Our customers consistently recommend us for our commitment to quality, attention to detail, and exceptional customer service. They appreciate our ability to turn their visions into reality while staying on schedule and within budget. Positive testimonials highlight our professionalism, seamless communication, and the collaborative approach we take throughout each project. Clients feel confident entrusting us with their building needs, knowing that we prioritise their satisfaction and work tirelessly to ensure memorable and successful outcomes.
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Latest review:
Excellent quality of work which has not caused any problems for many years. Efficient work style whilst keeping up a high standard of work.
Marius
No reviews yet
Loft Conversion Company in Merton
I’m hard worker
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Maxcontractorsint.LTD
Rating: 5 out of 5
Loft Conversion Company in Merton
At MaxContractors , we pride ourselves in providing our customers with quality construction services that are tailored to their needs. Our team is highly experienced in the industry and have a great deal of knowledge when it comes to building and renovation. We pay attention to detail and are always willing to go the extra mile to ensure that the job is done to the highest standard. Over the past many years our company has thrived within the domestic as well as commercial building industry. With vast amounts of staff specialising in all areas of the trade, our tradesmen/women boast skill and determination many could only wish of. Having completed thousands of projects, putting smiles on countless of faces we aim to deliver the highest of standards in all aspects of the works and services. Providing quality and great time management throughout each step of this journey. We stand strong beside our clients providing a helping hand so ideas become reality, all while with a peace of mind you kick back and watch your future grow. maxcontractorsint. com
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Latest review:
We recently completed a first and second floor renovation alongside an 5x6m extension of our 1930s property with Maxcontractorsint.ltd , and we couldn’t be happier with the results. From start to finish, they have been absolutely fantastic. The attention to detail and the quality of workmanship throughout the project has been exceptional. Matt and his team are incredible, they worked efficiently, kept work on track, and made sure we were updated and involved at every stage. Their skills, ideas, and collaborative approach truly brought the whole project together. Communication throughout the project was good, and the team provided great pre and post project support. Matt was very detail-oriented, offered inspiration during site visits, and was supportive of our requests along the way. We’re so happy with the end result and would absolutely recommend Maxcontractorsint.ltd for any project.

4.5

Top rated Loft Conversion Companies

Our Loft Conversion Companies in Merton, are rated 4.5 out of 5 based on 8 reviews from customers like you.

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What services are offered by loft conversion companies in Merton?

Converting a loft often entails many jobs - some of which you likely haven’t even considered! Fortunately, a professional loft conversion company in Merton will be able to handle multiple services, ensuring your transformed loft is fit for purpose.

Some of the services loft conversion companies can provide include:

Full loft conversions: Complete design and build projects when structural alterations are needed
Dormer loft conversions: Add extra headroom and floor space with a dormer extension
Velux or rooflight conversions: Ideal for lofts with good existing height; minimal structural change required
Hip-to-gable conversions: Extend the sloped roof to create more usable space
Mansard conversions: A major structural change offering maximum space.
Loft storage conversions: Add flooring, lighting, and insulation for clean, usable storage
Skylight or roof window fitting: Install natural light solutions like Velux windows
Staircase installation: Design and build bespoke stair access to your new loft
Insulation, heating, and ventilation upgrades: Ensure comfort and compliance with energy standards
Design and planning services: Architectural drawings, planning permission, and building regulation approval

Post your job to MyBuilder and you'll be matched with loft conversion companies in Merton who are interested and available to help. And with the reviews of past customers and the freedom to compare the quotes of similar tradespeople, all in the same place, the ball’s in your court.

Average costs of loft conversion companies in Merton

Loft conversions tend to be charged on a project basis, rather than by the hour, as they often involve weeks or even months of work.

The cost of your loft conversion depends on a few things, including the style of loft conversion and materials you choose and the size of your property.

