ADU / accessory dwelling in Alt-Wiedikon
Alt-Wiedikon is Stadt Zürich — Kreis 3's wilhelminische mietshäuser 1890-1910 submarket. Alt-Wiedikon sits in the W4-Zone and the Stadt Zürich Bauordnung allows a +1 Stockwerk Aufstockung on most Wilhelminische Mietshäuser — but the trade-off is a strenge Mehrwertabgabe of 40% of the planning gain, which can erode the projected Vermietungs-rendite on a marginal Aufstockung project.
What a adu / accessory dwelling project looks like here
Alt-Wiedikon sits in the W4-Zone and the Stadt Zürich Bauordnung allows a +1 Stockwerk Aufstockung on most Wilhelminische Mietshäuser — but the trade-off is a strenge Mehrwertabgabe of 40% of the planning gain, which can erode the projected Vermietungs-rendite on a marginal Aufstockung project.
Birmensdorferstrasse and Schmiede Wiedikon mietshaus-cohort fell into the post-Reformierung Erstsanierungs-Welle of the 1990s, which used Spritzasbest-haltige Fassadenkleber on a known cohort — a pre-Baugesuch Asbest- und KMF-Untersuchung TRGS 519 is now standardised here.
Zurich ADUs — detached, attached, and conversion paths — scoped against Hochbauamt Zurich + SIA 380/1 + KBOB setback + height + parking variances. In Alt-Wiedikon specifically, wilhelminische mietshäuser 1890-1910 stock means adu / accessory dwelling scope is shaped by the neighborhood's dominant construction typology. Baily's Zurich scoping flow factors stadt zürich bauordnung w4 and lärmschutzverordnung birmensdorferstrasse empfindlichkeitsstufe iii into the estimate before a contractor is involved.
Start your Alt-Wiedikon scope — Baily asks the right questions.
Pre-seeded for adu / accessory dwelling in Alt-Wiedikon. Mention your 65-140 m², your timeline, and any known constraints — Baily factors the stadt zürich — amt für baubewilligungen (afb) 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
Alt-Wiedikon adu / accessory dwelling projects typically run $255K–$750K. Alt-Wiedikon's wilhelminische mietshäuser 1890-1910 stock, combined with stadt zürich bauordnung w4 — aufstockung +1 stockwerk möglich, puts most mid-complexity projects in the $503K range. Baily scopes the exact band once you describe the work.
Nearest neighborhoods
Same service, adjacent Zurich submarkets.