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Build a hip-to-gable conversion.
Hip-end roof rebuilt to gable — opens up the loft for an extra bedroom on semis and end-terraces.
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Costs, timelines, pitfalls and the right questions to ask before any loft conversions starts on hip-to-Gable Loft Conversion.
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Hiring a loft conversions, without the regret.
Four moves that separate a smooth job from a nightmare.
Planning rejection
Visual impact on neighbours can lead to rejection. Pre-application advice essential.
Match brickwork
New gable wall must match existing. Tricky for old buildings. Salvage brick if needed.
Party wall agreements
If end-terrace, party wall surveyor often needed.
Asbestos in old roof
Removed roof tiles may have asbestos (pre-2000). Survey first.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Hip-to-gable conversion (smaller)End-terrace
£45k–£65k
Hip-to-gable + rear dormer comboMax loft space
£60k–£95k
Double hip-to-gable (detached)Both sides
£65k–£110k
New gable wall (brickwork)Cavity wall
£5k–£12k
New roof structure for gableTrusses, slates, gutters
£3.5k–£8k
Architect + structural design10% of build
£3.5k–£8k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Dormer loft conversion · week by week
Typical
6 phases · 10 wk
6 phases · 10 wk
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
Structural + design
Strip + steels in
Dormer build + roof
1st + 2nd fix
Plaster + finishes
Snags + handover
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
Infographic · VideoThe Loft Conversions briefing.
Infographic
Loft Conversions quick-view
Video guide
Loft Conversions explained
Hip-to-gable conversion straightens a sloped (hipped) corner of your roof into a vertical gable wall — creating significant additional loft space. Expect to pay £50,000–£80,000 for UK hip-to-gable conversion. Best suited to end-terrace and detached properties.
What Does the Work Involve?
Structural engineer designs new gable wall. Existing hipped roof removed at that corner. New gable wall built up to roof apex. New roof structure for gable area. Often combined with rear dormer for full loft conversion. Internal loft conversion proceeds as standard.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Hip-to-gable conversion (smaller) | 45,000 | 65,000 | End-terrace |
| Hip-to-gable + rear dormer combo | 60,000 | 95,000 | Max loft space |
| Double hip-to-gable (detached) | 65,000 | 110,000 | Both sides |
| New gable wall (brickwork) | 5,000 | 12,000 | Cavity wall |
| New roof structure for gable | 3,500 | 8,000 | Trusses, slates, gutters |
| Architect + structural design | 3,500 | 8,000 | 10% of build |
| Match existing brickwork | 0 | 0 | Usually no extra |
How Long Does It Take?
Hip-to-gable alone: 4-6 weeks. Combined with dormer/loft conversion: 12-18 weeks total.
DIY or Professional?
Professional only. Major structural change.
Choosing the Right Tradesperson
Specialist loft conversion company with hip-to-gable experience. Architect for design. Structural engineer for calcs.
UK Regulations
Building Regs Part A (structure) — major change. Planning permission usually required (visual change to roofline). Conservation areas restricted.
Common Problems
- Planning rejection: Visual impact on neighbours can lead to rejection. Pre-application advice essential.
- Match brickwork: New gable wall must match existing. Tricky for old buildings. Salvage brick if needed.
- Party wall agreements: If end-terrace, party wall surveyor often needed.
- Asbestos in old roof: Removed roof tiles may have asbestos (pre-2000). Survey first.
Frequently Asked Questions
Does my house suit hip-to-gable?
End-terrace with sloped end roof: yes. Detached with hipped roof: yes. Mid-terrace: no. Modern semi with hipped roof: yes.
How much extra space?
Hip-to-gable adds 25-40% more usable loft floor area vs leaving the hip. Significant.
Planning permission needed?
Usually yes — visual change to roofline. Conservation areas usually permission required. Listed buildings consent.
Match existing brick — possible?
For modern brick: yes from suppliers. For old/heritage brick: salvage from demolitions. Skilled bricklayer matches mortar.
Party wall surveyor needed?
For end-terrace adjacent to neighbour: yes, almost always. £400-£1,500 for surveyor.
Will it add value?
Yes — significantly. Combined hip-to-gable + dormer can add 25-30% property value.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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