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How long does it take to finish a basement?

Six weeks for a standard finish, eight to ten for a legal apartment — if the project is run on a schedule. Here's exactly where those weeks go, and the three things that quietly add a month when nobody's managing them.

The week-by-week timeline

Week	What happens	Inspections
Before week 1	3D design, fixed bid, permit application (city review runs 1–3 weeks — overlapped with planning, so it rarely adds calendar time)	—
Week 1	Materials staged, framing goes up — the fastest visual progress of the project	—
Weeks 2–3	Electrical, plumbing, and HVAC rough-ins by licensed trades; egress window cut if needed	4-way rough inspection
Week 4	Insulation, then drywall: hang, tape, mud, texture	Insulation + drywall screw
Week 5	Paint, doors, trim, cabinets — the “it looks like a house now” week	—
Week 6	Flooring, fixtures, hardware, punch list	Final inspection

What actually causes delays

Trade scheduling gaps. The #1 killer. A one-crew contractor fits your job between bigger ones — a three-day gap between framing and electrical becomes ten. This is most of the difference between six weeks and four months.
Late selections. Tile, flooring, and cabinet choices made after the build starts stall the finish weeks. We lock selections at design, before the bid.
Change orders mid-build. Moving a wall in week 3 costs triple what it costs on paper in week 0 — another argument for a real 3D design up front.

Apartments take 8–10 weeks

A legal basement apartment adds a kitchen, a separate entrance, fire separation, and a city registration — roughly two to four extra weeks, mostly in the kitchen and the entrance work.

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