Permitted Development Rights Explained

01

What Are Permitted Development Rights?

What is the GPDO?
The Town and Country Planning (General Permitted Development) (England) Order 2015 (GPDO) is the statutory instrument that grants permitted development rights. It specifies exactly what types of development can be carried out without a planning application, the conditions and limitations that apply, and the circumstances where rights are restricted or removed.

Permitted development rights are a national grant of planning permission. Parliament has already decided that certain types of development are acceptable in principle, so you don't need to ask your local council for individual permission.

This doesn't mean there are no rules. PD rights come with strict conditions and limitations — exceed them by even a small margin, and you need a full planning application. The development must also comply with building regulations, which are entirely separate from planning permission.

Important distinction: Permitted development means you don't need planning permission. You may still need building regulations approval, party wall agreements, and compliance with other legislation.

02

Part 1: Householder Permitted Development

The rights most relevant to homeowners are found in Schedule 2, Part 1 of the GPDO. These cover extensions, alterations, and buildings within the grounds of a house. Part 1 is divided into Classes A to H, plus Class AA (adding storeys, with prior approval).

Class A — Rear and Side Extensions

This is the big one — and the one that catches most neighbours by surprise. You can build a single-storey rear extension:

• Up to 4 metres from the rear wall of the original house (detached houses)
• Up to 3 metres from the rear wall (semi-detached and terraced houses)
• No higher than 4 metres (A.1(f)(ii))
• No part higher than the highest part of the existing roof (A.1(c))
• Eaves no higher than the eaves of the existing house (A.1(d)), and no higher than 3 metres if any part of the extension is within 2 metres of a boundary (A.1(i))
• Extensions under the larger home extension scheme (prior approval needed) can go up to 8 metres (detached) or 6 metres (semi-detached/terraced), still single storey and still no higher than 4 metres (A.1(g))

For side extensions:

• Single storey only
• No wider than half the width of the original house
• No higher than 4 metres overall (A.1(j))
• Eaves no higher than 3 metres if any part is within 2 metres of the boundary (A.1(i)), and never higher than the existing eaves (A.1(d)). There is no "1 metre from the boundary" rule in Class A.
• Not allowed beyond a side wall that fronts a highway (A.1(e)(ii))

Two-storey rear extensions are also permitted under Class A, but with tighter rules:

• Maximum depth of 3 metres from the rear wall
• Must be at least 7 metres from the rear boundary
• Eaves no higher than the existing house's eaves (A.1(d)), and no higher than 3 metres if any part is within 2 metres of a boundary (A.1(i)), so in practice a two-storey extension sits more than 2 metres from the boundary
• Upper-floor windows in a side elevation are allowed, but must be obscure-glazed and non-opening unless the opening parts are more than 1.7m above the floor of the room (A.3(b))
• The roof pitch must, so far as practicable, match the original house (A.3(c))
• Not allowed at all on article 2(3) land, such as a conservation area (A.2(c))

Class B — Roof Additions (Dormers and Extensions)

You can enlarge the roof space of a house (loft conversions with dormers), subject to:

• Additional roof space must not exceed 40 cubic metres (terraced houses) or 50 cubic metres (detached and semi-detached)
• No extension beyond the plane of an existing roof slope that forms the principal elevation and fronts a highway (B.1(c)). "There will only be one principal elevation on a house" (householder technical guidance), so on a corner plot the side roof slope facing the second road is not caught by this rule.
• Not available at all on article 2(3) land, such as a conservation area (B.1(f))
• Materials must be similar in appearance to the existing house
• No verandas, balconies, or raised platforms
• Windows in a wall or roof slope forming a side elevation must be obscure-glazed, and non-opening unless the parts that open are more than 1.7m above the floor of the room (B.2(c))

Class C — Other Roof Alterations

Covers alterations to the roof that don't add volume — for example, installing roof lights. The alteration must not protrude more than 150mm beyond the plane of the roof slope.

For a class-by-class walkthrough of Class B and Class C as they apply to dormers, see do I need planning permission for a dormer.

