Roof alteration in Merton: Planning Permission Guide
What you need to know about roof alterations in Merton — re-roofing, rooflights, and changing materials.
Check if your roof alteration qualifiesRoof alterations in Merton at a glance
approved *
application fee
weeks typical
Based on 10 decided applications in Merton over 12 months (8 granted, 2 refused). * Limited data — treat as indicative.
Merton has conservation areas including Wimbledon Village, Wimbledon Common, Mitcham Cricket Green, and Cannizaro Park. Listed buildings cluster around Wimbledon Common and Merton Abbey Mills. Wimbledon Common is Metropolitan Common Land with its own byelaws near the edges. Article 4 Directions cover parts of Wimbledon Village. The borough has a mix of affluent Edwardian housing around Wimbledon and Victorian terrace stock in Mitcham and Colliers Wood.
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Approval probability, 5 nearest comparables, refusal reasons — for your specific address.
Recent roof alteration decisions in Merton
The 5 most recent decided applications. Addresses redacted to postcode area.
APPLICATION FOR PRIOR APPROVAL IN RELATION TO THE INSTALLATION OF ROOF MOUNTED SOLAR PANELS.
APPLICATION FOR A LAWFUL DEVELOPMENT CERTIFICATE IN RESPECT OF THE PROPOSED INSTALLATION OF SOLAR PANELS ON THE SLOPING ROOFS OF THE HOUS…
ININSTALLATION OF SOLAR PANELS ON THE WEST WING AND FLAT ROOF
APPLICATION FOR THE INSTALLATION OF SOLAR PANELS.
APPLICATION FOR A LAWFUL DEVELOPMENT CERTIFICATE IN RESPECT OF THE PROPOSED INSTALLATION OF SOLAR PANELS AND HEAT PUMP SYSTEM.
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.
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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.
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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 Merton. For personalised approval odds and nearby comparables, get the full report above.
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