Loft Conversion Companies in Westminster

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.7 (12 reviews)

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Some of our top rated loft conversion companies in Westminster

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TRIADA BUILDING LTD
Rating: 5 out of 5
Loft Conversion Company in Westminster
Triada Building LTD is a family-run construction company with over 15 years of experience specialising in house extensions, loft conversions, renovations, and new builds. We are committed to delivering high-quality workmanship, completed on time and within budget. From the initial consultation through to project completion, we focus on clear communication, reliability, and attention to detail to ensure a smooth and stress-free experience for every client. Our skilled team of qualified tradespeople takes pride in providing a professional, friendly, and dependable service, with customer satisfaction at the centre of everything we do.
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Latest review:
Met Ibrahim and his Father, we are so glad we ended up picking them to do the work with their team. Top quality from start to finish and always communicating with you (and answering ALL the questions). Very transparent with their pricing everything itemised down to the penny. The Team were so respectful, clean and tidy and very hard working. if you want any upgrades they were always happy to comply and couldn't be more helpful regarding any snagging. I know I didn't make it easy, but my out house looks amazing with my vision and there hard work and determination they absolutely smashed it. This was an exceptionally stress free build. Delivered on time with no hidden costs and kept informed throughout. Lovely people to deal with so would highly recommend Triada Building a professional company. The bar quality is excellent. Ibrahim was professional and personable throughout the entire process - from help choosing the right product, ordering to delivery. I would highly recommend the company, Ibrahim and his team. If I could give more than 5 stars I would I will definitely pass this company on to friends and family. Also happy to show my out house to anyone interested in building one in there garden. Thank you.
AVOTERG Ltd
Rating: 5 out of 5
Loft Conversion Company in Westminster
Our aim is to help clients achieve their objective on time and budget and to the highest standard. We value the good communication with the clients, and try to have as much information as possible with regards to how their project must look when completed.
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Latest review:
The job was a complete refurbishment of a one bed flat, including rewiring and re-plumbing. We would recommend Al and his team without any hesitation. From the very beginning and all the way to completion, we felt very lucky and fortunate to hire them. We found them to be very hardworking, conscientious and professional. The job was a difficult and complex one, but the team still completed within time and within budget. Al's advice made the whole process easier and we found him to be very trustworthy and honest. The end result was better than we originally hoped for and was done to a high standard.
Construction Bushi Ltd
Rating: 5 out of 5
Loft Conversion Company in Westminster
Hi We are a construction company working all over London We are part of the federation of master builders The work we do is, -Loft conversion -Extension -Refurbishe -Decorating -paving -garden
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Latest review:
Extensions- 25 Jan 2022
About halfway through the project now and I have only positive things to say about these guys. They are always on time and hard working, great communicators and pleasant to deal with. The work has been top notch and their quotations have been very fair. I have great confidence things will turn out exceeding my expectations. Will update upon completion.
Joe Does Everything
Rating: 5 out of 5
Loft Conversion Company in Westminster
Joe Does Everything is a professional large-scale building and contracting company. We specialize in everything from loft conversions to refurbishments and extensions. Our experienced and diverse workforce is ready to take on any task, no job is too large. We prioritize client interaction, getting your dream job done as simple for you as possible. Services: Extensions, Loft Conversion, General Building, Full refurbishments, Renovations, Conversations, Bathroom, Roofing, Scaffolding.
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Latest review:
Handyman- 24 Dec 2021
Joe is wonderful in assembling the furniture, he is quick and neat in his work. Does the work in reasonable prices. All in all good experience with him and definitely recommended..
Leo81
Rating: 5 out of 5
Loft Conversion Company in Westminster
I am good at what I do and I'll do my best to get your house to look the way you want it to!
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Latest review:
Restoration & Refurbishment- 19 Apr 2025
Positively, certain aspects of the finishing, particularly tiling, were carried out to a good standard. However, the overall experience was mixed due to significant issues. There were notable challenges during the project involving basic logistics and site management, leading to considerable inconvenience that seemed avoidable. Furthermore, the quality of workmanship was inconsistent; while some parts were good, other areas involving fittings and fixtures showed a lack of attention to detail in the finish, requiring later adjustments. Communication during the process could also be difficult, particularly regarding problem-solving and planning for materials. While we appreciated the parts done well, the project was let down by these inconsistencies and process issues, leading to some ongoing snagging and disappointment.
GMG - Georgian Masters Group Limited
Rating: 5 out of 5
Loft Conversion Company in Westminster
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
4 You Residential Limited
Rating: 5 out of 5
Loft Conversion Company in Westminster
