Annexe / outbuilding in Earlsfield
Earlsfield is London Borough of Wandsworth's edwardian (1900-1914) red-brick bay-fronted terraces and 1930s semi-detached suburban stock submarket. Earlsfield's eastern terraces sit in Environment Agency Flood Zone 2 or 3 along the Wandle, so any basement scheme here needs a flood risk assessment under National Planning Policy Framework Annex 3, adding roughly 4-6 weeks to consent.
What a annexe / outbuilding project looks like here
Earlsfield's eastern terraces sit in Environment Agency Flood Zone 2 or 3 along the Wandle, so any basement scheme here needs a flood risk assessment under National Planning Policy Framework Annex 3, adding roughly 4-6 weeks to consent.
The Magdalen Park Conservation Area covers the western terraces around Magdalen Road, which removes Permitted Development rights for replacement windows and front-elevation alterations, so a like-for-like sash window swap now needs full householder consent.
Many of the Edwardian terraces here were built on made-up ground over the original Wandle floodplain, so foundation surveys often find ash and clinker fill at 0.6-1.2m depth; rear extensions routinely need pile foundations rather than spread-footing under Building Regs Approved Document A.
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 Earlsfield specifically, edwardian (1900-1914) red-brick bay-fronted terraces and 1930s semi-detached suburban stock stock means annexe / outbuilding scope is shaped by the neighborhood's dominant construction typology. Baily's London scoping flow factors magdalen park conservation area on the western edge and wandsworth local plan lp4 caps rear extensions at 4m projection into the estimate before a contractor is involved.
Start your Earlsfield scope — Baily asks the right questions.
Pre-seeded for annexe / outbuilding in Earlsfield. Mention your 110-200 m2 (1,180-2,150 sqft), your timeline, and any known constraints — Baily factors the wandsworth building control + wandsworth 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
Earlsfield annexe / outbuilding projects typically run $95K–$285K. Earlsfield's edwardian (1900-1914) red-brick bay-fronted terraces and 1930s semi-detached suburban stock stock, combined with magdalen park conservation area on the western edge, 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.