Permitted Development Rights Explained: A Guide for Builders and Homeowners in England
Permitted development (PD from now on) rights let you carry out certain types of building work and changes of use without submitting a full planning application to your local planning authority (LPA). They exist so that routine, low-impact projects - a rear extension, a loft conversion, a garden outbuilding - don't need to go through the full planning process every time.
This guide explains how PD rights work in England, the main limits homeowners and builders need to know, and where the rights don't apply. It's written for general guidance only; PD rules are detailed and site-specific, so always check the current legislation and confirm your project with your Local Planning Authority (LPA) before starting work.
The legal basis
PD rights in England are granted nationally by the Town and Country Planning (General Permitted Development) (England) Order 2015 (the GPDO), and amended many times since. The GPDO is organised into Schedules, Parts, and Classes - for example, householder extensions sit under Schedule 2, Part 1, Class A. Government-published technical guidance explains how the rules apply in practice, but the Order itself is the legal authority.
Because PD rights are a creature of statute, they can be - and periodically are - amended, extended, or restricted by government. Always check you're working from the current version.
Key terms you need to know
Original house/dwellinghouse: the house as it was first built, or as it stood on 1 July 1948 if built before that date. Even if you didn't build a previous extension, a past owner's work still counts toward your limits.
Curtilage: the enclosed land around the house - garden, driveway, and similar. Not a fixed legal boundary; can be a matter of judgement by the LPA.
Article 2(3) land: broadly, conservation areas, National Parks, the Broads, Areas of Outstanding Natural Beauty, and World Heritage Sites. PD rights are more restrictive here.
Prior approval: a lighter-touch process where the LPA checks specific matters (not a full planning application) before work can start.
Article 4 direction: a local order that removes some or all PD rights in a specific area, usually to protect the character of a conservation area or similar location.
Who has permitted development rights
PD rights for extensions and alterations generally apply to houses - not flats, maisonettes, or most other building types. If you live in a flat, or a house that's been converted into flats, you'll typically need planning permission for external works.
New houses built or converted using PD rights (for example, under the office-to-residential or commercial-to-residential routes) usually cannot then use further householder PD rights for extensions - full planning permission is normally required for later changes.
Extensions
Standard single-storey rear extensions
Without needing prior approval, a single-storey rear extension must not extend beyond the rear wall of the original house by more than:
4 metres for a detached house
3 metres for any other house (semi-detached or terraced)
Maximum height limits also apply: broadly, no higher than 4 metres, and (where within 2 metres of a boundary) eaves height restricted to 3 metres.
The Larger Home Extension Scheme (prior approval route)
Homeowners can build bigger single-storey rear extensions using the prior approval/neighbour consultation scheme:
Up to 8 metres beyond the rear wall for a detached house
Up to 6 metres for any other house
This route requires you to notify the LPA, which consults neighbours; if no objection is raised (or objections are resolved), the work can proceed without a full application. All the other normal conditions - height, materials, curtilage coverage - still apply. Note – this scheme is not available on Article 2(30 land.
Two-storey and side extensions
Two-storey rear extensions have tighter limits: generally, no more than 3 metres beyond the rear wall, must be no closer than 7 metres to the rear boundary, and must not exceed the height of the existing roof. Side extensions must generally be single storey, no more than 4 metres high, and no wider than half the width of the original house.
General extension conditions that always apply
No extension may cover more than half the area of land around the original house (once all outbuildings and extensions are counted)
Materials should be of similar appearance to the existing house
No verandas, balconies, or raised platforms
Roof pitch of extensions over one storey must match the existing house as closely as practicable – and some LPAs do emphasise this condition
Side-facing windows on upper floors must generally be obscure-glazed and non-opening below 1.7m.
Different (usually stricter) rules apply on designated land (Article 2(3) land) - extensions beyond the rear wall on such land are typically capped at 4 metres for detached and 3 metres for other houses, with the larger scheme not always available.
Loft conversions
Loft conversions (rear dormers, roof alterations) can be permitted development subject to conditions including:
A volume allowance of up to 40 cubic metres additional roof space for terraced houses, and 50 cubic metres for detached and semi-detached houses
No extension beyond the plane of the existing roof slope on the principal (front) elevation facing a highway
Materials to match the existing house
No verandas, balconies, or raised platforms
Side-facing windows obscure-glazed as above
Roof extensions must be set back as far as practicable (usually at least 20cm) from the eaves.
Outbuildings, sheds, and garden structures
Outbuildings (sheds, garden offices, home gyms) can be PD subject to:
Single storey, with a maximum eaves height of 2.5 metres
Maximum overall height of 4 metres with a dual-pitched roof, or 3 metres for any other roof
If within 2 metres of a boundary, maximum overall height of 2.5 metres
Not forward of the principal elevation of the house
Combined with other extensions/outbuildings, must not exceed 50% of the curtilage
Not to be used as separate self-contained accommodation.