Class D — Porches

A porch can be added without permission (see also: Do I Need Planning Permission for a Porch?) provided:

• The ground area doesn't exceed 3 square metres (external measurements)
• It's no more than 3 metres high
• No part is within 2 metres of a boundary fronting a highway

Class E — Outbuildings, Pools, and Enclosures

This class covers sheds, summer houses, garages, swimming pools, tennis courts, and similar. The rules:

• Must not be forward of the principal elevation (i.e., must be to the side or rear)
• Maximum height of 2.5 metres if within 2 metres of a boundary
• Maximum eaves height of 2.5 metres for any building
• Maximum overall height of 4 metres (dual-pitched roof) or 3 metres (any other roof)
• Total area of all outbuildings must not cover more than 50% of the garden (the land around the "original house")
• Not to be used as self-contained living accommodation

Decking is covered under Class E if it is no more than 0.3 metres above the ground. Anything higher is a "raised platform", which Class E excludes (E.1(h); "raised" is defined in Part 1, paragraph I). For specific guidance on common structures, see: Do I Need Planning Permission for a Shed?, Do I Need Planning Permission for a Garage?, Do I Need Planning Permission for a Carport?, or Do I Need Planning Permission for Decking?.

Class F — Hard Surfaces

Driveways, patios, and paths. Since 2008, if you're paving over more than 5 square metres at the front of your property, the surface must be made of permeable (porous) material or drain to a lawn or border — this was introduced to combat flooding.

Class G — Chimneys, Flues, and Soil/Vent Pipes

Installation of a chimney, flue, or soil/vent pipe, provided it does not exceed the highest part of the roof by 1 metre or more (G.1(b)). On article 2(3) land only, such as a conservation area, it also cannot go on a wall or roof slope that fronts a highway and forms the principal or a side elevation (G.1(c)).

Class H — Microwave Antennas (Satellite Dishes)

Up to two antennas on the house or within its curtilage. Only one may be longer than 0.6 metres, and none may be longer than 1 metre (H.1(b) and H.3). A dish on a chimney is allowed if it is no longer than 0.6 metres and does not stick up above the chimney (H.1(b)(iv)–(v)). The ban on a chimney, wall or roof slope that faces onto and is visible from a highway applies only on article 2(3) land (H.1(e)(i)).

03

Key Concepts to Understand

The "Original House"

Many PD calculations reference the "original house" — this means the house as it was first built, or as it stood on 1 July 1948, whichever is later. Previous extensions by former owners count against your PD allowance. If someone before you added a 3-metre rear extension, that's already used up part of your entitlement under Class A.

The 50% Rule

No more than half of the land around the original house should be covered by buildings, enclosures, pools, or containers. This includes the area covered by existing extensions and outbuildings.

Height Constraints Near Boundaries

The 2 metre boundary rule works differently for each class:

• Outbuildings (Class E): no higher than 2.5 metres within 2 metres of a boundary (E.1(e)(ii)).
• Extensions (Class A): eaves no higher than 3 metres within 2 metres of a boundary (A.1(i)), with the 4 metre overall height limit for single-storey extensions.

04

Article 4 Directions

Local councils have the power to issue Article 4 directions that remove permitted development rights in specific areas. These are most commonly applied in:

• Conservation areas — to protect architectural character
• Areas of Outstanding Natural Beauty (AONB) — now called National Landscapes
• Areas with particular housing pressures — to prevent office-to-residential conversions

If an Article 4 direction applies to your property, you'll need planning permission for work that would otherwise be permitted development. Your council's planning department can confirm whether any directions apply, and this information is often included in property searches.

05

Conservation Areas and Listed Buildings

If you live in a conservation area, your PD rights are automatically more restricted under the GPDO:

• No cladding of the exterior in stone, artificial stone, pebble dash, render, timber, plastic or tiles (A.2(a))
• No side extensions (A.2(b))
• No rear extensions of more than one storey (A.2(c))
• No larger home extensions (the 6m/8m prior approval route does not apply on article 2(3) land, A.1(g))
• No roof extensions at all: Class B (dormers and other roof additions) does not apply on article 2(3) land, on any roof slope (B.1(f)). Rooflights under Class C are still allowed.

If your home is a listed building, permitted development rights do not apply in the same way. Almost any alteration — internal or external — that affects the character of the building will require listed building consent under Section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990, regardless of whether it would otherwise be permitted development. For a comprehensive guide to what you can and cannot do to a listed property, see Planning Permission for Listed Buildings.

