BeforeIBuyHonest. Maybe too honest.
№ 07 / 09 · Planning

Can I extend a house in Southbourne?

For anyone buying or renting in Southbourne.

Mostly yes, unless you bought in Prinsted. Twenty-one listed buildings, mostly churches and a mill. One conservation area, at Prinsted. Most homes are post-war and unlisted. Plenty of room to extend if you stayed out of the postcards.

The listed-buildings count for the area sits at twenty-one. None of those are Grade One, the top tier reserved for buildings of exceptional national importance. One is Grade Two Starred, which marks particularly significant historic buildings short of national-monument status. The remaining twenty are Grade Two, the standard tier for buildings of special interest. The names give the pattern away: the parish churches of Saint John the Baptist, Saint Mary, Saint Nicholas and the Holy Trinity sit on the list, along with Racton Church and the Church of Saint Mary at Chidham. Lumley Mill is on the list. Middleton House, Westbourne House and The Old House are on the list. What that tells you is that the heritage protection sits mainly on the institutional and grand stock, not on the rows of ordinary village houses. Owning a listed building is its own world, with consent required for almost any change to the external or significant internal fabric, but the buyer of an average post-war or Victorian semi here is not in that world.

One conservation area sits within the village boundary, covering Prinsted south of the main road towards Chichester Harbour. That area is characterised by thatched-roof properties and a tighter cluster of historic stock than the rest of the village. Living in a conservation area does not freeze a building, but it does add a planning layer. Routine work that would be permitted development elsewhere can require formal consent inside the boundary. External changes that affect the area's character are scrutinised harder. Tree work often requires notification. The conservation-area machinery exists to preserve the look of the place that makes it valuable, which means buyers in Prinsted should price for additional planning friction and longer timelines on anything visible from the street.

In practical terms, the dominant story for most buyers here is freedom rather than constraint. The majority of the housing stock is unlisted post-war semi-detached and detached homes outside any conservation area. Standard permitted-development rights apply, which covers most rear extensions, loft conversions and ground-floor enlargements within the published volume limits. The village has seen around six hundred and forty-five planning applications across the most recent twelve-month window, which is a healthy throughput for a place this size and tells you the system is open for business. The exceptions are the listed properties, the Prinsted conservation area, and the slice of the parish that falls within the Chichester Harbour Area of Outstanding Natural Beauty, where additional protection applies even to unlisted homes. Around twelve percent of the area sits within that protected-landscape designation, which can affect external changes even if a house carries no listing.

Freedom to extend lands at average overall. Most buyers can extend without major friction because most homes are unlisted and outside Prinsted. The buyers near the harbour, in the thatched cluster, or inside a listed building are looking at a planning conversation that runs longer and lands more carefully. Choose the postcode if the extension matters; the planning office knows which side of the line you bought on.

Sources: Local council planning registers · Historic England · Natural England

Data to May 2026 · Figures checked 26 June 2026 (what this means)