Grade I listed · Hounslow

Syon House Conservatory

Syon House Conservatory is a Grade I listed building in Hounslow, first listed on 15 June 1951. It is one of 32 Grade I entries among 512 listed buildings in Hounslow; 0% of Hounslow’s current entries were listed before it.

List entry
Field	Value
Name	Syon House Conservatory
Grade	Grade I — exceptional interest
List entry number	1358328
Date first listed	15 June 1951
Local planning authority	Hounslow
Location	51.47856, -0.31265 (map)
Official record	Historic England list entry 1358328

Planning works on this listed building?

Planium checks which consents Hounslow will require for your works on Syon House Conservatory, 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 Syon House Conservatory

Name	Grade	Distance
Stone Vases in Front of Syon House Conservatory	II	15 m
Garden Pedestal and Vase in Syon Park	II	42 m
The Dairy at Syon Park	II	46 m
Retaining Walls of Garden Pool, and Statue in Syon Park	II	61 m
Abbey Barn and Attached Wall and Gateway	II	84 m
Stables of Syon Park	II	102 m
Former Riding School of Syon Park	II	145 m
Sundial (Between Farm House Lodges)	II	160 m
Syon House	I	176 m
Gate Lodge to Syon House	I	211 m

Frequently asked questions

Is Syon House Conservatory listed?

Yes. Syon House Conservatory is on the National Heritage List for England as a Grade I listed building, list entry number 1358328, first listed on 15 June 1951. The full list entry with its description and map is on Historic England’s website.

Do I need consent for works to Syon House Conservatory?

Works that affect its character as a building of special architectural or historic interest — inside or out — need listed building consent from Hounslow, 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.