Wales: how permitted development differs from England

This article covers Wales only. The permitted development rights that apply to a house in Wales come from the Town and Country Planning (General Permitted Development) Order 1995, as amended for Wales, and not from the 2015 Order that applies in England. That single fact explains most of the permitted development Wales differences that catch householders out, because the English technical guidance, the English online calculators and the English "larger home extension" scheme simply do not apply on the Welsh side of the border.

A Welsh householder who reads English guidance will reach the wrong answer more often than not, and nothing about the two sets of rules signals which one you are reading.

Which Order applies in Wales

England's permitted development rights were consolidated into the 2015 Order. Wales kept the 1995 Order and has amended it separately, most substantially for householder development in 2013, when the Welsh Government took a different approach to measuring and limiting extensions rather than simply copying across the English figures.

So the starting point for any Welsh question is the consolidated text of the 1995 Order on legislation.gov.uk, together with the Welsh Government's own technical guidance for householders. Those documents, and the local planning authority, are the only reliable sources. Anything written for England is a source of error.

The structure is familiar: Schedule 2 divided into Parts and Classes, with Part 1 covering development within the curtilage of a dwellinghouse. The Class letters broadly correspond. The limits inside them do not.

Householder limits that differ

The differences fall into four groups, and it is the groups rather than the numbers that are worth carrying in your head.

Do not transpose English dimensions into a Welsh scheme. Read the figures from the Welsh Order itself for the Class you are relying on, and if the proposal is close to any limit, assume you are outside it until someone with the text in front of them says otherwise.

Rear extensions and the absence of larger home rights

England has a prior approval route allowing single storey rear extensions beyond the ordinary permitted depth, subject to a neighbour consultation scheme. Wales has no equivalent. There is no Welsh form on which to notify neighbours of a deeper extension, and no mechanism by which an authority can wave one through without a planning application.

The consequence is straightforward. A rear extension in Wales that exceeds the permitted depth in the 1995 Order needs a full householder planning application, with the fee, the drawings and the eight week determination period that go with it. Budget for the application rather than hoping for the English route.

That changes the design conversation early. Where an English client might push a kitchen extension to the limit of the prior approval scheme, a Welsh client is choosing between staying within permitted development or applying properly, and the second option opens up design freedoms that the first does not. Many Welsh extensions are better schemes for having gone through an application.

Outbuildings and curtilage limits

Garden rooms, home offices and garages are the other area where confusion is routine. The Welsh rules limit the proportion of the curtilage that may be covered by buildings, restrict height where a structure sits near a boundary, and exclude certain positions in front of the house.

Two points that hold in Wales as in England. The structure must be incidental to the enjoyment of the dwellinghouse, which means a garden office used as a business premises visited by clients, or a building used as separate living accommodation, is not covered by the outbuilding right at all. And curtilage coverage is cumulative, so earlier extensions, sheds and a garage built by a previous owner all count towards the limit.

Hard surfacing is worth checking separately. Welsh provisions on hard surfaces in front gardens, and on drainage of them, are their own small regime, and a large impermeable driveway is capable of needing permission.

Designated land in Wales

Restrictions tighten on designated land, and the Welsh designations are the three National Parks, the National Landscapes formerly known as Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites. Within those areas, side extensions, cladding, roof alterations and larger outbuildings commonly lose permitted development status.

Article 4 directions apply in Wales too, and Welsh authorities use them for the same purposes: protecting the character of a conservation area, controlling the loss of front boundary walls, and in some towns restricting changes of use. A direction is held by the authority and will not appear on a national dataset, so ask.

Listed buildings are governed by the same statutory consent regime, administered in Wales with Cadw's involvement for the more significant assets. Permitted development rights do not authorise works needing listed building consent, which is a point worth repeating because the two systems are independent.

Reading the Welsh text rather than English guidance

A short checklist for anyone working on a Welsh house.

1. Open the 1995 Order as it applies in Wales, not the 2015 Order.
2. Find the Class you are relying on, and read the whole Class, conditions included, rather than the limits alone.
3. Check the interpretation provisions, because terms such as curtilage, original dwellinghouse and principal elevation are defined and the definitions carry weight.
4. Check the Welsh Government technical guidance for householders for worked explanations.
5. Ask the local planning authority whether an article 4 direction applies to the property.
6. Check the planning history for conditions removing permitted development rights, common on estates built since the 1980s.
7. Confirm whether the property is listed or in a conservation area.

Our note on householder permitted development in Northern Ireland makes the same point for a third set of rules, which is a reminder that the United Kingdom has four householder regimes rather than one.

Confirming the position formally

A lawful development certificate is the only formal way to confirm that works are permitted development. The power sits in sections 191 and 192 of the Town and Country Planning Act 1990, which applies in Wales, with section 192 used for proposed works and section 191 for works already carried out.

The certificate application costs a fraction of a full application and produces a document a buyer's solicitor will accept. An email from a duty planning officer will not do that, and a conversation at a planning counter certainly will not. Where a Welsh extension is being built to the limit of a Class, the certificate is inexpensive insurance.

Illustrative example: a 1950s semi in a Welsh market town, outside any designation, where the owner wants a single storey rear extension and a garden room. The extension exceeds the Welsh permitted depth, so a householder application is needed. The garden room stays within the outbuilding limits, and the owner applies for a certificate under section 192 covering it, so that the two structures together can be shown not to breach the curtilage coverage limit. Both documents are on the file when the house is sold.

Where a planning application is needed, a Planning Statement addressing the relevant Welsh policy is the document that carries the case, and you can see which of the 66 report types a scheme is likely to need by entering the postcode on PlanScope. PlanScope's drafting is grounded in English national policy and local plans, so a Welsh application needs the reviewer to check Planning Policy Wales and the relevant technical advice notes.

This is general guidance, not legal advice. Permitted development limits in Wales are set by the 1995 Order as amended and change from time to time, so read the current text and check the position with your local planning authority before relying on it.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.