That being said, here are average prices for common types of conversion work:

Full loft conversions: £45,000–£70,000+
Dormer loft conversions: £55,000–£85,000+
Velux or rooflight conversions: £25,000–£45,000
Hip-to-gable conversions: £50,000–£80,000+
Mansard conversions: £70,000–£100,000+
Loft storage conversions: £10,000–£20,000
Roof window fitting or skylight installation costs: £1,000–£2,500 per window
Staircase installation costs: £2,000–£5,000
Insulation, heating, and ventilation upgrades: £2,000–£6,000
Design and planning services: £1,500–£4,000

Take a look at our guide to loft conversion costs to get a more detailed breakdown of the different options available when using a Merton loft conversion company.

Find a loft conversion company in Merton with MyBuilder

When you’re planning major work like a loft conversion, you’ll want to find the right tradesperson for the job. The great news is, MyBuilder has already done all the time-consuming work for you.

All you need to do is post your job on MyBuilder, completely for free, and we’ll share it with loft conversion companies near you in and around Merton.

Step 1: Post your job on MyBuilder

Provide a detailed description of your loft conversion project, including the type of conversion you want, any structural changes, preferred materials, and your ideal timeline. Once posted, local loft conversion companies in Merton can view your job and register their interest.

Step 2: Review and compare Merton loft conversion companies

Browse the profiles of interested loft conversion companies. On MyBuilder, you can view photos of previous projects alongside customer reviews, compare quotes, and see the types of conversions they specialise in.

Step 3: Contact and discuss your project

Once you’ve reviewed local Merton loft conversion companies, you can reach out to those that interest you to ask questions, clarify details, and request more specific quotes. At this stage, be sure to discuss vital aspects like planning permission, design options, and estimated timelines to ensure the company meets your requirements.

Step 4: Hire the right Merton loft conversion company

Once you’re satisfied with their experience, quotes, and approach, you can confirm your hire and start planning your loft conversion.

You can also take a look at our loft conversion specialist hiring guide to help inform your choice. All tradespeople undergo checks at registration - such as verifying ID documents, company details, and certifications for regulated jobs and doing skill assessments - allowing you to hire with confidence.

Questions to ask local loft conversion companies in Merton

Choosing the right loft conversion company for your job requires finding someone who understands your home and your goals.

Find out which company can share your vision by asking the following questions:

What experience do you have with loft conversions in Merton?

A local loft conversion company in Merton will know the types of properties and building styles common in your area, as well as the planning and building regulations that apply. Ask about similar projects they’ve completed locally.

Are you insured, and do you offer a warranty for your work?

Insurance protects your home during the loft conversion process, while a warranty shows the company’s confidence in the quality and durability of their work.

How do you handle planning permission and building regulations?

Established loft conversion companies in Merton should understand local planning rules and building regulations. Ask how they’ll manage permissions, inspections, and compliance to avoid delays or legal issues.

What is included in your quote?

Ensure the quote covers all essential aspects of the loft conversion: structural work, windows or skylights, staircases, insulation, labour, and any additional fees. Understanding this upfront prevents unexpected costs later.

Do you manage the project from start to finish?

Some Merton loft conversion companies offer full project management, coordinating architects, builders, and tradespeople. Others may only handle part of the conversion. Clarifying this early on helps you understand what support to expect.

FAQ: Common questions about loft conversions in Merton

How long does a loft conversion take?

Typically, a loft conversion can take between 6 and 12 weeks, depending on complexity, planning permissions, and any structural work required. Be sure to discuss the timeline with any potential loft conversion companies in Merton before agreeing to start the work.

Do I need planning permission for a loft conversion in Merton?

Many loft conversions fall under permitted development, but some require planning permission, especially if you’re adding a dormer, extending the roof, or living in a listed building. A professional Merton loft conversion company can advise and handle permissions for you.

Will a loft conversion affect my home insurance?

Yes, you’ll need to update your home insurance to cover the conversion. Inform your provider about structural changes, additional rooms, and any changes to utilities or heating systems.

Can I stay in my home during the loft conversion?

Many loft conversions allow you to remain in your home, though noise and dust are inevitable. Some Merton loft conversion companies offer strategies to minimise disruption, but in complex projects, temporary relocation may be advisable.