A Wichita developer called us in April with a duplex infill on a 50×120 single-family lot and a three-month timeline problem. The city's planning commission met once a month, and the next two meetings already had full agendas — so even if he filed his special-use permit application that week, he'd be looking at a June hearing date at the earliest, then another two to four weeks for written findings, then building-permit submittal in July. His construction-loan rate lock expired in June. He asked if there was any way to permit the duplex without the planning-commission detour.
We told him to wait two weeks. Kansas had just passed S.B. 418 — the HOME Act — and we were waiting for Wichita's building department to update its internal procedures to match the new statute. When we called back in early May, the planner confirmed: duplexes are now allowed by right anywhere they're zoned, no special-use permit required, no public hearing. The developer filed his building-permit set the following Monday, got his first correction cycle back in three weeks, responded, and had stamps in hand by late June. He closed his construction loan on time and broke ground in July.
Kansas S.B. 418 eliminates discretionary hearings for four project types: single-family homes, duplexes, townhomes, and accessory dwelling units. If the project is zoned for that use and the drawings comply with code — setbacks, height, lot coverage, parking, structure — it's approved. No planning-commission calendar wait, no public testimony, no zoning-variance application, no special-use permit. The only review is building-code compliance, which happens at the building department on a rolling intake schedule instead of a once-a-month political meeting.
What "discretionary hearing" actually costs
Before S.B. 418, a typical duplex or ADU project in Kansas went like this: file a special-use permit or conditional-use permit application with the planning department (application fee $400–$800 depending on jurisdiction), wait four to eight weeks for the planning commission to calendar it, attend the public hearing (neighbors testify, commissioners ask questions about traffic or parking or "compatibility"), wait another two to four weeks for the commission to issue written findings, then — if approved — file the building permit. Total elapsed time from application to building-permit submittal: three to six months, depending on how many continuances the commission requested and whether any neighbors appealed.
The hearing itself wasn't just a time cost — it was a veto-point cost. We've had Kansas clients lose duplex projects entirely because a planning commission voted 5–4 to deny a special-use permit after neighbors complained about "density" on a lot that was already zoned for two units by the underlying ordinance. The denial wasn't based on code violations (the drawings met every dimensional standard), it was based on subjective concerns about neighborhood character that the commission had discretion to weigh. S.B. 418 removes that discretion for compliant projects — if it's zoned for duplexes and the drawings meet code, it's approved, period.
The timeline compression is significant for permit-set revenue. A duplex project that used to take six months from contract signing to permit issuance now takes six to eight weeks — the same speed as a single-family house. That means a developer who's buying four duplex permit sets a year (one per quarter, timed around planning-commission meetings) can now buy eight or ten sets in the same twelve months, because there's no three-month gap between filing and approval. For a drafting firm, that's 80–100% more repeat business from the same client base, without adding jurisdictions or marketing.
The lot-size reduction for smaller homes
S.B. 418 also reduces minimum lot-size requirements for single-family homes under 2,500 square feet. The statute doesn't specify the new minimum (that's left to local implementation), but the intent is to allow smaller starter homes on smaller lots without triggering a zoning variance. In practice, this means a Topeka or Lawrence subdivision plat that used to require 6,000-square-foot minimums for all single-family lots can now shrink lots to 4,000 or 5,000 square feet for homes under 2,500 square feet, fitting more units on the same land without changing the zoning designation.
That's a different kind of by-right reform — it doesn't eliminate discretionary review (subdivision plats still go through planning-commission approval in most Kansas cities), but it removes one of the most common variance requests that used to slow down plat approval. A developer who wants to build 1,800-square-foot starter homes on 4,500-square-foot lots no longer has to apply for a lot-size variance and attend a public hearing to defend it — the smaller lot is allowed by right under the HOME Act as long as the home is under 2,500 square feet.
For a civil or residential drafter working subdivision plats, this changes the lot-yield calculation. A 10-acre parcel that used to yield 60 lots at 6,000 square feet each (minus streets and common area) can now yield 75–80 lots at 4,500 square feet if the homes are under 2,500 square feet. That's a 25% increase in unit count on the same land, which changes the pro forma enough to make projects pencil that didn't pencil before. The developer still has to meet street-width, utility-capacity, and drainage requirements — but the lot-size constraint is gone for smaller homes.
