Annexe / outbuilding in Kew
Kew is London Borough of Richmond upon Thames's edwardian (1900-1914) red-brick semis around kew gardens station submarket. Kew Gardens (the Royal Botanic Gardens) was inscribed as a UNESCO World Heritage Site in 2003, and the Buffer Zone extends roughly 250m into the surrounding residential streets including Mortlake Road, Kew Gardens Road, and Lichfield Road, which means any rear extension within the buffer needs an ICOMOS UK consultation, adding 4-8 weeks to consent.
What a annexe / outbuilding project looks like here
Kew Gardens (the Royal Botanic Gardens) was inscribed as a UNESCO World Heritage Site in 2003, and the Buffer Zone extends roughly 250m into the surrounding residential streets including Mortlake Road, Kew Gardens Road, and Lichfield Road, which means any rear extension within the buffer needs an ICOMOS UK consultation, adding 4-8 weeks to consent.
Richmond upon Thames's Kew Conservation Area covers Kew Green and the immediately surrounding Georgian terraces; the 2014 Article 4 Direction here strips Permitted Development rights for replacement windows and rear extensions, so even a like-for-like sash swap needs a full householder application.
The Edwardian semis around Kew Gardens station typically have rear-return kitchens at 3-3.5m projection, which means a side-return infill extension here can usually be designed within Permitted Development outside the CA, but the same scheme inside the CA always needs a full householder application.
Garden annexes, ancillary outbuildings and granny annexes — Permitted Development under Class E where the borough hasn't issued an Article 4 Direction; planning consent otherwise. In Kew specifically, edwardian (1900-1914) red-brick semis around kew gardens station stock means annexe / outbuilding scope is shaped by the neighborhood's dominant construction typology. Baily's London scoping flow factors kew gardens unesco world heritage site buffer zone and kew conservation area covers kew green and surrounding stock into the estimate before a contractor is involved.
Start your Kew scope — Baily asks the right questions.
Pre-seeded for annexe / outbuilding in Kew. Mention your 120-280 m2 (1,290-3,015 sqft), your timeline, and any known constraints — Baily factors the richmond upon thames building control + rut planning service review queue into the scope.
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Who is Baily?
Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.
He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.
That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.
Baily was a businessman before he was a scientist. That’s our vibe too.
Questions LA homeowners actually ask
Kew annexe / outbuilding projects typically run $95K–$285K. Kew's edwardian (1900-1914) red-brick semis around kew gardens station stock, combined with kew gardens unesco world heritage site buffer zone, puts most mid-complexity projects in the $190K range. Baily scopes the exact band once you describe the work.
Nearest neighborhoods
Same service, adjacent London submarkets.