Porches
A porch is PD provided:
The ground floor area (measured externally) does not exceed 3 square metres.
No part is more than 3 metres above ground level.
No part is within 2 metres of any boundary with a highway.
Other common householder PD rights
Fences, gates, and walls: up to 1 metre high next to a highway, or 2 metres elsewhere, without permission
Hardstanding/driveways: permitted, though porous or permeable surfacing (or drainage to a soakaway) is required if the area exceeds 5 square metres to avoid surface water runoff issues
Solar panels and microgeneration: generally permitted on most roofs subject to projection and, for listed buildings/conservation areas, additional restrictions
EV charging points: generally permitted development for most houses, subject to conditions on height and siting
External painting: normally permitted, except where it would amount to advertising, or the property is listed.
Change of use rights (relevant to builders and developers)
Separate PD rights exist under different Parts and Classes of the GPDO for changing a building's use without full planning permission - for example, certain commercial-to-residential conversions (including under Class MA, covering various commercial uses converting to residential). These routes typically still require prior approval covering matters such as flooding, contamination, noise, and adequate natural light, and are subject to size and other limits that change periodically. Because this area of PD law has been amended frequently in recent years, builders and developers should check the current version of the relevant Class before relying on it, and should not assume a use-class conversion automatically qualifies.
Where permitted development rights don't apply, or are restricted
Flats and maisonettes: no PD rights for extensions in most cases
Listed buildings: PD rights are significantly restricted, and listed building consent is a separate legal requirement for almost any alteration, inside or out
Conservation areas, National Parks, Areas of Outstanding Natural Beauty, the Broads, World Heritage Sites (Article 2(3)/"designated" land): several PD rights are reduced or removed, particularly for side extensions, cladding, and larger outbuildings
Article 4 directions: a council can remove specific PD rights in a defined area. You must check with the LPA whether one applies to your property.
New build homes with planning conditions: some new-build developments have planning conditions that specifically remove standard PD rights - always check the original planning permission and its conditions.
Permitted development and building regulations are separate
PD rights only relate to planning permission. Almost all PD projects - extensions, loft conversions, outbuildings over a certain size - will still need to comply with Building Regulations separately, covering structural safety, fire safety, insulation, ventilation, and drainage. You may also need to comply with the Party Wall etc. Act 1996 if working on or near a shared wall or boundary with a semi-detached or terraced neighbour.
Protecting yourself: Lawful Development Certificates
Even where you're confident a project falls within PD rights, it's not automatically "on the record." If you plan to sell the property later, a buyer's solicitor will often ask for proof the work was lawful. You can apply to your LPA for a Lawful Development Certificate (LDC), which formally confirms the work was (or would be) permitted development. This carries a fee but provides a legal record that can prevent problems at sale, and protects against enforcement action later.
Practical steps before starting work
Confirm the property is a house (not a flat/maisonette) and check for any Article 4 direction or planning conditions restricting PD rights.
Establish the "original house" footprint and what has already been built under PD (extensions by previous owners count).
Measure your proposed work against the specific Class and conditions that apply - extensions, loft conversions, and outbuildings each sit under different rules.
Check whether prior approval is required (e.g., larger home extensions, some change-of-use projects) and factor in the neighbour consultation period.
Confirm Building Regulations approval separately - PD does not exempt you from this.
Consider applying for a Lawful Development Certificate once work is complete, or before starting if you want certainty in advance.
When in doubt, get written confirmation from the LPA or advice from a qualified planning consultant or architect - informal assumptions about PD rights are a common source of costly enforcement problems.
Turning your plans into reality
Once you've established what falls within permitted development, the next step is getting the project properly drawn up and costed, whether it’s for a client or your own self-build.
PlansXpress produces architect-quality, Building Regulation-suitable CAD drawings, giving you professional plans without the costly price tag. Construction knowledge rather than CAD drawing experience is recommended. Ask for a short demo.
If you already have plans and simply need them priced accurately, the highly experienced team at HBXL Estimating Service produce detailed, reliable cost breakdowns and management reports for builders across the UK. For a more self-build friendly version, ask for a no-obligation fee from the Build It Estimating Service, of Build It Magazine and Build It Live fame.
Want to create the estimate yourself? EstimatorXpress puts the same estimating power in your hands, helping you generate accurate build costs for extensions, conversions - and new builds.
This article summarises general permitted development rules in England as they commonly apply, based on the Town and Country Planning (General Permitted Development) (England) Order 2015 and associated technical guidance. It is not a substitute for professional planning advice. PD rules are detailed, are amended periodically, and depend on the specific circumstances of a property — always verify current requirements with your local planning authority or a qualified professional before relying on permitted development rights.