Loft Conversion Companies in Isleworth

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.2 (9 reviews)

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Some of our top rated loft conversion companies in Isleworth

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Signature 1 Construction Ltd
Rating: 4.5 out of 5
Loft Conversion Company in Isleworth
Signature 1 Construction LTD is a family run business with over 25 years experience in the building industry. We specialise in extensions, loft conversions and full house refurbs. Every job we undertake we take great care of the clients house and are experienced project managers will look after you from start to finish.
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Latest review:
Extensions- 30 Sep 2025
Overall, I’m very pleased with the work Marin has carried out for us and I’m currently in the process of instructing him to do more work. Marin built a high spec cedar shed for us with electrics and plumbing, some brickwork and laid composite decking. Marin came across, honest and reliable, which in itself is rare. He was on site most mornings to make sure his tradesmen were on the right tracks. Like with a lot of these things there were some issues along the way and I was highly impressed by Marin’s ‘no quibble’ approach to rectify any problems. I myself have a high attention to detail and am quite indecisive (nightmare client) and Marin was happy to work with me with changes to the project without incurring extra costs.
Ed’s loft conversions Ltd
Rating: 5 out of 5
Loft Conversion Company in Isleworth
We specialise in loft conversions, Extension to a complete house refurbishment.
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Latest review:
I engaged Edi to work on a full renovation and refurbishment of a 4 bedroom detached house with front and back gardens on Blackheath’s Cator Estate. Edi did an extensive amount of work, including stripping out; plumbing; plastering; windows installation; carpentry; and decoration. In addition, after commencing the property work, once the scaffold had been erected, following sensible advice, Edi and his team replaced the roof and fully insulated the attic; fitted additional electric points; rebuilt the garden patio; and replaced the flooring throughout, in addition to other important jobs including re rendering and pointing of chimneys, building new wardrobes in the main bedrooms; and upgrading the radiators. A new kitchen, and two new bathrooms have been fitted. The kitchen redesign meant knocking through a wall with the lounge to create a larger space. Edi is a highly skilled craftsman, who thinks creatively as he works to make best use of the space, including shelf fittings, and additional lighting for example. He has built some beautiful wardrobes, and the internal decorations have brightened up what was previously a rather shabby looking house. In addition to the above, I wish to commend Edi for his professionalism, courtesy, and passion for doing the best work possible. On all the site visits I attended, and every time I spoke with him on the phone, it was striking how much he cared about the work that he was doing, his desire to ensure that the house would look the best. I always left site visits with the feeling that he cared so much about the house that he could be safely relied on to give the best advice to enable us to make the right decisions. I also noticed that Edi and his team would take the upmost care to keep the property safe, tidy and in good shape throughout the project. He can be fully trusted to look after any site he works on. He is intelligent and careful when it comes to safety and security. It has been a pleasure for Edi and his team to work with us over a period of around 6 months, and he did so much to reduce the stress of a significant project so that we could always rely on him to work methodically, patiently and sensibly, and to make best use of the resources available. His pleasantness shines through, and everyone I know who has spoken to him has always provided me with the most positive feedback I have no hesitation in recommending Edi to anyone who wishes to engage him for future projects, and is most deserving of the good words that I and others that work with him have to say about him.
Dominant construction ltd
No reviews yet
Loft Conversion Company in Isleworth
Dominant Construction is a customer centric integrated building company specialising in home renovations, loft and basement conversions, and kitchen extensions. With over a decade of experience, we have designed our processes to ensure that our clients projects run smoothly - always on-time and always on-budget. We keep clear lines of communication at all times to make sure projects are collaborative and executed with our client's needs at the forefront.
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DVK CONSTRUCTION LIMITED
Rating: 4.6 out of 5
Loft Conversion Company in Isleworth
Groundwork Contractors, Foundations, Dredging, Drainage, Excavation, Concreting, Site Clearance, Block Paving, Surveys, Domestic and Commercial Work
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Latest review:
Groundwork & Foundations- 8 Oct 2022
Valentin and his colleague both were very professional, they completed the job on time and cleaned the area after work.
Maxcontractorsint.LTD
Rating: 5 out of 5
Loft Conversion Company in Isleworth
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.
AIA BUILDING CONTRACTORS LTD
Rating: 5 out of 5
Loft Conversion Company in Isleworth
Our Family run business is built purely on word of mouth and on our reputation with genuine authenticated reviews available on our website. we take pride in all aspects of our work from home improvements inside and out, Bathroom Refurbishment, New Roofs, Painting and Decorating, Loft Conversion, Rear Extension, Velux windows, Roof Repair, Gutters and Drain pipes unbloking
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Latest review:
Bathroom Fitting- 25 Mar 2022
Fantastic job very pleased with my bathroom under the stair. Thank you Ben. Pamela Robinson
Visionary Design & Build Ltd
No reviews yet
Loft Conversion Company in Isleworth
Visionary Design and Build is a leading design and construction firm based in London, UK, renowned for its innovative approach and commitment to excellence. Specializing in both design and construction services, Visionary offers comprehensive solutions for residential, commercial, and industrial projects. With a team of talented architects, designers, engineers, and craftsmen, Visionary brings creative vision and technical expertise to every project. They work closely with clients to understand their unique needs, preferences, and budget constraints, ensuring that each design reflects their vision while maximizing functionality and sustainability. From concept development and planning to construction management and project completion, Visionary Design and Build oversees every aspect of the building process with meticulous attention to detail and uncompromising quality. Their dedication to delivering exceptional results has earned them a reputation as one of London's most trusted design and build companies, consistently exceeding expectations and transforming visions into reality.
