Loft Conversion Companies in Mortlake

Name: Loft Conversion Company
Brand: MyBuilder
SKU: loft-conversion-company
Rating: 4.3 (10 reviews)

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Some of our top rated loft conversion companies in Mortlake

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Z3 Construction ltd
No reviews yet
Loft Conversion Company in Mortlake
We understand that construction is more than just building—it’s about creating spaces that are functional, durable, and perfectly suited to your needs. That’s why we take the time to plan carefully, communicate clearly, and work efficiently from start to finish. Whether you’re upgrading a single room, expanding your property, or starting a project from the ground up
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Safeway Build Ltd
Rating: 5 out of 5
Loft Conversion Company in Mortlake
At Safeway Build Ltd, we pride ourselves on delivering exceptional craftsmanship and reliable service in every project we undertake. Led by Florin, a highly trained professional with over 20 years of experience in the construction industry and a proud member of the Federation of Master Builders (FMB) since 2014, our company is built on trust, quality, and attention to detail. Working alongside trusted electricians and plumbers, we offer a complete service that ensures every aspect of your project is handled with care and expertise. Much of our success has come from referrals and repeat clients, a testament to the satisfaction and confidence our customers have in our work. At Safeway Build Ltd, we don’t just build — we build lasting relationships, turning your vision into reality with professionalism, transparency, and dedication. Whether you are looking for loft conversions, extensions or a refurb, all our services are carried out carefully, efficiently and to an exceptionally high standard of quality. We are happy to undertake any domestic work. At Safeway Build Ltd, no job is too big or too small.
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Latest review:
Kitchen Fitting- 10 Feb 2026
Florin and team were a joy to work with. Very communicative and worked to a great timeframe. Lots of little extra jobs were completed at no extra charge. Cost for job was reasonable and the tiling was immaculate - would definitely use Florin again. Would highly recommend!
Loft fitter, carpenter
No reviews yet
Loft Conversion Company in Mortlake
Loft fitter with 20 years experience. High quality and reasonable prices.
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Espe Construction Limited
No reviews yet
Loft Conversion Company in Mortlake
With more than 20 years in the construction trade, we specialise in high-end residential projects. Whether it’s loft conversions, small extensions, large-scale double-storey extensions, or basement digs in prime London locations, we deliver exceptional craftsmanship and meticulous attention to detail. Operating across the M25 area, we provide homeowners with reliable construction services, managing projects of all sizes and complexities from initial design through to final completion, with efficiency and expertise. As a proud member of the Federation of Master Builders, TrustMark and an approved installer of Wykamol waterproofing systems, we are committed to maintaining the highest standards of work and customer service. We work closely with clients to provide bespoke solutions tailored to their needs, ensuring that the end result enhances both the home’s functionality and its value. We specialise in: Loft conversions Extensions (including double-storey builds) Basement excavations Design & build services High-end finishes We prioritise quality, integrity, and customer satisfaction. Our transparent communication, punctuality, and commitment to budget-friendly, on-time delivery make us the ideal choice for your construction project.
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StructurAll Ltd
No reviews yet
Loft Conversion Company in Mortlake
We started our company as an engineering consultancy. We developed over the years to provide in-house architectural services, interior design, structural design, project management and asset management capabilities. We believe in client service and support throughout the life of a project, rather than just providing a design solution. So we have gained a reputation of being a one-stop-shop amongst our clients; who include private individuals, contractors, and local authorities.
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AVOTERG Ltd
Rating: 5 out of 5
Loft Conversion Company in Mortlake
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.
Mbalau Construction LTD
Rating: 5 out of 5
Loft Conversion Company in Mortlake
Builder with 20 years of experience . I provide a wide range of building services such as: loft conversion, extensions,bathroom refurbishment,house refurbishment , plumbing and electric etc . I have the tools,knowledge and team to build a house from start to finish . I can provide references and pictures of previous work upon request .
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Latest review:
Complete refurbishment of 2 bed 1100 sq ft flat. Including removal internal walls Ripping out and renovating 2 bathrooms. Involving new layout replumbng and relocation of #electrics. Tileing Preparing and laying wood flooring throughout. Fitting shelving and book case. The work over 2 months involved all building skills. Throughout Marcel and his highly skilled crew were efficient clean and resourceful. I would highly recommend for all building and decoration work.
Builders Are Us Ltd
Rating: 5 out of 5
Loft Conversion Company in Mortlake
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.
Asllan Alla
Rating: 5 out of 5
Loft Conversion Company in Mortlake
My name is Asllan Alla , i am an experienced roofer that can handle all kind of roofing . I could advise as well on how much materials would be needed .
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Latest review:
Roofing (Pitched)- 15 Jun 2024
Asllan was exceptionally hardworking, clean, tidy and professional. His attitude was polite at all times and the quality of his work is brilliant. I will have no problem in hiring him for more roofing/guttering works in the future. Thank you Asllan.
MJV Extrem Construction Ltd
Rating: 5 out of 5
Loft Conversion Company in Mortlake
MJV Extrem Construction specializes in refurbishments, extensions, loft conversions, new builds and complicated structural alterations.We are ready to help with any of electrical,plumbing and Gas desigh and installations included all aspect of different heating systems and UFH systems. We also undertake smaller projects like kitchen/bathroom Installation’s ,gardening and all your property needs from A to Z. Fully insured. Free quotations