How this compares to other state by-right mandates
Kansas is the eighth state to pass statewide by-right zoning for ADUs (after California, Oregon, Vermont, New Hampshire, Montana, Connecticut, and Virginia), but it's the first we've seen that extends by-right approval to duplexes and townhomes in the same statute. California's SB 9 (2021) allows lot splits and duplexes by right in single-family zones, but it's limited to parcels under 10,000 square feet in most cities and includes design standards (e.g., no demolition of rent-controlled units, 16-foot side-setback minimums) that don't exist in Kansas's HOME Act. Oregon's HB 2001 (2019) requires duplexes be allowed in single-family zones in cities over 10,000 population, but it doesn't mandate by-right approval — jurisdictions can still impose design review or conditional-use processes as long as the duplex is technically "allowed."
Kansas's approach is simpler: if it's zoned for the use and the drawings comply with code, it's approved. No design review, no conditional-use findings, no discretionary hearing. That's a brighter-line rule than California or Oregon, and it applies statewide to cities of all sizes (California's SB 9 and Oregon's HB 2001 both exempt smaller cities or allow delays in implementation).
The four-project-type list (single-family, duplex, townhome, ADU) also covers the bulk of small-scale residential permit work in Kansas. Single-family is already by-right in most jurisdictions (though the lot-size reduction is new), but duplexes, townhomes, and ADUs were almost always discretionary before S.B. 418. Now they're all on the same administrative track — file, get reviewed for code compliance, get stamped, done.
Who uses this first
Three client types get immediate value:
1. Infill duplex developers in Wichita, Overland Park, Lawrence. A developer who's been sitting on single-family lots in older neighborhoods waiting for zoning changes can now file duplex permits by right if the lots are zoned for multifamily or mixed-use. No special-use permit, no variance, no hearing. The only constraint is code compliance — setbacks, parking (typically two spaces per unit), height. A 50×120 lot that pencils at $240,000 revenue as a single-family house now pencils at $400,000 as a duplex, and the permit timeline is the same (six to eight weeks instead of four to six months).
2. ADU buyers adding rental income to existing single-family homes. Kansas homeowners in Johnson County or Sedgwick County who want to add a detached 600–800-square-foot ADU for rental income or aging parents no longer have to navigate a conditional-use process with neighbor testimony and planning-commission votes. If the site is zoned single-family and the ADU meets setbacks and height, it's approved. The $400–$800 hearing-application fee disappears, the three-month wait disappears, and the risk of denial based on neighbor opposition disappears. That changes the ROI calculation enough to make ADUs viable for middle-income homeowners, not just high-net-worth estate owners.
3. Townhome developers testing attached product in suburban markets. Townhomes used to require a PUD (planned unit development) or a rezone to multifamily in most Kansas suburbs, both of which involve discretionary hearings and months of negotiation with planning staff and commissioners. S.B. 418 allows townhomes by right if they're zoned for that use — so a developer working in Olathe or Lenexa can now file a townhome building permit the same way they'd file a single-family permit, as long as the underlying zoning allows attached units. That's a product type (3–6 attached units per building, individually owned, 1,400–1,800 sq ft each) that fits between single-family subdivisions and apartment complexes and didn't have a clear permitting path in Kansas suburbs before the HOME Act.
We've worked multifamily permits and ADU sets in enough states to recognize when a by-right statute actually removes friction versus when it just renames the approval process. Kansas S.B. 418 does the former — it takes four common project types off the discretionary track entirely and puts them on the building-code track, which runs faster and cheaper and doesn't have a neighbor-veto risk. If you're quoting duplex infill, townhome clusters, or ADU work in Kansas now, you lead with that: no hearing, no special-use permit, code-compliant drawings get approved. Everything else is just building department workflow.
Questions about how S.B. 418 applies to a specific Wichita or Overland Park site, or whether a townhome project qualifies as by-right under the new statute? We work Kansas permits regularly and track AHJ implementation as it rolls out — start here.