Grade I listed · Welwyn Hatfield

North Mymms Park with Adjoining Garden Walls and Ha Ha

North Mymms Park with Adjoining Garden Walls and Ha Ha is a Grade I listed building in Welwyn Hatfield, first listed on 6 February 1952. It is one of 6 Grade I entries among 429 listed buildings in Welwyn Hatfield; 2% of Welwyn Hatfield’s current entries were listed before it.

List entry
Field	Value
Name	North Mymms Park with Adjoining Garden Walls and Ha Ha
Grade	Grade I — exceptional interest
List entry number	1100946
Date first listed	6 February 1952
Local planning authority	Welwyn Hatfield
Location	51.72391, -0.23834 (map)
Official record	Historic England list entry 1100946

Planning works on this listed building?

Planium checks which consents Welwyn Hatfield will require for your works on North Mymms Park with Adjoining Garden Walls and Ha Ha, lists what the heritage statement must cover and drafts the application text.

Ask Planium what consent you need

What the grade means for works

Grade I buildings are of exceptional interest — only about 2.5% of listed buildings in England. Any application for listed building consent is notified to Historic England, and alterations are scrutinised closely.

The protection covers the whole building, inside and out, plus fixtures and attached structures. Typical works that need consent: replacing windows or doors, removing walls or historic fabric, changing roof coverings, installing solar panels or external insulation, and adding extensions.

Listed buildings near North Mymms Park with Adjoining Garden Walls and Ha Ha

Name	Grade	Distance
The Stable Block at North Mymms Park	II	194 m
Ice House at North Mymms Park	II	291 m
Gate and Screen to North East Entrance to North Mymms Park Adjoining Churchyard	II	340 m
Kemble Tomb in Churchyard of Church of St Mary the Virgin	II	385 m
Church of St Mary the Virgin	II*	393 m
Gaussen Tomb in Churchyard of Church of St Mary the Virgin	II	399 m
Tomb on South Side of Chancel of Church of St Mary the Virgin	II	404 m
The Old Vicarage	II	417 m
Tomb South East of Church of St Mary the Virgin, Near Church Cottage	II	426 m
Church Cottage	II	432 m

Frequently asked questions

Is North Mymms Park with Adjoining Garden Walls and Ha Ha listed?

Yes. North Mymms Park with Adjoining Garden Walls and Ha Ha is on the National Heritage List for England as a Grade I listed building, list entry number 1100946, first listed on 6 February 1952. The full list entry with its description and map is on Historic England’s website.

Do I need consent for works to North Mymms Park with Adjoining Garden Walls and Ha Ha?

Works that affect its character as a building of special architectural or historic interest — inside or out — need listed building consent from Welwyn Hatfield, in addition to any planning permission or building regulations approval. Like-for-like repairs often do not, but confirm with the council’s conservation officer before you start.

Source: National Heritage List for England, © Historic England 2026, via planning.data.gov.uk. Contains Ordnance Survey data © Crown copyright and database right. Licensed under the Open Government Licence v3.0. Retrieved 12 October 2026. Local authority assigned from the list entry point. This page is a summary — the legal record is the official list entry.