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Latest review:
Plastering- 20 Jun 2025
Rerendering, repairing and redecorating front of house. Vic and his team were excellent. Highly skilled, respectful and trustworthy. Job was completed to a very high standard at a fair price. Couldn’t be happier. Will definitely use him again and would not hesitate to recommend him to others.
Vasi Paint
No reviews yet
Loft Conversion Company in Mortlake
Hi,my name is Vasile. I have 15 years experience in general building,painting,decorating and plastering. Please feel free to contact me. Serious and reliable.
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Copperoak Construction
No reviews yet
Loft Conversion Company in Mortlake
I'm a qualified carpenter for 18 years and have also picked up a host of other skills. Not only can I build you a new loft conversion and everything associated with it but I can also fully fit your kitchen, and bathroom including all associated plumbing and tiling. I have extensive experience in all aspects of the building trade and complete any task big or small.
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A&A Construction
Rating: 5 out of 5
Loft Conversion Company in Mortlake
A&A CONSTRUCTION has served north west London for over 10 years,we offer a complete home improvement package from design to completion.
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Latest review:
Painting & Decorating- 18 Dec 2025
Full paint of 2 bedroom flat completed to a high standard. Would recommend.
FBF Construction Ltd
Rating: 5 out of 5
Loft Conversion Company in Mortlake
We take all types of jobs from demolish a house and rebuild at the highest standards.
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Latest review:
Florin extended and completely refurbished our 4-bedroom semi-detached house. This included extensive steelwork, underfloor heating, complete re-plumbing and rewiring, excavation, and an entirely new slate roof as well as varying extensions up to three floors high. I cannot say enough good things about his workmanship, professionalism and reliability. His workmanship makes a perfectionist like myself happy. He is also completely professional: even with our difficult neighbours he was always courteous and understanding, and even helped them sort out issues at a moment’s notice that had nothing to do with his building work on our property. And he is also thoroughly reliable. I cannot think of any instance where he committed to something and did not deliver — he even managed to finish all the work on our house ahead of schedule and on budget. We have been so happy with his work that we contracted him to build us a summer house as well, from scratch, and to complete revamping our front garden including elements of hard landscaping. Again he delivered flawlessly and we are very happy with the result. We also continually receive positive comments from people passing by and just seeing the front garden. We have used several other builders in the past on other properties, including far more expensive ones, and none compare to his level of competence, attention to detail in his workmanship, his complete professionalism and thorough reliability. Now that we have found Florin, we will never look for another builder again. I just hope once others experience what he delivers for themselves he will still have some availability for us in the future!
J N J Building Services LTD
No reviews yet
Loft Conversion Company in Mortlake
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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Constructum Code Ltd
Rating: 4.2 out of 5
Loft Conversion Company in Mortlake
****** Constructum Code building company ****** We offer various construction services, from fence building to renovation work, extensions, home building and loft conversions. We also provide a wide range of interior building and renovation services. We have highly qualified project managers with over 22 years of experience in construction & building industry. WE OFFER: *The Complete Service* *10 Year Guarantee* *Free Estimates* *Competitive Prices* *Full Building Control Approved Installer* *Excellent Designs and Unbeatable Workmanship* *Fully insured building service* Constructum Code, at its core, is a construction company through and through. We are general contractors who can provide a wide range of building services, both small and large. Services Provided: 3D Rendering, Basement Conversion, Building Design, Complete Bathroom Renovation, Complete Kitchen Renovation, Conservatory Design & Installation, Custom Build Homes, Home Renovation, House Extensions, House Plans, House Restoration, Interior Architecture, Interior Design, Loft Conversion, Loft Restoration, New Home Build, Project Management, Balcony Design & Construction, Concrete Construction, Concrete Repair
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Latest review:
I ordered repairs from the Constructum Code company, I wanted to create a play area. The guys tried to select all the materials and work technologies to suit my budget. The tiles on the walls and floor were laid well. The work was completed efficiently and on time. I recommend this company...

4.3

Top rated Loft Conversion Companies

Our Loft Conversion Companies in Mortlake, are rated 4.3 out of 5 based on 10 reviews from customers like you.

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What services are offered by loft conversion companies in Mortlake?

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

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 Mortlake loft conversion company.

Find a loft conversion company in Mortlake 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 Mortlake.

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 Mortlake can view your job and register their interest.

Step 2: Review and compare Mortlake 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 Mortlake 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 Mortlake 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 Mortlake

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 Mortlake?

A local loft conversion company in Mortlake 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 Mortlake 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 Mortlake 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 Mortlake

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 Mortlake before agreeing to start the work.

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

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