Hampstead Architecture and Planning

Tool

Do I need planning permission?

Answer three questions for a cautious, plain-English sense of what planning permission or consents your project is likely to involve. This is guidance, not a determination.

Prefer to browse? Here is the cautious general position for each common project, across the property situations we see most often. It is guidance only — the conservation status, listing and planning history of the specific property must always be confirmed.

Rear or side extension

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Relevant services:Conservation Area Architects, Planning Applications, Building Regulations Drawings

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Relevant services:Planning Applications, Building Regulations Drawings

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Relevant services:Flat Refurbishment Architects, Planning Applications, Building Regulations Drawings

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Relevant services:Listed Building Consent, Listed Building Architects, Building Regulations Drawings

Loft conversion

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Loft conversions can sometimes proceed under permitted development for houses, but conservation areas, flats and designs affecting the principal elevation often require planning permission, and a protected stair and fire measures are usually needed.

Relevant services:Conservation Area Architects, Planning Applications, Loft Conversion Architects, Building Regulations Drawings

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Loft conversions can sometimes proceed under permitted development for houses, but conservation areas, flats and designs affecting the principal elevation often require planning permission, and a protected stair and fire measures are usually needed.

Relevant services:Planning Applications, Loft Conversion Architects, Building Regulations Drawings

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Loft conversions can sometimes proceed under permitted development for houses, but conservation areas, flats and designs affecting the principal elevation often require planning permission, and a protected stair and fire measures are usually needed.

Relevant services:Flat Refurbishment Architects, Planning Applications, Loft Conversion Architects, Building Regulations Drawings

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Loft conversions can sometimes proceed under permitted development for houses, but conservation areas, flats and designs affecting the principal elevation often require planning permission, and a protected stair and fire measures are usually needed.

Relevant services:Listed Building Consent, Listed Building Architects, Loft Conversion Architects, Building Regulations Drawings

Basement

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Basements are subject to specific borough policies, significant structural and waterproofing design, and party wall procedures. Feasibility against the relevant policy is the essential first step.

Relevant services:Conservation Area Architects, Planning Applications, Basement Architects, Building Regulations Drawings

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Basements are subject to specific borough policies, significant structural and waterproofing design, and party wall procedures. Feasibility against the relevant policy is the essential first step.

Relevant services:Planning Applications, Basement Architects, Building Regulations Drawings

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Basements are subject to specific borough policies, significant structural and waterproofing design, and party wall procedures. Feasibility against the relevant policy is the essential first step.

Relevant services:Flat Refurbishment Architects, Planning Applications, Basement Architects, Building Regulations Drawings

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Basements are subject to specific borough policies, significant structural and waterproofing design, and party wall procedures. Feasibility against the relevant policy is the essential first step.

Relevant services:Listed Building Consent, Listed Building Architects, Basement Architects, Building Regulations Drawings

Internal alterations

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Internal alterations to an unlisted house often do not require planning permission, but building regulations approval is usually needed for structural and many other works.

Relevant services:Conservation Area Architects, Planning Applications, Building Regulations Drawings

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Internal alterations to an unlisted house often do not require planning permission, but building regulations approval is usually needed for structural and many other works.

Relevant services:Planning Applications, Building Regulations Drawings

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Relevant services:Flat Refurbishment Architects, Building Regulations Drawings

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Relevant services:Listed Building Consent, Listed Building Architects, Building Regulations Drawings

Outbuilding or garden room

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Relevant services:Conservation Area Architects, Planning Applications, Building Regulations Drawings

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Relevant services:Planning Applications, Building Regulations Drawings

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Relevant services:Flat Refurbishment Architects, Planning Applications, Building Regulations Drawings

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Relevant services:Listed Building Consent, Listed Building Architects, Building Regulations Drawings

Change of use

House in a conservation area (or under an Article 4 direction)

In conservation areas, permitted development rights are often reduced, and an Article 4 direction may remove them. Planning permission may well be required, and design is assessed more closely. The conservation status and any Article 4 direction should be checked for the property.

Changing the lawful use of a property usually requires planning permission and raises access, fire and amenity considerations. The position depends on the existing and proposed use classes.

Relevant services:Conservation Area Architects, Planning Applications

House with no special designations

Some works to a house may be possible under permitted development, subject to limits and conditions on size, height, materials and position. This cannot be assumed and depends on the specific property; a lawful development certificate can confirm that works are lawful.

Changing the lawful use of a property usually requires planning permission and raises access, fire and amenity considerations. The position depends on the existing and proposed use classes.

Relevant services:Planning Applications

Flat or maisonette

Permitted development rights generally do not apply to flats and maisonettes, so this work will often require planning permission. You will also usually need the freeholder’s consent through a Licence to Alter.

Changing the lawful use of a property usually requires planning permission and raises access, fire and amenity considerations. The position depends on the existing and proposed use classes.

Relevant services:Flat Refurbishment Architects, Planning Applications

Listed building

Listed building consent is likely to be required for many internal and external alterations, in addition to any planning permission. Unauthorised works to a listed building are a criminal offence, so the position must be confirmed before any work.

Changing the lawful use of a property usually requires planning permission and raises access, fire and amenity considerations. The position depends on the existing and proposed use classes.

Relevant services:Listed Building Consent, Listed Building Architects, Planning Applications

Get a property-specific view

Send us the address and a short description of the work. We will confirm the relevant designations and advise on the likely planning route.

Call 020 8054 8756Send Details