Planning permission in Welwyn Hatfield
Welwyn Hatfield Borough Council decides planning applications in Welwyn Hatfield. This page shows the protected areas that affect what homeowners can build without planning permission, and the planning data Welwyn Hatfield publishes.
Conservation areas
Welwyn Hatfield has 9 conservation areas. In a conservation area, permitted development rights are reduced: side extensions, two-storey extensions, loft dormers and cladding all need planning permission, and many councils add Article 4 directions on top.
- Ayot Green
- Ayot St Lawrence
- Beehive
- Essendon
- Northaw Village
- Old Hatfield
- Peartree
- Welwyn
- Welwyn Garden City
Read more: extensions, loft dormers, garden rooms and solar panels in a conservation area.
Article 4 directions
Welwyn Hatfield hasn't published any Article 4 boundaries on planning.data.gov.uk. Most councils have at least one Article 4 direction, often in conservation areas, so check the council's website or ask its planning team before relying on permitted development.
What is an Article 4 direction?
National parks, National Landscapes and green belt
- There is green belt in or bordering Welwyn Hatfield. Householder permitted development rights apply as normal in the green belt, but if you need planning permission, green belt policy limits how much a home can be enlarged.
Listed buildings and protected trees
Listed buildings everywhere in England are recorded by Historic England, and the checker looks for them at every address. Welwyn Hatfield doesn't publish listed building outlines, so where a listed building is recorded near an address, we ask the homeowner to check whether it's theirs.
Welwyn Hatfield doesn't publish its tree preservation orders as data. If there are mature trees near your project, ask the council whether any are protected before you start.
What Welwyn Hatfield publishes
| Data | Status | Records |
|---|---|---|
| Conservation area boundaries | Published | 10 |
| Article 4 direction boundaries | Not published | 0 |
| Listed building outlines | Not published | 0 |
| Tree preservation order areas | Not published | 0 |
| Protected trees | Not published | 0 |
Planning work on a home in Welwyn Hatfield? Put a pin on your house and we'll check it against all of this.
Start a checkData from planning.data.gov.uk, published by Welwyn Hatfield Borough Council and national bodies under the Open Government Licence, last updated here on 30 October 2026. Welwyn Hatfield Borough Council website.