Loft Conversion Companies in St James

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.5 (13 reviews)

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Some of our top rated loft conversion companies in St James

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AP Holloways
Rating: 5 out of 5
Loft Conversion Company in St James
A P Holloway’s Construction Ltd is a leading and reputable Construction Company serving central London, Kent and Surrey. We take on all types and sizes of projects, and cover all aspects of residential and commercial construction.
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Latest review:
Plastering- 5 Sep 2023
Alfie & Paul were very friendly and gave good advice. They were efficient and on time. Did the job on time and within the specified time. I have no problems with their work and would recommend them to others.
Allushi Construction
Rating: 4.6 out of 5
Loft Conversion Company in St James
Hi ! My name is Adrian I been working on construction industry for almost 8 years now! I have a small company with my brother which we call it ’ Allushi Construction LTD’ We undertake any kind of work including: Loft conversation House Extension Full house refurbishment Electrical and plumbing work Painting and decorating Kitchens and bathroom Carpentery work Plastering And many more !
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Latest review:
Restoration & Refurbishment- 2 Jan 2019
Tony and his team were great and we are very pleased with the work they did for us.
Elite Econoloft Ltd
Rating: 3.8 out of 5
Loft Conversion Company in St James
Since 1986, the Econoloft team has been operating nationwide, converting more than 10,000 lofts to date. All of our conversions carry a comprehensive 10 year guarantee, covering workmanship and materials and providing you with complete peace of mind. We have our own in house drawing office and structural engineers. Econoloft will guide you through your loft conversion from idea to plastering.
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Latest review:
Loft Conversion- 23 Apr 2019
A very positive experience. We are not going to say everything was plain sailing. We got there in the end. Arick & Greg, the joiners were especially brilliant. Office communication could be improved at times and the office could be more pro-active. All of the others Duanne, Wesley and Rocky were great. There are a few things ourselves we have to do but now have a extra room in which to live and work. The guys put in long hours and put up with interruptions from our three dogs. Arick & Greg work incredibly hard and put in long hours ; much more then perhaps anyone else we have seen. It is always difficult dealing with things at a distance and we appreciate the office sorting things out when minor issues have arisen (we know they have changed some of their procedures because of us!). Overall it has been a very positive experience. Just glad that soon things will be completely finished and our new floor will no longer be like a building site. We believe we have added value to our house with the help of econoloft and our looking forward to moving in soon.
AH Developments LTD
No reviews yet
Loft Conversion Company in St James
AH Developments Ltd is a professional bathroom fitting and refurbishment company based in London. We specialise in full bathroom installations, tiling, plumbing, and high-quality finishes. We take pride in delivering reliable, clean, and high-standard work, always ensuring customer satisfaction. With strong attention to detail and a commitment to completing projects on time and within budget, we aim to provide a smooth and stress-free experience for every client. Free quotes available.
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KL Interior Architecture Construction and Advertisement Limited
No reviews yet
Loft Conversion Company in St James
KL Interior Architecture and Construction Limited™ has been working in interior design and construction business over the last 20 years. We are ready to serve
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Blueprint Developments Limited
Rating: 5 out of 5
Loft Conversion Company in St James
Welcome to Blueprint Builders, where your dream space becomes a reality. Nestled in the heart of London, our team is at the forefront of design and construction innovation. We specialize in transforming spaces into luxurious living experiences, with services that include: - Elegant House Extensions - Meticulous Loft Conversions - Comprehensive Renovations - Bespoke New Builds And a wide spectrum of commercial and domestic building projects designed with your luxury and comfort in mind. At Blueprint Builders, your satisfaction is not just a goal—it's our promise. We're dedicated to bringing smiles to our clients faces through meticulous attention to detail, unparalleled craftsmanship, and a seamless client experience from start to finish. Stay connected with our journey of transformation on Instagram @blueprintbuilder. Follow us for a regular dose of inspiration through updated photos of our latest projects. Dreaming of a space makeover? Don't wait any longer. Contact us today for a complimentary site visit and a personalized quote. Let's make your vision a living, breathing reality.
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Latest review:
