Permitted development (PD) rights allow homeowners in England to carry out certain building works without applying for full planning permission. They are granted by parliament through the Town and Country Planning (General Permitted Development) (England) Order 2015, as amended, and cover a defined range of extensions, outbuildings, and alterations — provided the project stays within specified size, height, and siting limits.
The rights exist because parliament has already decided, in principle, that works of a certain scale are unlikely to harm neighbours or the character of an area. Understanding exactly what falls within PD — and what can strip those rights away — is essential before breaking ground.
What Permitted Development Covers
PD rights apply to a wide range of domestic works on a dwelling house. The key categories are:
- Rear extensions — single and two-storey additions to the back of the house
- Side extensions — single-storey only, within 50% of the original house width
- Loft conversions — with or without dormer windows, within volume limits
- Outbuildings — garages, garden rooms, sheds, swimming pool enclosures
- Porches — at ground level, under 3m², under 3m high
- Roof alterations — including rooflights, provided they do not project above the existing roof slope
- Internal works — structural changes inside the dwelling do not require planning permission at all
- Driveways — hard standings using permeable surfacing (or draining to a soakaway) are permitted; impermeable surfaces over 5m² to the front do require consent
What PD Does NOT Cover
Permitted development rights apply only to dwelling houses. The following are excluded entirely:
- Flats and maisonettes — permitted development does not apply; any external alteration requires a householder planning application
- Listed buildings — PD rights are removed; listed building consent is required for virtually any work
- Conservation areas — certain rights are restricted; side extensions, cladding changes, and some roof alterations lose PD status
- Areas of Outstanding Natural Beauty (AONB) and National Parks — reduced PD rights apply; rear extensions under the larger-home extension scheme are not available, and restrictions on outbuildings are tighter
- New-build homes — developers sometimes remove PD rights as a planning condition; check your title deeds and original planning consent
Size and Height Limits
The limits below apply to houses in England that have not previously been extended and are not in a restricted area. Where a house has already been extended, the new works must be assessed against the original house footprint, not its current state.
Extension Limits Summary
| Extension type | Standard PD limit | Larger home extension (neighbour consultation) |
|---|---|---|
| Single-storey rear — detached | 4m depth | 8m depth |
| Single-storey rear — other houses | 3m depth | 6m depth |
| Two-storey rear | 3m depth | Not available |
| Side extension (all house types) | 50% of original width, single storey, max 4m high | Not available |
| Height — single storey extension | Max 4m (or eaves/ridge height of original roof, whichever is lower) | Same |
| Height — two-storey extension | Max 3m from boundary | Same |
Loft Conversions
Loft conversions are permitted provided the additional volume does not exceed:
- 40m³ for terraced houses
- 50m³ for detached and semi-detached houses
These figures are cumulative: if a loft conversion was carried out previously, any new works eat into the same allowance. Dormers must not exceed the height of the existing roof ridge and must be set back at least 20cm from the eaves. No part of the conversion may extend beyond the existing roof slope on a principal or side elevation facing a highway.
Outbuildings
Outbuildings — including garden offices, garages, and sheds — are permitted provided:
- They occupy no more than 50% of the total curtilage (garden area, excluding the original house footprint)
- They are single storey (dual-pitched roof maximum 4m; flat or mono-pitched roof maximum 3m)
- If the building is within 2m of a property boundary, the maximum height drops to 2.5m
- They are not forward of the principal elevation of the house
- They are not used as a separate dwelling
In National Parks, AONBs, and the Broads, outbuildings over 10m² that are more than 20m from the house require a planning application.
Prior Approval and Neighbour Consultation
Standard Prior Approval
For some categories of PD, the local planning authority (LPA) must decide whether prior approval is needed before works begin. This applies to larger home extensions, certain changes of use, and telecommunications equipment, among others. Prior approval is not the same as planning permission — the LPA is only assessing specific, prescribed matters (typically impact on amenity, highways, flood risk) rather than the full range of planning considerations.
