FAR (Floor Area Ratio)
The ratio of total building floor area to lot size — caps how much you can build.
Floor Area Ratio is calculated as total enclosed floor area divided by lot size. A FAR of 0.5 on a 6,000 sqft lot means you can build up to 3,000 sqft of enclosed floor area total (across all structures).
In the City of LA, R1 zones typically have a 0.45–0.6 FAR cap. ADUs receive a partial FAR exemption — the first 800 sqft of an ADU does not count against your FAR limit. This is what makes adding an ADU possible on lots that are already at maximum FAR.
Related terms
- ADU (Accessory Dwelling Unit)A self-contained second home on a residential lot, with its own kitchen, bath, and entrance.
- SetbackMinimum distance a structure must be from a property line.
- BMO (Baseline Mansionization Ordinance)City of LA rules limiting the size of single-family homes in non-hillside R1 zones.
People also ask
FAQ — FAR (Floor Area Ratio)
What does "FAR (Floor Area Ratio)" mean in plain English?
The ratio of total building floor area to lot size — caps how much you can build. Browse the full construction glossary for related terms.
Why does FAR (Floor Area Ratio) matter for a California ADU or remodel?
FAR (Floor Area Ratio) comes up in the zoning and land-use side of nearly every Greater LA and Bay Area project we touch. Floor Area Ratio is calculated as total enclosed floor area divided by lot size. Getting it right at design saves rework later — getting it wrong is one of the most common reasons permits stall. See how it lands in our five-phase process and the relevant field guides.
Where will I see FAR (Floor Area Ratio) on my own project?
Most owners run into FAR (Floor Area Ratio) during the design or plan-check phase — specifically inside schematic design or permit submittal. Your project manager flags it on the schedule, walks you through what the city expects, and confirms documentation is in place before the inspection that depends on it.
Does FAR (Floor Area Ratio) cost extra?
Sometimes — depends on whether it adds scope (a report, a structural detail, a fee) or just a paperwork step. Anything cost-impacting is itemized in your contract or change order, never buried in the invoice. Sanity-check your number with the ADU cost calculator and the 2026 cost report.
Who at Alpha Dream handles FAR (Floor Area Ratio)?
The project architect owns design-level decisions; the permit runner owns city interactions — see the California permit directory; the project manager owns field execution. You always know who to ask. Start a conversation on the contact page.
When does FAR (Floor Area Ratio) typically come up in the project schedule?
Most often during permit submittal or early construction. The full sequence is on the process page.
Is FAR (Floor Area Ratio) handled differently in LA vs the Bay Area?
Yes — local interpretation varies. The LA studio and Bay Area studio note the regional shifts on each city hub.
What documents prove compliance with FAR (Floor Area Ratio)?
City-specific — the California permit directory lists the form set per jurisdiction. Field journal entries show what actually clears plan check.
Which trades or consultants own FAR (Floor Area Ratio) on a typical job?
Architect, structural engineer, or Title 24 consultant — depends on the term. The process page maps roles across the five phases.
How does FAR (Floor Area Ratio) affect the project budget?
Direct line item in the contract when it triggers a report, detail, or fee. Pricing bands are in the 2026 cost report.
Has FAR (Floor Area Ratio) changed recently under California law?
California ADU and remodel law has shifted every legislative session since 2017. Material changes land first on the field journal; definitions update quarterly here.
Where can I read the underlying statute for FAR (Floor Area Ratio)?
Each glossary entry cites the relevant Gov Code, building code section, or city bulletin. The permit directorylinks the source portals.
Which ADU type is FAR (Floor Area Ratio) most relevant to?
Cross-references live on the ADU types index. The term often appears in detached ADU and JADU contexts most.
Can I send FAR (Floor Area Ratio) questions to your team?
Yes — use the contact page. We add the most-asked questions to the site-wide FAQ monthly.
What's a related term I should also read after FAR (Floor Area Ratio)?
Each entry cross-links 3–5 related terms. Browse the full set on the glossary index.
Plain EnglishOff-site · Leo replies tonight
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