We have over 18 years of experience in residential and commercial refurbishment. We are skilled team of managers, architects, builders and craftsmen, competitively priced and flexible to suit your needs. We specialise in building basements, extensions, loft conversions and carry out full house refurbishments as well as working on smaller projects like kitchens, bathrooms, joinery and fit-out. Our team is energetic, fully insured, certified and recommended by long list of happy clients.
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Latest review:
Groundwork & Foundations- 18 Jul 2019
My wife and I have been truly impressed by Victor and Tom's quick turnaround and willingness to get the job done to an extremely high standard. Their men were friendly, efficient and tidy which is invaluable when taking on any new and daunting property project. As a result of their efficiency we are hoping to work with Victor and his team again in the coming months and would highly recommend them to anyone looking for a reliable and professional contractor.
BSM Interior Ltd
Rating: 4.8 out of 5
Loft Conversion Company in Westminster
Your search for qualified and skilled builders ends here. Made Construction Simple is a team of licensed and insured specialists builders in London with over one decades of combined experience. From extensive loft conversion, extension,refurbishments to bathroom and kitchen renovations, we offer a wide range of services. You can rest assured that we have the expertise to efficiently handle your construction project. Good and dependable work isn’t possible without the necessary qualifications. Every professional on our team is qualified and highly experienced. We undertake all aspects of planning, building and construction services according to the highest standards of workmanship. We prioritise quality, safety and consistency at every step of the way. Our services are compliant with local authority laws and government regulations. We pride ourselves on our exceptional attention to detail. In addition to superior functionality and durability, we don’t forget about how the final result looks. We strive to deliver the best of structural integrity and aesthetics.   Our professional builders go above and beyond to earn your trust. We are dedicated to starting and completing jobs on time for 100% customer satisfaction. If there are any unforeseen delays, you will be promptly informed and kept in the loop. We also ensure that every project is within the specified budget.
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Latest review:
Kitchen Fitting- 9 Jul 2026
I hired Blend for a light house renovation. It started off really well then towards the end he ghosted me. No reason given. He didn’t answer phone calls or texts. There was no fight or disagreement. There is no decent reason why he shouldn’t communicate with a client. You can simply just say you have another job or you are not interested any longer. You don’t ask a client to buy stuff knowing you are not going to show up. It is an unacceptable and unprofessional behaviour. Because of this it’s cost me time that I can’t get back. But I guess it is what it is. I had to find another builder to complete the job. Some of which was not done properly. For example: my kitchen sink was leaking both inside and out. Had to buy a new toilet as something was broken while he was refitting it and etc. Pros: Blend is a nice and easy person to deal with. He is generally a nice guy. Tiling ✅ Cons: Finishing is not so great. could be a lot better. I also found patches and over paint on doors and others.
Stn Contacts Ltd
Rating: 5 out of 5
Loft Conversion Company in Westminster
Should you require a quotation for any works, or even just advice, please call /e-mail us and we will be happy to help you: Basements Extensions Loft conversions New builds Refurbishments Kitchens and bathrooms Carpentry and joinery Roofing Insurance work Design and build
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Latest review:
Stan and his workers are very reliable, professional with there workmanship and very good value for money. Compared with other quotes I received. I had a ground floor and 1st floor extension and a new large kitchen installed and a large bedroom ensuite on the 1st floor.
Jwolfconstruction ltd
Rating: 5 out of 5
Loft Conversion Company in Westminster
My name is George and I'm running J Wolf Construction building company. I can provide a lot references from happy customers in sw London.
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Latest review:
Extensions- 26 Nov 2019
Great on delivery, good on project management....rate them very high on integrity and transparency
Builders Are Us Ltd
Rating: 5 out of 5
Loft Conversion Company in Westminster
With over 10 years’ experience in Loft Conversions, Extensions and Refurbishments, BuildersRUs offer the complete home service. Our dedicated team will help you transform your home, managing all aspects of the process including design, planning, regulations and completed build to the highest specifications. Let us realise your home’s potential, creating your ideal master bedroom, a kid’s gaming room, a quiet home office, or that dream kitchen. Call us today for great work at great prices.
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Latest review:
Bili did a amazing job. He and he's team has been extremely helpful and very professional. Bili listened, made good suggestions, clean and always on time. They finished the job perfectly and on schedule. It was pleasure working with Bili and his team and I would recommend them without hesitation.
KBL Construction Service Ltd
Rating: 4.7 out of 5
Loft Conversion Company in Westminster
we have 10+ years of experience and provide high quality of workmanship in every aspect of building services from refurbishments to loft conversion and extension.we are professional team of skilled builders, tillers, bricklayer, carpenter, painter and provide services for plumbing and electric work.
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Latest review:
Conversions - General- 5 May 2025
Zak and his cousin began working on our project on the 10th of March and delivered everything on time. From start to finish, they were consistent, meticulous, and completely committed to bringing my vision to life. They worked collaboratively with me throughout the process, always open to ideas and focused on achieving the best outcome. Together, they handled everything — brickwork, building, tiling, rendering, plumbing, and electrical — with a high level of skill and professionalism. The quality of their work speaks for itself, and I’ve already recommended them to others. We are truly grateful for all the hard work they put in and couldn’t be more pleased with the final result.
