Two separate questions before you start
Planning controls deal with development and its effect on the building and surroundings. Building regulations address matters including structural safety, fire performance and energy efficiency. A project can be acceptable under planning rules while still needing building control involvement. Permission under one system should not be treated as approval under the other.
For a straightforward house re-roof, write down whether you are keeping the same appearance, changing the covering, altering the roof shape or adding openings. Also identify how much will be stripped and whether structural work is expected. Those details allow the relevant authority to answer the actual question rather than a vague enquiry about a new roof.
Do I need planning permission to replace my roof?
Like-for-like re-covering of a house which does not materially change its external appearance will usually fall within permitted development. That general position is not a guarantee for every address. Flats, removed permitted-development rights and more substantial alterations can require a different assessment. A visibly different material or an altered roof profile deserves an explicit check.
The Planning Portal roof planning guidance explains the starting point. Ask the local planning authority about your proposed scope if the answer is unclear. Photographs, a material description and any drawings are useful; do not rely solely on what a neighbouring owner was allowed to do.
Conservation areas and listed buildings
A conservation area does not mean every roof repair is prohibited. It does mean you should check the boundary, applicable controls and any Article 4 direction affecting the property. Traditional tile, slate, ridge and chimney details can contribute to local character, so a change that appears minor to an owner may still matter to the planning authority.
Listed building consent is a separate issue. Work affecting a listed building’s special architectural or historic character may require consent even when ordinary planning permission is not needed. Contact the council before changing materials or stripping details which may be significant. Historic England’s permissions advice explains why the building’s designation must be considered alongside the proposed work.
Does a new roof need building regulations?
A substantial replacement commonly brings building regulations into the discussion, even where planning permission is unnecessary. Structural alterations, a heavier covering or changes affecting fire performance can also matter. The extent of re-covering is relevant, but approval should not be reduced to a single rule of thumb without checking the complete scope.
The Planning Portal guidance on an existing roof describes the area thresholds and other circumstances that may require an application. If you are asking whether you need building regs for roof replacement, provide the affected area, covering specification and structural changes to building control. Agree the route before work starts and clarify which inspections and completion evidence will be required.
Part L: insulation when a thermal element is renovated
Part L concerns the conservation of fuel and power. Renovating a roof that forms a thermal element can trigger requirements to improve its thermal performance. The relevant tests concern the extent and nature of renovation, and the feasibility of upgrading; they are not the same as simply asking whether planning permission is needed.
An insulation upgrade must work with the roof design. Ventilation, condensation risk, available depth and the position of the insulation all need consideration. Consult the applicable Approved Document L and building control rather than assuming one thickness suits every construction. Traditional or protected buildings may need a particularly careful approach to avoid harming their fabric.
Competent person schemes and paperwork
Some authorised competent person schemes allow registered installers to self-certify work within the scheme’s scope. Check both the installer’s registration and whether the proposed roofing work is covered. This guide does not claim JBHomecare is registered with a scheme. Where required work is not being certified through an applicable scheme, agree the appropriate building-control route.
Retain the specification, relevant permissions and completion documentation with the house records. They can help future owners understand what changed. Compare the new roof cost factors and repair or replace guidance once the permitted scope is clear. Need it sorted? Book roof replacement and explain your plans in the quote form. Confirm any authority requirements before arranging the work.