We recently had our 3-bedroom house renovated, along with a new rear extension build and a garage conversion, and I couldn't be happier with the results. The team demonstrated exceptional craftsmanship and attention to detail throughout the project. From the initial consultation to the final handover, they were professional, reliable, and transparent about costs and timelines. The renovation completely transformed our home, enhancing both its functionality and aesthetics. The rear extension seamlessly integrates with the existing structure, creating a spacious and light-filled living area, while the garage conversion provides a versatile space we can now use as an office. The team was approachable, accommodating any changes we requested during the build, and always left the site clean and organized at the end of each day. I was particularly impressed with their ability to stay on schedule despite some challenging weather conditions. If you're looking for a dependable team that delivers quality work, I highly recommend Blueprint.
Safi Building Services
Rating: 5 out of 5
Loft Conversion Company in St James
Having been working in building industry for over 18 years. We provide services in all aspects of building trade from electrical including Electrical Installation Certificate and Electrical Installation Condition Report, Notifying Building Control, plumbing, full renovation, extension and loft conversion. All work fully guaranteed & insured.
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Latest review:
Conversions - General- 24 Feb 2022
Great service from Mohamad. He was on time every day. very hard working and open to feedback on the job. Very happy with the job he done for me on carpentry, building and painting.
Wilde Works Construction
Rating: 5 out of 5
Loft Conversion Company in St James
I am a dedicated and hardworking professional with a strong passion for the construction industry. With a focus on quality, reliability, and attention to detail, I take pride in delivering projects that meet both client expectations and industry standards. My experience has helped me develop a practical approach to problem-solving and efficient project management. My building company is committed to providing high-quality construction services, from small renovations to large-scale projects. We prioritize craftsmanship, clear communication, and customer satisfaction, ensuring every project is completed on time and within budget. Our goal is to build not just structures, but long-lasting relationships with our clients. With over 8 years of experience in the building industry, I’ve developed the skills, knowledge, and attention to detail needed to deliver high-quality results. After years of working within the trade, I’ve decided to take the next step and start my own company, built on reliability, craftsmanship, and customer satisfaction. We take pride in every project, no matter the size, and are committed to providing honest advice and professional service from start to finish. We also offer free, no-obligation quotes, so you can feel confident and informed before getting started.
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Latest review:
Kitchen Fitting- 4 Jun 2026
Very happy with the job completed. Chris arrived on time, worked really hard and cleared away beautifully. I will definitely use him again
JIMGOS Maintenance LTD
Rating: 4.4 out of 5
Loft Conversion Company in St James
Jimgos Maintenance Ltd is a London-based property maintenance company delivering reliable, high-quality services across a wide range of trades. We specialise in residential and rental property works, supporting homeowners, landlords, and managing agents with both reactive and planned maintenance. * Gas & heating – boiler installations, servicing, gas safety certificates (CP12), heating system repairs * Plumbing – leak detection, pipework repairs, bathroom installations, drainage solutions * General building & refurbishment – tiling, plastering, painting & decorating, kitchen and bathroom upgrades We understand the importance of compliance, safety, and clear communication, especially when working within tenanted properties. Our team ensures all work is carried out in line with current UK regulations and industry standards.
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Latest review:
Plumbing- 23 Jul 2026
They were quick and did the job efficiently.
PRASH DEVELOPMENTS LIMITED
Rating: 5 out of 5
Loft Conversion Company in St James
PRASH DEVELOPMENTS LTD specialises in construction of Large Luxury New build Home, HMO & Flat developments, Extensions and Loft conversions We are team of skilled professional with 13 years of combined experiences. We pride ourselves in offering best quality hassle free service with effective pricing and timely delivery. Please feel free to contact us for any construction related information.
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Latest review:
The builders were in time and a great job done in one day when others quoted for 3 days job — all done with great professionalism and satisfaction — will give them 10⭐️
synergic design studio
No reviews yet
Loft Conversion Company in St James
My name is Sanjay Venkatakrishnan and I am an Architectural Assistant (Part 2) with a Master's degree in Architecture (RIBA Part 2) from the University of East London. I have extensive experience working with various architectural software such as Rhinoceros 3D, Autodesk AutoCAD, Autodesk Revit, Lumion, V-Ray, Enscape, and Adobe Creative Suite.
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ABC building and carpentry
No reviews yet
Loft Conversion Company in St James
Hi there my name is Ben Chapman, Im am experienced carpenter with 17 years in the building industry. Myself and my team cater for all aspects of work from bespoke carpentry and kitchen fitting, loft conversions and extensions. We pride ourselves on being professional, provide a good quality of workmanship and most of all punctual.