Cladding the exterior of a property in a conservation area also requires planning permission — see Do I Need Planning Permission for Cladding? for more detail.

06

Prior Approval vs Full Planning Permission

Some permitted development rights require prior approval from the council before work can begin. This is a lighter process than a full planning application but still involves notifying neighbours and assessing specific impacts.

The most common prior approval requirements for householders relate to the larger home extension scheme (single-storey rear extensions beyond the standard limits). The council will notify adjoining owners, and if objections are raised, the council decides whether the impact on amenity is acceptable.

Prior approval is also required for many change of use rights under Part 3 of the GPDO — for example, converting offices to homes (Class MA) or shops to homes.

Key difference: With prior approval, the principle of development is already accepted. The council can only assess the matters the GPDO lists for that right. For a larger home extension, the only matter is the impact on the amenity of adjoining premises, and it arises only if an adjoining owner or occupier objects (A.4(7)). Change-of-use rights list other matters: for Class MA (commercial to homes) they include transport, contamination, flooding, noise and natural light (MA.2(2)). The council can't refuse on general design or character grounds unless the order lists them.

07

Common Misconceptions

"My neighbour needs my permission to build near the boundary."
No. There's no requirement for your neighbour to get your consent. PD rights are legal entitlements. You may have rights under the Party Wall etc. Act 1996 if they're building on or near the boundary, but that's separate from planning.

"If they didn't get planning permission, it must be illegal."
Not necessarily. A great deal of householder building work in England is done under permitted development rights, with no application to the council. It's only "illegal" if it exceeds the PD limits and no planning permission has been granted.

"The council would have told me."
Most permitted development needs no application, so neighbours are not told. The exceptions are rights that need the council's prior approval: for a larger single-storey rear extension or an extra storey (Class AA), the council must notify adjoining owners and occupiers and allow at least 21 days for comments (A.4(5); AA.3(5)). If your neighbour obtains a Lawful Development Certificate (a formal confirmation that the work is PD), that's a public record, but there's no duty to notify you.

"You can't build right up to the boundary."
You can, subject to the height restrictions. A single-storey extension with eaves no higher than 3 metres and no higher than the existing eaves (and no more than 4 metres high overall) can be built right up to the boundary line under permitted development (A.1(d), (f) and (i)). Outbuildings within 2 metres of a boundary are limited to 2.5 metres.

"Permitted development means no rules apply."
PD has very specific and measurable limits. Exceed them by 100mm and you've committed a breach of planning control. Building regulations still apply in full. The Party Wall Act may apply. Other consents (listed building, tree preservation orders) are separate.

08

How to Check If PD Rights Apply

1. Check with your council's planning department. Most offer a duty planner service where you can ask informally.
2. Apply for a Lawful Development Certificate (LDC). This costs half the planning fee: £274 for a house extension or £136 for an outbuilding, from 1 April 2026 (MHCLG fee schedule; fees rise each April). It gives you — or your neighbour — a formal legal confirmation that the proposed work is permitted development. Under Section 192 of the Town and Country Planning Act 1990, councils must issue a certificate if the development is lawful. If your council refuses to issue an LDC, you have the right to appeal to the Planning Inspectorate.
3. Use the Planning Portal's interactive guides. The government's Planning Portal has step-by-step tools to check common types of householder development.

Planning rules vary by council — check your local council's planning portal or search for your area, such as Manchester, Birmingham, or Leeds, to confirm whether any Article 4 directions apply to your property.

If you're concerned about a neighbour's building work, services like PlanWatch can help you stay informed about planning activity in your area, including applications, prior approvals, and lawful development certificates.

10

Summary

Permitted development rights give homeowners significant freedom to extend, alter, and improve their properties without planning permission — but within clearly defined limits. Understanding these limits is essential whether you're planning your own project or concerned about what your neighbour is building.

The key takeaway: just because no planning application was submitted doesn't mean the work is unlawful. But equally, just because someone calls it "permitted development" doesn't mean it actually complies. The measurements, conditions, and restrictions in the GPDO are precise and enforceable. When in doubt, check with your council or apply for a Lawful Development Certificate.

This guide was researched and written by the PlanWatch team. PlanWatch monitors planning applications across 300+ UK councils.