Annexe / outbuilding in Neasden
Neasden is London Borough of Brent's 1930s art-deco semi-detached suburban stock submarket. The Welsh Harp Reservoir (Brent Reservoir) is a Site of Special Scientific Interest under Natural England, and any planning application within 100m of the reservoir boundary needs a Natural England consultation under the Wildlife and Countryside Act 1981, adding 4-6 weeks.
What a annexe / outbuilding project looks like here
The Welsh Harp Reservoir (Brent Reservoir) is a Site of Special Scientific Interest under Natural England, and any planning application within 100m of the reservoir boundary needs a Natural England consultation under the Wildlife and Countryside Act 1981, adding 4-6 weeks.
Wembley Park Opportunity Area Planning Framework covers the eastern edge of Neasden, and Mayor of London Stage 1 referral applies to any new building above 30m, adding 4-8 weeks to consent.
Neasden's 1930s art-deco semi-detached stock around Neasden Lane retains many original Crittall steel windows, and Brent's CA (where applicable) requires like-for-like Crittall replacement rather than uPVC, adding roughly £150-220/m2 to window-replacement costs.
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 Neasden specifically, 1930s art-deco semi-detached suburban stock stock means annexe / outbuilding scope is shaped by the neighborhood's dominant construction typology. Baily's London scoping flow factors wembley park opportunity area planning framework (eastern edge) and brent cil zone 2 rate band into the estimate before a contractor is involved.
Start your Neasden scope — Baily asks the right questions.
Pre-seeded for annexe / outbuilding in Neasden. Mention your 100-220 m2 (1,075-2,370 sqft), your timeline, and any known constraints — Baily factors the brent building control + brent 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
Neasden annexe / outbuilding projects typically run $95K–$285K. Neasden's 1930s art-deco semi-detached suburban stock stock, combined with wembley park opportunity area planning framework (eastern 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.