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a-z renovations and construction
No reviews yet
Loft Conversion Company in St James
My name is Avni, Our company is called 'a-z renovations & construction' we take all different kind of projects whether they are small or big. all of our jobs are mainly recommended. our jobs are: Extensions, loft conversions, mezzanine floors, plastering and plumbing, wall & floor tiling, painting and decorating, kitchen and bathroom fitting, carpentry, patio and garden fixing. we cover London and home counties.
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FDT Construction Services Limited
No reviews yet
Loft Conversion Company in St James
Construction company specialising in home extensions, loft conversions, patios, driveways and other construction services. You name it, we are here to help!
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SEDCO Structural Consultants Ltd
No reviews yet
Loft Conversion Company in St James
Dreaming of extra space in your home? Whether it's a larger kitchen, a new bedroom or a larger and spacious living area, a house extension can transform your living space and enhance your quality of life. At SEDCO, we cater to your contsruction needs with expertise. We are all about maximising your living space and making your dream and ideal home, a reality! Weather you're considering knocking down a wall, converting your loft space, extending into your rear garden or diving into a brand-new build adventure, we're here to help you every step of the way. Our Services Include: - Architectural Design - Planning Permission - Structural Engineering Consultants - Structural Reports - Party Wall Matters - Project Coordinators - Building Construction Services Operating in London and its suburban areas, we pride ourselves on our commitment to deliver exellence and customer satisfaction. Whether it's a residential renovation or a commercial development, we bring expertise, reability, and integrity to every project. Are you ready to embark on your next construction venture? Contact us today to schedule a complimentary consultation with one of our construction specialists. Let's turn your vision into reality, together.
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Ava Constructions & Decors
Rating: 4.9 out of 5
Loft Conversion Company in St James
Ava Constructions & Decors Ltd is a UK-based construction and renovation company committed to delivering top-quality craftsmanship and reliable project management. We specialise in full refurbishments, extensions, bathroom and kitchen installations, and commercial fit-outs — always tailored to the client’s vision and delivered to the highest UK building standards. With a keen focus on transparency, timelines, and customer satisfaction, Ava Constructions has earned the trust of homeowners, investors, and developers alike. Punctuality and completion of work on time are a priority .Our team always respect the client wishes and work with them to achieve the best possible results to their satisfaction. Thank you in advance
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Latest review:
Extensions- 16 Apr 2026
I would not recommend this builder based on my experience. Instead of using crushed concrete they used soil to fill the house flooring for underfloor heating. 1 The project suffered from poor communication, repeated delays, and a lack of clarity around responsibilities. There were serious issues with the foundation works, which failed Building Control inspection and now require remedial engineering input before works can proceed. The site was also left incomplete and not in an acceptable condition. Despite substantial payments being made, key documentation, technical responses, and follow-through were lacking, leaving me to resolve major compliance and structural issues independently. My experience has resulted in delay, additional cost, and considerable stress. I would strongly advise others to ensure there is a detailed written contract, clear scope of works, and defined accountability

4.5

Top rated Loft Conversion Companies

Our Loft Conversion Companies in St James, are rated 4.5 out of 5 based on 13 reviews from customers like you.

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What services are offered by loft conversion companies in St James?

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

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 St James loft conversion company.

Find a loft conversion company in St James 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 St James.

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 St James can view your job and register their interest.

Step 2: Review and compare St James 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 St James 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 St James 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 St James

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 St James?

A local loft conversion company in St James 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 St James 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 St James 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 St James

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 St James before agreeing to start the work.

Do I need planning permission for a loft conversion in St James?

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