Roof alteration in Bexley: Planning Permission Guide
What you need to know about roof alterations in Bexley — re-roofing, rooflights, and changing materials.
Based on 32 decided applications in Bexley over 36 months (26 granted, 6 refused).
Bexley has Green Belt in its south and east fringes, including Lesnes Abbey Woods, Footscray Meadows, and Joydens Wood. Conservation areas include Old Bexley Village, Lamorbey, and Blendon. Listed buildings are concentrated around Hall Place and Danson House. Flood zones affect properties along the Cray and Shuttle rivers. The borough is predominantly post-war suburban housing, so Class A and Class E rights tend to be more fully usable outside constrained zones.
Recent roof alteration decisions in Bexley
The 5 most recent decided applications. Addresses redacted to postcode area.
Replacement of existing windows/balcony doors with uPVC double-glazed windows/doors and external doors to be replaced with aluminium, pro…
Alterations to fenestration, addition of external wall insulation, roof coverings and installation of solar panels.
Replacement of existing windows/balcony doors with uPVC double-glazed windows/doors and external doors to be replaced with aluminium, pro…
Replacement of existing windows/balcony doors with uPVC double-glazed windows/doors and external doors to be replaced with aluminium, pro…
Erection of a detached two storey dwelling with associated car parking space, refuse and cycle storage including solar panels.
These are borough-wide. See the 5 nearest to your address.
Check your address freePermitted Development Rules
Any other alteration to the roof of a dwellinghouse
GPDO 2015, Schedule 2, Part 1, Class C
Roof alterations (other than dormers and loft conversions) are covered by Part 1, Class C of the GPDO. The key rule is that the alteration must not project beyond the existing roof plane.
Key dimension limits
These are the maximum GPDO limits for a detached house with no constraints. Your actual limits depend on your property type, location, and any planning restrictions.
Enter your postcode to see the personalised limits for your roof alteration.
Check my limitsTypical Costs in London
Roof alteration costs vary depending on the scope — adding rooflights is much cheaper than a full roof replacement.
Cost per m²
construction rate
Typical total
Typically includes
Typically excludes
Covers re-roofing, changing roof materials, adding rooflights. Full roof replacement is at the higher end.
Get a personalised cost estimate based on your actual roof alteration dimensions.
Get my estimateWhich Professionals Do You Need?
Most roof alterations don't need an architect, but a roofing contractor or draughtsperson can prepare any required drawings.
A draughtsperson or architectural technician can prepare any drawings needed. A full architect may not be necessary.
Roof alterations may need drawings for Building Regulations, but a draughtsperson or roofing contractor can often provide these.
Typical fee: £500–£2,000 (Basic drawings if needed)
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your roof alteration.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, roof alterations that change the appearance of the roof may be more tightly controlled. Materials should match the existing roof.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
Check my propertyFrequently Asked Questions
Just want a quick yes/no for your roof alteration?
Run our free 2-minute check to see whether your project likely qualifies as permitted development in Bexley — your address, your constraints, your council's own recent decisions.
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