Turn the space above you into the room you actually need
From the first measure-up to the final coat of paint, Red Loft Extension manages every stage of your loft conversion in house — design, planning, structural work, and the build itself.
One of the most cost effective ways to add real living space
A loft conversion turns unused roof space into a fully functional room — a bedroom, a home office, a bathroom, or all three. Because the structure is mostly already there, it’s consistently one of the most cost effective ways to add genuine square footage to a home, often adding up to 25% to the property’s value in the process.
Red Loft Extension manages every stage of the process in house: design, structural calculations, planning permission, party wall agreements, and the build itself — so you’re dealing with one team throughout, not five different contractors.
Five ways to convert a loft
The right type depends on your roof shape, your budget, and how much space you need.
Dormer
A box-shaped extension to the existing roof slope, adding full headroom and floor space. The most popular and versatile option.
Hip to Gable
Converts a sloped “hipped” roof side into a vertical gable wall, significantly increasing internal width. Ideal for semi-detached homes.
L-Shaped
Combines a dormer with a rear closet conversion to form an L shape, ideal for two new rooms or a bedroom with en-suite.
Velux / Rooflight
Windows fitted flush into the existing roof slope, with no structural changes to the shape. The fastest and most affordable option.
Mansard
A near-vertical rear slope at roughly 72 degrees, with an almost flat top. Maximises usable space, often used on period properties.
The same room, three months apart
This is one actual Red Loft Extension build, shown at three real stages — not a mockup. From first-fix insulation to a finished marble wet room.
Stage 1 — First Fix
16 March
Framing & First Fix
Insulation packed into the stud walls, with plumbing already routed for the new WC and shower.
Stage 2 — Waterproofing
18 March
Tanking & Waterproofing
A full waterproof membrane across floor and walls, sealing the wet room before a single tile goes on.
Stage 3 — Finished
12 April
The Finished Room
Full marble tiling, a backlit display niche, and a frameless glass shower screen — four weeks later.
From first call to finished room
Every project follows the same five stages, managed by one team throughout.
Consultation
A free, no obligation visit to discuss your goals and assess your roof space.
Design
Architectural drawings and structural calculations tailored to your home.
Planning
Permitted development checks, planning applications and party wall agreements handled for you.
Build
Structural work, first fix, insulation and waterproofing, all project managed on site.
Finish
Tiling, fittings and final snagging, with a full handover and 10 year guarantee.
How much does a loft conversion cost?
A rough guide — your exact figure depends on size, materials and the type of conversion.
The most cost effective option. No structural change to the roof shape, and rarely needs planning permission.
Our most popular conversion. Adds full headroom and usable floor space within the existing roof.
For larger structural changes and bigger spaces — typically two rooms, or a bedroom with en-suite.
Final cost depends on size, materials specified and any individual internal specifications. Every quote starts with a free, no obligation consultation.
Loft conversion FAQs
In most cases, planning permission is not required as long as the conversion falls under permitted development rights. If your extension exceeds certain volume limits, alters the roof shape significantly, or your property is in a conservation area, planning permission may be required. We assess this for every property during your free consultation.
Permitted development is a national planning allowance that lets certain types of work go ahead without a full planning application, provided specific limits and conditions are met. Most standard loft conversions fall under these rights.
Most loft conversions take between 8 and 12 weeks from start to finish, depending on the type of conversion and the scope of work involved.
A party wall agreement is a legal document required when building work affects a wall shared with a neighbouring property. We provide professional party wall surveyor services as part of our complete project management, handling notifications and agreements on your behalf.
Building control confirms that construction work meets safety and structural regulations. We work with our own trusted private building control partners to manage this process smoothly from start to finish.
Let’s talk about your loft
Free, no obligation consultation. We typically respond within 24 hours.