Guide · Lake Forest Park · King County · Updated July 2026
How many units can you build in Lake Forest Park?
If you own or are evaluating a residential lot in Lake Forest Park, the first question is almost always the same: how many homes can legally go on it? Since Washington's HB 1110 middle-housing law took effect, the answer for most Lake Forest Park lots is now more than one. Lake Forest Park allows 2 units (duplexes) per lot, the state minimum, with no transit or affordability bonus tier.
Lake Forest Park at a glance: 2 units per lot — a flat allowance, no transit or affordability bonus tier, plus up to 2 ADUs under HB 1337. Source: LFPMC (Ord. 25-1310).
What Lake Forest Park's adopted code allows
Lake Forest Park allows 2 units (duplexes) per lot, the state minimum, with no transit or affordability bonus tier.
The details: none — the city adopted only the state minimum; no transit tier. These are Lake Forest Park's city-wide standards, per LFPMC (Ord. 25-1310); the exact figure for a specific parcel — its zone, lot size, transit proximity, and critical areas — is what a Civexa report resolves.
What actually fits: floor area, height, and setbacks
HB 1110 and the city code set the right to a number of units; the zone's building envelope sets what physically fits. Floor-area ratio, lot coverage, height, and setbacks together decide whether those homes pencil as detached cottages, a townhouse row, or a stacked-flat building. Civexa computes this envelope for Lake Forest Park zone by zone, so the unit count you see is one the zoning can actually hold.
What can shrink it: critical areas
Steep slopes, wetlands, streams, and flood zones can override the unit math on a specific parcel. A lot that qualifies for the maximum on paper may be constrained once environmentally critical areas are mapped. Civexa screens FEMA flood, slope, and county critical-area layers for every Lake Forest Park address so you find this out before you make an offer, not after.
Get the exact number for your Lake Forest Park parcel
The figures above are Lake Forest Park's city-wide rules. The number that matters is the one for your address — its zone, lot size, transit proximity, and critical areas. Civexa turns that into a full feasibility report in about a minute: unit count, buildable envelope, a preliminary pro forma, utilities, and permit path.
Run a Lake Forest Park feasibility report →
Frequently asked
How many units can I build on a residential lot in Lake Forest Park?
Lake Forest Park allows 2 units (duplexes) per lot, the state minimum, with no transit or affordability bonus tier. That is per LFPMC (Ord. 25-1310). The exact number for a specific parcel still depends on its zone, lot size, transit proximity, and critical areas — run a Civexa report for the parcel-level figure.
Can I add ADUs on top of that in Lake Forest Park?
Washington's HB 1337 allows up to two accessory dwelling units on a residential lot. In some cities they count toward the middle-housing total and in others they are separate — your Civexa report applies Lake Forest Park's specific rule.
What unlocks the maximum in Lake Forest Park?
None — the city adopted only the state minimum; no transit tier.