POLISH DECORATING SERVICES LTD
Rating: 4.9 out of 5
Loft Conversion Company in Westminster
We are not the cheapest but we are Master Builders experienced in all aspects of building works including bespoke services. Dedicated team of craftsmen always deliver jobs to the highest standards. We provide full certification for any gas or electrical works. City&Guilds- N.V.Q., P.A.S.M.A. and I.P.A.F. Over 15 years of experience in the UK.
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Latest review:
Extensions- 11 May 2018
After a rogue builder left me with 18 (eighteen) structural issues. Lez and his crew came in transformed my failed extension into a masterpiece. All aspects of the job was done to the highest quality and utmost care and attention to detail was shown to building control needs. They cleaned up after every day and made sure the house was habitable, as I had to live there. Every aspect of the build, from the carpentry, plastering and tiling was first class and their recommend electrician and plumbers were from the same stock. Total professionals. My only regret is that I did not use this builder the first time. The prices were reasonable and even building control had good word to say about their work. Thanks Lez
Top Building Ltd.
Rating: 5 out of 5
Loft Conversion Company in Westminster
Top Building was set up in 2009 to combine the skills of various trades specialists who deliver bespoke projects to customers looking for high quality home improvements. We specialise in kitchen/bathroom & home renovations. We have the equipment & experience necessary for delivering your project.
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Latest review:
Restoration & Refurbishment- 31 Aug 2015
We have had quite a bit of work on our property in the last few years and the final project was to be our bathroom with the focus around a beautiful copper bath which has been sitting in the spare room waiting to be installed for nearly a year. We needed a company that could deliver a very high standard of work at a competitive price. Top building were not only very fair and competitive but wonderfully detailed in their approach both in quoting and their workmanship which is second to none. Vladimir and team understood the project from day one – made a few trips before hand which built the relationship and made myself and my husband very comfortable with our decision to instruct Top Building. What I enjoyed most is that Vladimir made great suggestions and offered money saving advice. Nothing was too much trouble and I really felt the team got behind the project. The knowledge and expertise is of an exceptional level. We had a few odd jobs that needed to be done which the team (Evo and Dimitri) welcomed and efficiently completed. I very much appreciate the patience and flexibility shown by the team and Vladimir’s brilliant way of keeping us informed every step of the way. Bathroom was totally refurbished including new Walls, plastering, electrics, tiling and new boiler. It really has been a pleasure working with the team – I will most certainly be recommending them.
L&G Informations Ltd
No reviews yet
Loft Conversion Company in Westminster
L&G Installations Limited have been established for 14 years. Our main objective is to provide a quality service for our customers. Pride quality work which led to the expansion of the company and employed up to 12 professional fitters/ engineers. The fitters & engineers are trained to a high standard, investing time and commitment on Velfac /Rational Dovista Group & other double glazing products.
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Ranjit singh
No reviews yet
Loft Conversion Company in Westminster
We provide reliable and high-quality roofing and garden maintenance services across all areas . Our team specializes in roof repairs, leak fixing, gutter cleaning, and complete roof installations. Alongside this, we offer expert garden services including lawn mowing, hedge trimming, garden clearance, and regular maintenance. We are committed to delivering affordable prices, fast service, and customer satisfaction. Whether it’s a small repair or a full project, we ensure professional results every time.
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4.7

Top rated Loft Conversion Companies

Our Loft Conversion Companies in Westminster, are rated 4.7 out of 5 based on 12 reviews from customers like you.

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What services are offered by loft conversion companies in Westminster?

Converting a loft often entails many jobs - some of which you likely haven’t even considered! Fortunately, a professional loft conversion company in Westminster 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 Westminster 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 Westminster

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 Westminster loft conversion company.

Find a loft conversion company in Westminster 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 Westminster.

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 Westminster can view your job and register their interest.

Step 2: Review and compare Westminster 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 Westminster 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 Westminster 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 Westminster

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 Westminster?

A local loft conversion company in Westminster 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 Westminster 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 Westminster 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 Westminster

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 Westminster before agreeing to start the work.

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

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 Westminster 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 Westminster loft conversion companies offer strategies to minimise disruption, but in complex projects, temporary relocation may be advisable.