Loft Conversions in Brighton & Hove

Transform unused attic space into a stunning new bedroom, office, or living area

Get a Free Loft Conversion Estimate

What’s Included in Our Loft Conversions

Full Design & Planning

Complete architectural drawings, structural calculations, and planning support to ensure your loft conversion is fully compliant and ready to build.

Structural Work & Steel Installation

All required RSJs, flooring reinforcement, and structural changes installed to meet building regulations and create a safe, solid living space.

New Floor Construction

Strong, level flooring with proper insulation, acoustic protection, and seamless integration into the existing structure.

Dormers & Roof Alterations

Construction of dormers, hip-to-gable conversions, or roof adjustments to increase head height and maximise usable space.

Windows, Skylights & Natural Light

Installation of Velux windows, dormer windows, or skylights to bring in natural light and improve ventilation throughout the new room.

Insulation & Fire Safety

Thermal insulation, fire-rated doors, smoke alarms, and compliant escape routes installed to meet all safety regulations.

Electrical, Heating & Plumbing

Full electrics, radiators, underfloor heating, and optional en-suite plumbing — installed by certified specialists.

Plastering & Internal Finishing

Smooth plastering, skirting, doors, and full finishing to prepare the space for decorating and furnishing.

Rubbish Removal & Final Clean

All construction waste removed and a full clean carried out so your new loft room is ready to enjoy immediately.

Rainbow Building Plumbing & Electrical Services place picture
Rainbow Building Plumbing & Electrical Services
5.0
Based on 34 reviews
review us on
Peter W. profile picture
Peter W.
2 months ago
Large External Painting and Decoration & Maintenance Competitive price, with fast and efficient work. Have used them for many years and will use again.
Justin M. profile picture
Justin M.
2 months ago
We engaged Rainbow to renovate our shower room. Very, very easy to work with - helpful with advice and support about what we needed to get done. Mark and Max were great - you couldn't ask for friendlier people. We had some teething issues (NOT the fault of Rainbow) which Rainbow helped to rectify and get the job complete. Recommended and we'd certainly use their services again.
Tina W. profile picture
Tina W.
8 months ago
The contractors were extremely professional and prompt. They explained everything they were doing throughout the process and I am extremely pleased with the quality of the work
Clara G. profile picture
Clara G.
8 months ago
We went to Rainbow building to get some work done in our kitchen before we could get a new kitchen fitted in. They did wonderful work and let us know of any issues or complication we would face. Mark and Max especially were really nice and we're really happy with the partial wall removal, tile removing and replastering work they did for us!
Louise P. profile picture
Louise P.
9 months ago
Great communication, friendly team. Flexible when I had delivery delays.
Dan G. profile picture
Dan G.
10 months ago
The Rainbow team first did some excellent work for us 10 years ago. And they have just finished some renovations in the last week, which has gone really smoothly. Kev is a great communicator, always able to offer his expert opinion on the work required and then gets the job done. The best in Brighton.
Graeme C. profile picture
Graeme C.
10 months ago
Needed a complete flat refurbishment to include new Kitchen, Bathroom, Flooring, Electrics, Plumbing and Decorating etc. Wanted a local contractor to take control of the whole project rather than trying to juggle lots of different Trades myself. Rainbow (Mark in particular) were able to manage the whole project from start to finish and totally transformed the place, as shown in the photos. I was particularly impressed with the Kitchen so a special shout out to Stephen
Johanna D. profile picture
Johanna D.
11 months ago
We had a great experience with Kev, Mark and their team. Our bathroom was gutted and then totally refitted, and the result looks brilliant! They were really communicative throughout the process, offered recommendations, and worked hard to resolve issues which popped up. Would definitely recommend. Thanks so much!
Daryn C. profile picture
Daryn C.
12 months ago
We’re absolutely delighted with our new bathroom. Kevin, Mark and the team transformed an old, tired space into a clean, modern and relaxing room that’s a real joy to use. There were a few unexpected challenges along the way, but everything was clearly explained and managed, so there were no nasty surprises with the budget. They were also very considerate of our circumstances at home, which made the whole process much easier. Professional, tidy, and great communication throughout – highly recommended!
Manda S. profile picture
Manda S.
1 year ago
Steel Beam Works / Plastering / External Render / Carpentry / Window Fitting We have used Rainbow several times over the years and always had excellent workmanship. This was our biggest work and we were a bit nervous but Mark and the boys were extremely capable, curteous and considerate. We were living on site and they did their best to mitigate dust affecting our living area. We also didn't have to endure a radio playing the same music again and again! They were also very reliable. Now they have gone, we actually miss them!
Rowan B. profile picture
Rowan B.
1 year ago
Another fantastic job completed at the property, this time a new kitchen fit. Mark, Kev and the wider team were fantastic every step of the way - very responsive and amazing attention to detail. Would highly recommend their services.
Stephen F. profile picture
Stephen F.
2 years ago
Good
emma L. profile picture
emma L.
2 years ago
Friendly, reliable and willing to take on smaller jobs as well as larger ones. The work was of a high standard and communication was clear and simple. I wouldn’t hesitate to happily recommend Rainbow and will certainly use them again in the future.
Tilly U. profile picture
Tilly U.
2 years ago
From the very first on-site meeting with Kevin Viney at Rainbow Building Plumbing & Electrical Services we were confident in the advice given, and suggestions made. Major building renovations are a daunting task, so with Rainbow we felt we would be in safe hands if we engaged them. And we weren’t disappointed. Throughout the project those things that were most important to us were achieved, many requiring precision down to the millimetre. And when unforeseen issues arose, as they do in older buildings, whilst these caused us some sleepless nights, Rainbow confidently dealt with them enabling us to return to calm and carry on. Mark Burns, the builder and project manager, has been amazing with his wide knowledge, craftsmanship, and meticulous attention to detail - and his calm manner under pressure, has resulted in every aspect of the work carried out by Rainbow to be of a high standard and the best it could be. Thank you Rainbow - and if ever we are crazy enough to embark on another renovation project we would definitely be calling you to see it through.
John L. profile picture
John L.
2 years ago
Rainbow have carried out a complete refurbishment of my flat to an impeccable standard. They also landscaped the garden. Both look unrecognisable and I wouldn't hesitate to recommend Kev, Mark, Steve and the others at Rainbow.
Photo from customer reviewPhoto from customer reviewPhoto from customer reviewPhoto from customer reviewPhoto from customer review
Danny M. profile picture
Danny M.
2 years ago
Hi there - we have just had our kitchen fitted by Rainbow, and I would heartily recommend them to anyone else in Brighton. They were super organised, friendly and easy to communicate with, got the job done quickly AND it looks really good! Definitely good value for money as well! Cheers Danny
Teresa L. profile picture
Teresa L.
2 years ago
A trustworthy and responsive Building Company? Yes, it is rare but Rainbow fits the bill. Kev and his staff/contractors know their stuff. Kev was always responsive and reliable when contacted - a big plus in my book - and his workers left the place as clean and tidy as possible after a major structural work. Definitely recommend
andy B. profile picture
andy B.
2 years ago
I have nothing to say bad about these guys - Kev and his team are awesome they did an amazing job of knocking through out kitchen and dining room - putting in new steels and installing a new kitchen - Mark was project manager and i have not met a nicer guy who talked us through every step of the way Gary the plumber was amazing - Steve the Carpenter was utterly brilliant - and Danny the tiler super quick and awesome :) would def recommend to anyone - plus getting them back to do our new bedroom and ensuite later this year :)
Claude L. profile picture
Claude L.
3 years ago
Went above and beyond will always use again
Aliénor D. profile picture
Aliénor D.
3 years ago
My go to guy as of now . Boiler swapped in one day for cheap

