Do I need planning permission to change my roof tiles?

Not usually, as long as the new materials don't project beyond the existing roof plane. In conservation areas, you should match the existing materials.

Can I add rooflights without planning permission?

Generally yes, under Class C, as long as they don't project more than 150mm beyond the roof plane.

How much does a roof alteration cost?

Roof alteration costs in London typically range between £5,000 and £15,000, with rooflights at the cheaper end and a full re-roof with new materials at the higher end.

Do I need Building Regulations for a roof alteration?

Depending on the work, you may need Building Regulations approval for structural changes, insulation, or fire safety requirements.

Project guideGPDO Class C

Roof alteration in Sutton: Planning Permission Guide

What you need to know about roof alterations in Sutton — re-roofing, rooflights, and changing materials.

73%

approved in Sutton

£548

application fee

8 wks

typical decision

≤0.15m

rooflight proud

Based on 30 decided applications in Sutton over 36 months (22 granted, 8 refused).

Sutton has conservation areas including Carshalton Village, Beddington, Cheam Village, and Sutton High Street. Listed buildings cluster around Nonsuch Park, Carshalton House, and around Beddington church. Green Belt covers the southern fringes of the borough around Woodcote and Belmont. The borough is predominantly inter-war semi-detached and 1930s suburban housing, with relatively relaxed PD rights outside conservation and Green Belt boundaries.

Council planning portal Pre-application advice

Local data PD rules Costs Professionals Constraints FAQs

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Recent roof alteration decisions in Sutton

The 5 most recent decided applications. Addresses redacted to postcode area.

Granted

Change of use from Class F.2 (local community sports facilities) to Class E (day nursery) including the demolition of the existing buildi…

2026-07-20

Refused

Provision of ramped access to all external ground floor doors, hardstanding driveway area between the dwelling and garage and garage area…

SM52026-07-16

Granted

Application to vary conditions 3 (materials), 8 (dust management plan), 11 (secured by design), 12 (construction logistics plan), 14 (fir…

SM22026-05-22

Granted

Demolition of the existing single storey building and erection of four semi detached two storey dwellings with solar panels to front roof…

SM52026-05-22

Granted

Application to vary condition 1 (approved drawings) of planning permission Ref:DM2025/00470 to allow for alterations to the fenestration'…

SM62026-05-05

These are borough-wide. See the 5 nearest to your address.

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Permitted Development Rules

Class CPart 1

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

Must not project beyond existing roof planeMaterials must match existing

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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Typical Costs in London

Roof alteration costs vary depending on the scope — adding rooflights is much cheaper than a full roof replacement.

Roof alterationLondon

Cost per m²

£800–£2,000

construction rate

Typical total

£5,000–£15,000

Typically includes

MaterialsLabourScaffolding

Typically excludes

Planning application feeBuilding regs fee

Covers re-roofing, changing roof materials, adding rooflights. Full roof replacement is at the higher end.

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Which 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.

Architect / designerOptional

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)

Structural engineerNot needed

Party wall surveyorNot needed

Planning consultantNot 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.

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Conservation 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.

Conservation areas

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

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.

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Frequently Asked Questions

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Related guides

Loft conversion

GPDO Class B

Dormer

GPDO Class B

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