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GPDO 2015 England Permitted Development rules · statutory fees effective 1 April 2026

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Extensions & Lofts TCPA 1990 s.55(2)(a) & Schedule 2, Part 1 · Internal / Class A

Garage Conversion Planning Rules: Permission, Conditions & Building Regs

Converting an integral or attached garage into a room is usually not development needing permission – internal works are outside planning control, and swapping the garage door for a wall and window is normally covered by Class A. The catch is new-build estates, where conditions often require the garage to stay available for parking. Check your conversion below.

If PD
£0
Application
£548
Decision
8 wks

Step 1 · Your project

Garage Conversions checker

What external changes are planned?
What will the space be used as?
Does a planning condition require the garage to be kept for parking or remove PD rights?

Look up the original estate permission on your council’s planning portal – common wording is ‘the garage shall be retained for the parking of vehicles’.

Will at least one off-street space remain?
Is the house listed?
Do your deeds contain a covenant about the garage?

Rules reflect the GPDO 2015 (England) for houses. Flats, maisonettes, listed buildings and Article 4 areas have restricted rights. Disclaimer.

Step 2 · Live statutory assessment

No Planning Permission Needed – Building Regs Required

Internal / Class A

Your garage conversion does not need planning permission. You must still obtain Building Regulations approval before work starts.

  • No planning condition restricting the garage.
  • Use as an extra room for the house is not a change of use.
  • Replacing the door with a wall and window is a Class A alteration – use brick and window styles matching the house.
FRONT ELEVATION – GARAGE CONVERSION
DOOR → WALL + WINDOW DRIVEWAY SPACE RETAINED HOUSE

England fees & timings (from 1 April 2026)

Council application fee

£0

Internal works / Class A

Lawful Development Certificate

£274

Optional proof for buyers

Decision time

0 weeks

Building Control approval first

Applying online via the Planning Portal adds a £91 service charge (inc. VAT).

Builder & neighbour spec sheet

Export these exact limits and your answers to share with your contractor.

At a glance

Garage Conversions: the statutory limits in England

  • Purely internal works that do not materially affect external appearance are not development under section 55(2)(a) TCPA 1990.
  • Replacing the garage door with a wall and window is an alteration under Class A, provided materials are of similar appearance to the house.
  • Check the original planning permission: conditions requiring the garage to be retained for parking override PD and need a £89 variation application.
  • A conversion into a self-contained annexe with its own kitchen and bedroom may be a material change of use requiring a householder application.
  • Restrictive covenants in your title deeds are a separate private-law restriction enforced by the developer or estate company.
  • Full Building Regulations approval is always required to turn a garage into habitable space.

Statutory reference

Legislation summary & 2026 fee table

England statutory planning fees effective 1 April 2026. Wales, Scotland and Northern Ireland operate different regimes.

GPDO legislation and fee summary for Garage Conversions
Primary legislation Town and Country Planning (General Permitted Development) (England) Order 2015 (SI 2015/596), as amended
GPDO Schedule / Part TCPA 1990 s.55(2)(a) & Schedule 2, Part 1
Class Internal works (not development) & Class A external alterations
Exact reference TCPA 1990 s.55(2)(a); GPDO 2015 Sch.2 Pt.1 Class A, A.3(a) materials condition
Standard application fee £548 – Householder planning application
Lawful Development Certificate (proposed) £274 – optional proof the works are lawful
Planning Portal service charge £91 (inc. VAT) if submitted online
Council determination period 8 weeks
Key exclusions Conditions on the original estate permission frequently remove PD rights or require garages to be retained for parking.

Avoid enforcement

The 3 most common homeowner traps

Trap #1

The new-build estate condition

Houses built since the 1990s often have a condition on the original estate permission requiring the garage to be kept available for parking, or removing Class A rights. Search your address and the estate’s original application on the council planning portal – the decision notice lists every condition.

Trap #2

Covenants in the title deeds

Even with planning cleared, estate covenants can prohibit converting the garage without the developer’s consent. Developers often charge £100–£500 for a letter of consent. Download your title register from HM Land Registry for a few pounds and read the restrictive covenants.

Trap #3

Foundations under the old door opening

Garage doors usually sit over a shallow threshold, not a foundation. Building Control will require a proper footing under the new infill wall, and the floor raising to the house level with a damp-proof membrane – costs many people miss.

Separate legal regimes

Building Regulations vs planning permission

Turning a garage into habitable space is controlled building work – expect Building Control inspections at several stages:

Insulation (Part L)
Walls, floor and roof must reach current U-values – typically 0.18 W/m²K walls and floor, 0.15 roof, with new windows at 1.4.
Fire safety (Part B)
Mains-wired interlinked smoke alarms, and an escape window or protected route if the room is an inner room. The fire-resisting door to the house may change.
Ventilation (Part F)
Background ventilation (trickle vents) and purge ventilation via an openable window; extract fans for any WC or utility.
Damp & structure (Parts C and A)
A damp-proof membrane and insulated raised floor, a foundation under the infill wall, and lintels checked over the new window.

Where the garage is attached to a neighbour’s garage or house, building the infill wall and raising the floor can involve the Party Wall etc. Act 1996 – Section 2 for works to the party wall (two months’ notice) and Section 6 if excavating within 3m below the neighbour’s foundations (one month).

FAQs

Garage Conversions: frequently asked questions

Do I need planning permission to convert my garage?

Usually not for an integral or attached garage – internal works are not development, and replacing the door is a Class A alteration. You will need permission if a planning condition requires the garage to be retained, if the house is listed, or if you create a self-contained annexe.

How do I remove a condition stopping a garage conversion?

Submit a section 73 application to vary or remove the condition (£89 for householder development in England from April 2026), with a plan showing remaining parking. Councils approve many of these where adequate driveway parking remains.

Can I convert my garage into a bedroom?

Yes, as an extra room for the house it normally needs no planning permission. Building Regulations will require fire detection, an escape window, insulation and ventilation suitable for a bedroom.

Does converting a garage change my council tax?

An extra room in the existing house does not trigger rebanding on its own, though the Valuation Office Agency can reassess when the house is next sold. A self-contained annexe may be banded separately (with discounts or exemptions for some family members).

Sources: The Town and Country Planning (General Permitted Development) (England) Order 2015 and amendments (legislation.gov.uk); MHCLG ‘Permitted development rights for householders: technical guidance’; the Town and Country Planning (Fees for Applications…) (England) Regulations 2012 as amended; Building Regulations 2010 Approved Documents; Party Wall etc. Act 1996. Last reviewed 15 October 2026. See our editorial standards and disclaimer.

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