The Neighbour Consultation Scheme (Larger Home Extensions)
Single-storey rear extensions that exceed the standard 4m/3m limits but stay within 8m (detached) or 6m (other) are permitted under what is commonly called the Neighbour Consultation Scheme. The process works as follows:
- The applicant notifies the LPA before starting work, using a prior approval application form and paying the fee (currently £206 in England as of 2026)
- The LPA serves notice on adjoining owners and occupiers
- Those neighbours have 42 days from the date of receipt of notice to raise objections
- If no objections are received within the 42-day window, or if any objections are made but the LPA decides the impact on amenity is acceptable, prior approval is granted and works can proceed
- If the LPA refuses prior approval, the extension cannot be built under PD and a full planning application would be needed
The 42-day period is firm. If the LPA does not issue a decision within that window, prior approval is deemed granted by default — but applicants should obtain written confirmation before starting.
Two-Storey Extensions
Two-storey rear extensions under PD are limited to 3m depth and must not be within 7m of the rear boundary. No neighbour consultation scheme exists for two-storey works — they must stay within the standard limits or a full application is required.
What Removes Your PD Rights
Several circumstances can strip permitted development rights, sometimes permanently and sometimes for specific categories of work.
Article 4 Directions
An Article 4 direction is a formal instrument issued by an LPA that removes specified PD rights in a defined area. They are most commonly used in:
- Conservation areas — to control extensions, cladding changes, and satellite dish installation
- Areas of high housing pressure — to prevent conversion of family homes to houses in multiple occupation (HMOs) without planning permission
- Designated estates — where the character of a planned development is considered worth protecting
Where an Article 4 direction is in force, the works it covers require a full planning application. LPAs must give 12 months’ notice before bringing most Article 4 directions into effect (with exceptions for urgent cases), and they cannot charge a fee for applications that are only needed because of the direction — though this exemption typically applies only for the first year.
Planning Conditions on the Original Permission
If your property was built under a planning permission that included a condition removing or restricting PD rights, those rights simply do not exist. This is common on new-build estates and infill developments where the LPA was concerned about cumulative density. Check the original planning consent (available via the LPA’s planning portal) and your title deeds.
Previous Extensions and Cumulative Volume
PD is not unlimited — it applies to the original house as built (or as it stood on 1 July 1948 if built before that date). Any extension added since then counts against your allowance, whether or not it was built under PD or with planning permission. A house that has already been extended 3m to the rear under PD has no further standard PD allowance for rear extensions, though it may still use the neighbour consultation scheme up to the 8m/6m limit.
Listed Building Status
Listing a building at any grade (I, II*, or II) does not automatically remove PD rights in law, but the requirement for listed building consent for works that affect the character of a listed building effectively overrides PD for the vast majority of structural and external alterations. In practice, listed building owners should assume nothing is permitted without checking with the LPA’s conservation officer.
Lawful Development Certificates
A lawful development certificate (LDC) is a formal document issued by the LPA confirming that a specific use, operation, or activity is lawful. For PD works, there are two types:
- Certificate of Lawful Proposed Use or Development (CLPUD) — confirms that proposed works would be lawful if carried out as described; useful before committing to a contractor
- Certificate of Lawful Existing Use or Development (CLEUD) — confirms that works already carried out were lawful at the time; relevant when selling or refinancing
Why Bother Getting One?
An LDC is not a legal requirement to carry out PD works. However, without one, you are relying on your own assessment that the works fall within PD — which may later be disputed. The circumstances where an LDC matters most are:
- On sale of the property — solicitors acting for buyers routinely raise enquiries about extensions and alterations; an LDC provides clean evidence of lawfulness and prevents the matter becoming a negotiating point
- On remortgage — lenders’ surveyors may flag extensions that lack documentary evidence of consent
- When neighbours dispute the works — an LDC issued by the LPA carries evidential weight if enforcement action is threatened
- When your assessment is marginal — if the works are close to the permitted limits, the small cost of an LDC is worth the certainty
Cost and Process
In England, the LDC application fee is £206 (2026 figure; check the Planning Portal fee calculator as fees are subject to change). The LPA has 8 weeks to determine the application. The applicant must provide plans, dimensions, and any supporting evidence. Refusal of an LDC is not an enforcement notice — it simply means the LPA is not satisfied the works are lawful, and the applicant can appeal or revise the proposal.
Permitted development rights are a significant tool for homeowners, but they are bounded by a precise set of rules that have been amended repeatedly since 2015. The safest approach is to establish the original footprint of the house, check for Article 4 directions and planning conditions via the LPA’s portal, measure carefully against the relevant limits, and obtain a CLPUD before work begins if there is any doubt. The £206 fee is modest insurance against a much more costly dispute.
