Loft Conversion Companies in St James

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.4 (12 reviews)

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Some of our top rated loft conversion companies in St James

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Brits construction ltd
Rating: 5 out of 5
Loft Conversion Company in St James
Brits has vast knowledge & experience of residential projects and has built several Modern Loft conversions, Major Side & Rear Extensions and whole house Internal Refurbishments. We Offer; Project Management. Program of works. Regular Meetings with the client. Liaise with the local authorities. We execute Projects on time, within budget and with the highest quality. Best housekeeping and H&S Standards. Employees & Public Liability Insurances. Member of FMB, LABC, Trust Mark, NABC
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Latest review:
Extensions- 21 Jul 2023
We had a loft conversion and a 9x3m rear extension constructed. We also had underfloor heating, flooring, a new staircase and air con installed. We are happy with the result and would recommend this company. They have also respected warranty and fixed issues that have come up after construction and decorating work completed.
Davit Okropilashvili
No reviews yet
Loft Conversion Company in St James
Hi, I’m Davit Okropilashvili.Together with my skilled team, we specialize in providing top-quality refurbishment services tailored to your needs. We take pride in our craftsmanship and attention to detail, ensuring your space is transformed exactly how you envision it. Let’s create something amazing together!
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NORTH STAR BUILDING SOLUTIONS LIMITED
Rating: 5 out of 5
Loft Conversion Company in St James
Established in 2010 Northstar Building Solutions are a highly successful building company specializing in exceptional residential projects. As well as covering all aspects of new build and can deliver technical expertise to the latest building designs. We pride ourselves in completing a variety of projects including affordable and high specification housing, energy centres, hotels, restaurants, community centres and a church; we are experts at Extensions, Conversions.
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Latest review:
Extensions- 2 Jan 2023
Excellent work overall. Builders were very professional, hardworking and friendly. Work was completed to a high standard and we were given updates throughout the entire process. Leo and his team were very responsive and resolved issues very quickly. Will 100% use North Star again for future work.
Making Rooms Ltd
Rating: 5 out of 5
Loft Conversion Company in St James
We are a south London-based building firm that specialises in breathing new life into homes. We work closely with our clients,alongside visionary architects, engineers and designers to unleash potential in their house and realise new and improved spaces. Whether your house requires expansion,our team of specialists work tirelessly to deliver the perfect home for you. Making Rooms are a group of passionate and multitalented individuals whose soul mission is to make your living spaces better.
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Latest review:
Loft Conversion- 22 Apr 2017
We chose Making Rooms because Steve really took the time to understand what we wanted from our loft conversion, and sat with us to go through all of the options and discuss our questions. The end result is beautiful - we couldn't be happier with our loft conversion. Steve's team were hard working and very personable. Big recommendation from us!
A S Builders
Rating: 5 out of 5
Loft Conversion Company in St James
I Have more then 14 years experience as a builder. My team is committed to handling every job small or big with complete dedication and hard work. We believe in giving our customers the best value possible, ensuring outstanding quality of workmanship and offering a friendly experience from start to finish. We do Extension,loft,structure work,plastering,bathroom and kitchen Refurbished
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Latest review:
Loft Conversion- 22 Jul 2018
Loft conversion job completed to a very good standard. No issues with building control. The AS builders team were very professional and showed very good customer service. I will definitely use again for other building work.
RD PAINTING & RENOVATIONS LTD
No reviews yet
Loft Conversion Company in St James
RD Painting & Renovation provides professional painting and renovation services for homes and businesses. We handle everything from interior and exterior painting to repairs and remodels, always focusing on quality, reliability, and customer satisfaction. Our goal is to make every space look its best and meet the unique needs of each client.
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Top Finish Ltd
Rating: 4.6 out of 5
Loft Conversion Company in St James
We are a property refurbishment specialists with a wealth of experience in house extensions,basements,loft conversions,bathrooms kitchens and much more. We have built a reputation on the basis of providing clients with a quality service that is combined with excellent value for money. .
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Latest review:
Loft Conversion- 2 Jul 2016
Top finish were ultimately hired to conduct this work. There was admittedly some job creep in this project. Alan came round and discussed our intentions and suggested a possible route forward. An architect (Red Squirrel Architects) was independently retained by us to work with the Top Finish team to deliver a Dormer conversion reorganization and significant structural works for a side return extension and installation of a new kitchen (13 steels were inserted and a sewer had to be bridge over, with permission) The job was completed to a high specification, particularly given some of the problems thrown at the team when dealing with a 150yr old property. I think it's important to understand that when undertaking jobs of this scale, and if you are planning to live in the property as we did, then you are effectively living with the team you chose. To that avail- ALL of the top finish team were always considerate and a pleasure to be around and happy to fix any concerns rapidly as required. I wish Alan and his team all the best going forward and I would recommend meeting Alan and including him in your shortlist for any job - large or small.
The Gate Property Management
No reviews yet
Loft Conversion Company in St James
Welcome to The Gate PM – Your Trusted Partner for Complete Home Transformations 📍 Where we work: We cover the wider London metropolitan area, bringing our reliable service to homeowners across London and the surrounding regions. 👷‍♂️ Our experience: With years of hands-on experience in the construction industry, we have successfully completed countless projects ranging from small refurbishments to full-scale extensions. Our portfolio includes everything from listed building renovations to modern loft conversions and new-build extensions. 🛠️ Our special skills: We offer a true one-stop shop for all your building needs. Our in-house team covers: · Full renovations and refurbishments · Extensions, loft conversions, and conservatories · Kitchens, bathrooms, and plumbing · Roofing, flooring, plastering, and tiling · Porch, driveways, and external landscaping · Electrical installations and rewiring · Painting and decorating ✅ Why hire us: We believe in honest communication, transparent pricing, and exceptional craftsmanship. Every project is managed personally from start to finish, ensuring quality control and peace of mind. We're fully insured, pride ourselves on cleanliness and reliability, and won't leave.
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Simply Extensions and Lofts Ltd
No reviews yet
Loft Conversion Company in St James
We're specialist’s in house extensions, refurbishments and Loft conversions in South London and all surrounding suburbs, with the aim to deliver. Everyone that we use for finishing, is a trade. This gives you a very high quality finish that is seldom achieved by a 'General-trade'. We are fast, clean and produce showroom quality. Our individual professionals are more than just people we work with, they are people we know. We make or exceed our deadlines to ensure client satisfaction!
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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.
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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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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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.
Home improvement
Rating: 3.4 out of 5
Loft Conversion Company in St James
“Reliable handyman with 7+ years of experience in flooring, plastering, and general home repairs. I take pride in clean work, clear communication, and finishing jobs on time. Available for small to medium projects — no job too small!
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Latest review:
Handyman- 25 Jun 2026
Do not hire this individual whatever you do. He is highly unprofessional and condescending when you try to ask him any questions, he clearly doesn’t know what he is doing and just wings it. Always makes out the fault lies with wall or the part but never his lack of skill/competence. He fitted the bracket wrong way round and when I told him this he denied it until he was forced to face facts. The tv is tilting forward and he told me that’s how it supposed to be when the diagram says otherwise and it is supposed to rest flat on the wall. I now have to pay a competent person to come and fix his mistakes! I would give him 0 stars if I could! Avoid like the plague!!!
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.

4.4

Top rated Loft Conversion Companies

Our Loft Conversion Companies in St James, are rated 4.4 out of 5 based on 12 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.