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South East England

Rear extension cost in Hastings

Single-storey rear extensions opening kitchens, dining and living space onto the garden — usually 30–50 m².

Local context — Hastings

Council
Hastings Borough Council
Open planning portal →
Cost premium
-4% vs UK average (South East labour, slightly below regional avg)
Typical extension price
A 25 m² rear extension in Hastings typically runs £52,000-£78,000 (standard to premium, 2026). Sea-front properties carry a 10-15% materials premium for salt-resistant finishes.
Building Control
Hastings shares Building Control with Rother District under the Hastings & Rother BC partnership. Inspection lead time is 2-3 working days; full-plans approval averages 4-5 weeks.
Conservation & Article 4
Hastings has 11 conservation areas including Old Town, Burton's St Leonards and the Pelham Place seafront. Article 4 directions cover much of the Old Town — even like-for-like window replacement needs consent.
Local quirks that move the price
Steep hillside sites in St Leonards and West Hill regularly add £8-15k for access scaffolding and material lift. Coastal exposure means specifying 316-grade stainless fixings and pre-treated timber on anything south-facing. Hastings has the second-highest density of listed buildings in East Sussex — always check before pricing.
High-demand areas in Hastings
Old TownSt Leonards-on-SeaSilverhillHollington
Typical 40 m² project in Hastings
£60,332
to
£97,110
Mid-range (premium spec): £78,714
standard
£60,332
premium
£78,714
luxury
£97,110
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Rear extension costs in Hastings — FAQs

How much does a rear extension cost in Hastings?

Rear extensions in Hastings typically cost between £60,332 and £97,110 depending on size, specification and site conditions. A mid-range 40 m² project averages around £78,714.

How long will it take?

Most rear extensions take between 6 and 16 weeks on site, depending on scope, structural complexity and planning requirements in South East England.

Do I need planning permission?

Many rear extensions fall under permitted development, but conservation areas, listed buildings and larger projects in Hastings can require a full planning application. Use the cost checker to see what applies to your address.

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Disclaimer: This is an industry-informed estimate for guidance only — not a fixed quote, valuation, survey or legal advice. Figures are based on regional averages and the details you provided. Site-specific factors (access, ground conditions, structural surprises, planning constraints) can materially change the cost. Always confirm with a site inspection, written quotes from qualified tradespeople, and supplier pricing before committing to work. Build Price IQ (trading under Services R Us Ltd) accepts no liability for any decisions, costs, losses or damages arising from the use of these estimates.