Guide · Lynnwood · Snohomish County · Updated July 2026
How many units can you build in Lynnwood?
If you own or are evaluating a residential lot in Lynnwood, 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 Lynnwood lots is now more than one. Lynnwood allows 3 units per lot by right in its RN district, rising to 4 with an affordable unit or near frequent transit.
Lynnwood at a glance: 3 units per lot by right, up to 4 with the city's bonus, plus up to 2 ADUs under HB 1337. Source: LMC 8.30.0320 (Ord. 3481).
What Lynnwood's adopted code allows
Lynnwood allows 3 units per lot by right in its RN district, rising to 4 with an affordable unit or near frequent transit. The base of 3 is above the state Tier 2 minimum; there is no 6-unit tier.
The details: 4 with one affordable unit or within a quarter-mile of a major transit stop. These are Lynnwood's city-wide standards, per LMC 8.30.0320 (Ord. 3481); 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 Lynnwood 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 Lynnwood address so you find this out before you make an offer, not after.
Get the exact number for your Lynnwood parcel
The figures above are Lynnwood'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 Lynnwood feasibility report →
Frequently asked
How many units can I build on a residential lot in Lynnwood?
Lynnwood allows 3 units per lot by right in its RN district, rising to 4 with an affordable unit or near frequent transit. That is per LMC 8.30.0320 (Ord. 3481). 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 Lynnwood?
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 Lynnwood's specific rule.
What unlocks the maximum in Lynnwood?
4 with one affordable unit or within a quarter-mile of a major transit stop.