Land by postcode · BN area · BN18
What the open records say about the BN18 postcode district in West Sussex: recent sales, planning designations and controls, and the council that decides applications. District-level facts to read before you sell or develop a plot in Arundel.
Residential sales recorded by HM Land Registry between 2024-08 and 2026-07. This is market context for the district, not a land valuation: what a plot is worth depends on what can be built on it, which these figures do not show.
Sales in 24 months
580
Median sale price
£390,000
Median £ per m² of floor area
£4,033
Median, last 12m vs prior 12m
+1.3%
£390,000 → £395,000
Mix of sales: 39% detached, 26% semi-detached, 25% terraced, 9% flats.
New-build sales 2023–2024: 361 of 725 (50%). A rough proxy for recent building activity: these are homes sold by builders, not development sites.
For each designation on the planning.data.gov.uk register, the share of the 588 live postcodes in BN18 whose centroid falls inside it. This measures postcodes, not land area, and says nothing about any individual plot.
129 of 588 postcodes
South Downs
134 of 588 postcodes
Arundel · Walberton Village and Walberton Green · Slindon · Amberley Conservation Area · Burpham and Wepham and 3 more
11 of 588 postcodes
1 separate direction recorded, each removing particular permitted development rights within a defined area.
No postcodes in BN18 fall inside: Green Belt, National Landscape (AONB).
Flood zones, tree preservation orders, local plan allocations, settlement boundaries and non-designated heritage are not included here and are checked in a full assessment.
22% of postcodes are inside a National Park. In those areas national policy gives great weight to conserving landscape and scenic beauty, and major development is expected only in exceptional circumstances.
23% of postcodes fall within a conservation area. Inside one, demolition needs consent, some permitted development rights are reduced, and new work is assessed against the character and appearance of the area.
These are district-level facts. The free assessment checks your actual boundary against the same registers and the local plan and tells you plainly what they mean for your plot.
Arun covers 95% of the sampled postcodes in BN18.
Draw your boundary, tell us what you own, and an architect checks it against these registers and the local plan. Free, no obligation, and you get a straight written answer.
It depends on where the plot sits, not on the district average. In BN18, 0% of postcodes are in the Green Belt, 23% in a conservation area. Outside those designations the questions that decide it are whether the plot is inside or adjoining the settlement boundary in the local plan, whether it has its own road access, and what is next to it. A plot on the edge of a village or town with access has the best chance; an open field outside the settlement boundary rarely gets consent for housing whatever the market is doing.
Often, yes. 2% of postcodes in BN18 are under an Article 4 direction (1 separate direction), which withdraws particular permitted development rights, so an outbuilding, extension or change of use that is automatic elsewhere needs an application there. Outside those areas, permitted development applies to houses and their gardens but not to agricultural land or paddocks, where a new building or a new use normally needs permission or prior approval.
Developers look at three things before they talk about price: whether the plot is outside the Green Belt and any National Landscape, whether it sits inside or beside the settlement boundary, and what finished homes sell for. In BN18 the median sale is £390,000, and 50% of 2023–2024 sales were new-build homes, so builders are active here. A single plot usually goes to a local builder or a self-builder; a site for five or more homes attracts regional housebuilders, normally through an option or a conditional contract rather than an outright purchase, so the price you see quoted is not the price you receive.
There is no district figure for land, because a plot's value comes from what can be built on it, not from where it is. As a guide, a serviced plot with consent for one house commonly sells for around a third of the finished house value, which in BN18 would be measured against a £390,000 median sale. The same plot without consent, or inside the Green Belt, is worth a small fraction of that, and a paddock with no realistic route to consent is worth agricultural or amenity value only. The free check tells you which of those your plot is before you talk to anyone about a price.
Three places: Arun's local plan and its policies map for the settlement boundary and allocations, the council's planning register for what has been approved or refused on neighbouring land, and planning.data.gov.uk for the national designations. That is an evening's work if you know what you are looking for. The alternative is to draw your boundary on this site: an architect checks it against the same records and writes back within 48 hours with a plain answer, free and without obligation.
Computed from open-data records; district-level, not plot-level measurements. Sales: HM Land Registry Price Paid Data (2024-08-01 to 2026-07-31), © Crown copyright, Open Government Licence. Designations: planning.data.gov.uk (OGL), retrieved 2026-09-05; conservation areas and Article 4 directions are made locally and published on that national register. Postcode centroids: OS Code-Point Open 2026.3.0, contains OS data © Crown copyright and database right 2026. Place name is the most common post town in the sales records. Figures computed 2026-09-06.