Dormer, hip-to-gable, L-shaped and Velux-only conversions across Cheshire and Greater Manchester. Planning, party wall notices, structural steelwork, en-suite and staircase — all delivered in-house.
In the right roof, a loft conversion gives you another bedroom — often with en-suite — for a fraction of what a rear extension costs, and without touching a blade of grass. Most rear dormers fall under Permitted Development, which cuts months off the timeline.
We\'ve converted everything from 1930s hip-roof semis in Wilmslow to 1970s truss-built detached houses in Warrington. The constraint is always headroom and existing structure — and we\'ll tell you at the site visit whether yours is worth doing.
From the party wall notice to the final piece of architrave. One team handles planning, structure, dormers, staircase and fit-out — so there's one accountable contract for the whole project.
Ridge-height measurements, truss assessment and sketch options — before you commit to a design fee.
Full PD notifications or planning applications, plus party wall notices to adjoining owners.
Purlin-replacing steels, floor-spanning beams and ridge members — designed by our consultant engineer.
Flat-roof or pitched dormers in matching brick, tile-hung, timber-clad or rendered finishes.
Conservation-grade and standard Velux rooflights, plus larger in-plane glazed panels.
Warm-roof construction to latest Part L — no cold attic spaces, no condensation issues.
Bespoke timber staircases optimised for headroom and floor-plan impact — often a doubled-up scissor stair.
Full bathrooms with boosted hot water where needed, rewiring extended, mains-interlinked smoke alarms.
An L-shaped rear dormer on a 1930s semi giving two new bedrooms and a three-piece en-suite. Zinc-clad dormer cheeks, bespoke oak stair and a large fixed-pane Velux framing the garden view. 12 weeks on site, delivered without the family having to move out.
View full projectA single accountable team, start to finish. No handoffs, no subcontractor blame-games, no surprises.
We visit your property and discuss your vision, requirements, and budget.
Our team prepares designs and handles planning and building regulations.
You receive a detailed, transparent quote with no hidden costs.
Our trusted team delivers your project to the highest standard, on time and on budget.
Final inspection, snagging, and handover. Your project, fully certified.
The questions we answer most often at the first roof inspection.
Rear dormers and hip-to-gable conversions often fall under Permitted Development if the new volume is below the allowance (40m³ for terraced, 50m³ for semi/detached). Anything on the front elevation or in a conservation area needs a formal application. We check eligibility at the free site visit.
A Velux-only conversion starts around £32,000. Rear dormers typically run £45,000–£70,000 depending on size and en-suite. Hip-to-gable and L-shaped dormers push £60,000–£90,000+. Every quote is itemised so you see exactly what the price includes.
Typical programme is 9–14 weeks on site, depending on complexity. Scaffolding usually up for 6–8 weeks, internal fit-out the balance. We keep the existing house sealed during structural work so you can keep living in it.
Minimum usable height is 2.2m at the ridge. Truss roofs (common in 1960s–80s builds) need more structural work than cut roofs on older houses. We survey the existing structure on the first site visit and tell you straight if it's worth converting — or if a rear extension would give you more usable space for similar money.
Yes. Building Regs require a 30-minute fire-resistant staircase enclosure from ground floor to loft, plus FD30 doors to habitable rooms. Mains-interlinked smoke alarms across all floors too. All handled as part of our build package.
Yes — the existing ceiling stays in place until we're ready to cut the opening for the new stairs, which is usually in week 6 or 7. Noise and dust during structural weeks are real, but the house stays habitable.
CDB have knowledge and experience they use wisely to achieve great outcomes. They are competent, experienced, knowledgeable, friendly, trustworthy, communicative, considerate, and hardworking.
Book a free site visit. We'll measure the ridge, survey the existing structure, and tell you honestly whether it's worth converting before any money changes hands.