Thinking About a Loft Conversion?

Unlock the full potential of your home with a professionally designed and built loft conversion. Extra bedrooms, offices, and living space — tailored to your lifestyle.

Get a Free Loft Conversion Estimate

Why Clients Trust Rainbow for Loft Conversions

🏗️

Expert Structural Work

From RSJs to new flooring systems, every structural component is installed safely, accurately, and in full compliance with building regulations.

📐

Design That Maximises Space

We create loft layouts that boost head height, natural light, and usable living space — whether you choose a dormer, hip-to-gable, or Velux conversion.

📋

Clear, Transparent Estimates

You’ll receive a detailed, easy-to-understand estimate covering all works — from design and materials to structural changes and finishing.

When You Might Need This

You want to create an extra bedroom, office, or living space without extending outward
Your loft is currently unused or poorly insulated and could be converted into usable space
You need more headroom and are considering a dormer or hip-to-gable conversion
You want to increase your home’s value with a high-return renovation project
You’re preparing for a growing family and need more functional rooms
You want a professionally built loft conversion that meets all building regulations

How We Work

1

Request Your Estimate

Click "Get a Free Estimate" to tell us about your loft conversion plans and arrange a convenient site visit.

2

We Visit Your Property

We inspect the loft structure, head height, access points, and discuss layouts, roof types, and the best conversion options for your home.

3

Receive a Detailed Estimate

You'll receive a full breakdown covering design, structural work, insulation, electrics, plumbing, finishes, and any planning or building control needs.

4

Your Loft Conversion Begins

We carry out all work professionally and to spec — from steel installation and dormer construction to plastering, electrics, and final finishing.

📋 Important: Required Documentation for Accurate Estimates

To produce an accurate estimate, all three of the following latest versions of the documentation must be provided, along with their associated version numbers, project/drawing numbers, and dates:

  • Latest Architect drawings (must include Version number or Drawing/Project number, and Latest Date).
  • Latest Structural drawings (must include Version number or Drawing/Project number, and Latest Date).
  • Latest Building / Materials notes or drawings (normally found attached to the Architect drawings or on separate notes; must include Version number or Drawing/Project number, if applicable).

Transform Your Loft

From extra bedrooms to home offices, our loft conversions are designed for space, style, and comfort. Book your free consultation today.

Get a Free Loft Conversion Estimate

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Loft Conversion FAQs

Do I need planning permission for a loft conversion?

Most loft conversions fall under permitted development, but there are size and height limits. We'll help you check local planning rules.

What types of loft conversions do you build?

We build dormer, hip-to-gable, mansard, and Velux loft conversions, customised to your home's layout and your needs.

How do you ensure structural safety?

All conversions follow UK building regulations, with proper joist reinforcement, fire safety, insulation, and structural inspections.

Will the work be disruptive?

We minimise disruption where possible. Most loft conversions take a few weeks, and we keep the site tidy and safe throughout.

What documents are strictly required before an estimate can be produced and agreed?

To produce an accurate estimate, all three of the following latest versions of the documentation must be provided, along with their associated version numbers, project/drawing numbers, and dates:

Latest Architect drawings (must include Version number or Drawing/Project number, and Latest Date).

Latest Structural drawings (must include Version number or Drawing/Project number, and Latest Date).

Latest Building / Materials notes or drawings (normally found attached to the Architect drawings or on separate notes; must include Version number or Drawing/Project number, if applicable).

How do I get started?

Request a free estimate and we'll arrange a visit to assess your loft, discuss options, and provide clear pricing.