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South East England

Garden room cost in Brighton

Insulated, year-round garden rooms used as home offices, gyms or studios — permitted-development friendly.

Local context — Brighton

Council
Brighton & Hove City Council
Open planning portal →
Cost premium
+6% vs UK average (South Coast labour premium + restricted access)
Typical extension price
A 25 m² single-storey rear extension in Brighton & Hove typically runs £60,000-£88,000 (standard to premium, 2026). Lower-ground-floor extensions in Regency squares (Kemptown, Hove) run £75,000-£120,000.
Building Control
Brighton & Hove Building Control is the council's in-house service; lead time 3-5 working days. Tight planning policy and 34 conservation areas push many homeowners to use private AIs for predictability.
Conservation & Article 4
Brighton & Hove has 34 conservation areas covering ~28% of the city — including all of Kemptown, Brunswick Town, Montpelier, Clifton Hill, Old Town and Preston Park. Article 4 directions are extensive; assume PD rights are removed in any pre-1939 street until confirmed otherwise.
Local quirks that move the price
Chalk subsoil across most of the city means foundations are usually shallow but always need an engineer's check for solution features. Coastal salt exposure south of the A259 requires 316-grade stainless fixings and pre-treated timber. Skip permits are heavily restricted in CPZ areas — expect £45-75/day plus suspension fees. Listed-building density in Kemptown means LBC is often needed even for internal works.
High-demand areas in Brighton
KemptownHovePreston ParkFivewaysHanover
Typical 15 m² project in Brighton
£28,173
to
£41,641
Mid-range (premium spec): £34,200
standard
£28,173
premium
£34,200
luxury
£41,641
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What's typically included

Garden room costs in Brighton — FAQs

How much does a garden room cost in Brighton?

Garden rooms in Brighton typically cost between £28,173 and £41,641 depending on size, specification and site conditions. A mid-range 15 m² project averages around £34,200.

How long will it take?

Most garden rooms 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 garden rooms fall under permitted development, but conservation areas, listed buildings and larger projects in Brighton 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.