Roof alteration in Canterbury: Planning Permission Guide
What you need to know about roof alterations in Canterbury — re-roofing, rooflights, and changing materials.
Based on 24 decided applications in Canterbury over 24 months (23 granted, 1 refused).
Canterbury includes or borders the Kent Downs AONB, the Canterbury Cathedral, St. Augustine's Abbey and St. Martin's Church World Heritage Site — properties in or near those areas are on Article 1(5) land where permitted-development rights are restricted. Canterbury has 98 conservation areas — extensive heritage coverage restricting external alterations across many streets. 463 Article 4 directions are in force — pre-application advice strongly recommended before any external work. 3,760 listed buildings recorded.
Personalised odds
5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent roof alteration decisions in Canterbury
The 5 most recent decided applications. Addresses redacted to postcode area.
Installation of 14 roof-mounted photovoltaic (solar) panels on the principal (front) roof slope.
Replacement of front windows from upvc to timber sliding sash windows, replacement of front door from upvc to timber, replacement of rear…
Detached single storey garage (including solar panels to roof) and storage building together with 1.8m high brick wall to southern bounda…
Installation of photovoltaic solar panels to a number of roofs at Old Palace.
Reconstruction of fire-damaged outbuilding with solar panels to the roof.
These are borough-wide. See the 5 nearest to your address.
Get my report — £9Permitted 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 South East England
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 Canterbury. For personalised approval odds and nearby comparables, get the £9 report.
Free 2-min check