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Robert Kastrati
Rating: 5 out of 5
Loft Conversion Company in Isleworth
Brick work
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Latest review:
Bricklaying- 18 Jul 2024
Robert is highly professional brick layer, He is polite and communicative. He did excellent job for me. Looking forward to work with his again
TP Infratech Construction Ltd
No reviews yet
Loft Conversion Company in Isleworth
Experienced team of professionals with 10+ years of experience, greater emphasis to Health & Safety, customer satisfaction, quality workmanship, liaison with professionals and councils across London and M25 corridor.
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Rashid
No reviews yet
Loft Conversion Company in Isleworth
Stanwell builder Professional Painter & Decorator 📍 Location: Heathrow London About Me I am a highly skilled and experienced painter and decorator, dedicated to transforming homes and commercial spaces with precision, creativity, and attention to detail. With 3 years of experience in the industry, I take pride in delivering high-quality finishes that enhance the beauty and value of every property. Whether you need a fresh coat of paint, wallpapering, or decorative finishes, I provide reliable and professional service tailored to your needs. Services Offered ✅ Interior & Exterior Painting ✅ Wallpapering & Feature Walls ✅ Wood & Metal Painting ✅ Plastering & Surface Preparation ✅ Commercial & Residential Decorating ✅ Color Consultation & Design Advice Why Choose Me? ✔ Quality Workmanship Guaranteed ✔ Attention to Detail & Precision ✔ Clean, Reliable & Professional Service ✔ Competitive Pricing & Free Quotes ✔ Customer Satisfaction is My Priority Let’s bring your vision to life! Contact me today for a free consultation and quote. Would you like to include social media links or a tagline?
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Mariusz Moniuszko
No reviews yet
Loft Conversion Company in Isleworth
I have had a registered general contracting company since 2004. I have also achieved Master Builder status
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Arka Developments
No reviews yet
Loft Conversion Company in Isleworth
Arka Developments is a London-based design and build company specialising in residential and commercial refurbishment, house extensions, and new build projects across North West London. With a background in architecture and construction project management, we deliver well-planned, high-quality projects with a strong focus on design, cost control, and efficient execution. We offer a fully integrated service from planning and design through to construction ensuring a smooth, transparent process and consistent results. Whether you’re upgrading your home, extending your space, or delivering a development project, Arka Developments provides reliable, hands-on delivery at every stage.
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J N J Building Services LTD
No reviews yet
Loft Conversion Company in Isleworth
JNJ Building Services Ltd provides bespoke building and renovation services for homes in and around North & West London. We deliver innovative and intuitive solutions for our clients, offering a full range of services from design to completion. Our team works together to provide you with a hassle-free service from start to finish. We aim to minimise the disruption a building project can have on your home life with our commitment to punctuality and always working in a clean and tidy environment.
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Hancock Developments ltd
Rating: 5 out of 5
Loft Conversion Company in Isleworth
Builders with over 20 years experience in Building and Groundworks. No job too big or too small. From concept to complete build. Groundworks, Brickwork, Carpentry, Plumbing, Landscaping, Driveways,Patios,Demolitions, Extentions, Interiors, Loft Extensions/Conversions, Clearance, Electrics, Roofing
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Latest review:
Carpentry- 13 Oct 2019
Jake and his brother Robbie are both friendly trustworthy individuals. They completed my loft conversion swiftly and both demonstrated they know what they are doing. Have had them back for other work since and would use again.
General building
No reviews yet
Loft Conversion Company in Isleworth
We work hard and correct
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AlfredM Building Contractors Ltd
Rating: 5 out of 5
Loft Conversion Company in Isleworth
AlfredM Building Contractors LTD Construction company specialising in • Loft Conversions • Extensions • Full House Refurbishments • Domestic & Commercial Building Services • New Build Eager to bring your dream project to life. Dedicated, efficient and passionate.
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Latest review:
Carpentry- 18 Jan 2025
Alfred and his team have done a great job. Replaced the floorboards, joists, installed insulation and damp proofing and sent the extra mile. Highly recommended and I am already using them for a host of other work.

4.2

Top rated Loft Conversion Companies

Our Loft Conversion Companies in Isleworth, are rated 4.2 out of 5 based on 9 reviews from customers like you.

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What services are offered by loft conversion companies in Isleworth?

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

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 Isleworth loft conversion company.

Find a loft conversion company in Isleworth 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 Isleworth.

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 Isleworth can view your job and register their interest.

Step 2: Review and compare Isleworth 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 Isleworth 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 Isleworth 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 Isleworth

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 Isleworth?

A local loft conversion company in Isleworth 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 Isleworth 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 Isleworth 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 Isleworth

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 Isleworth before agreeing to start the work.

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

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