A boundary line adjustment moves existing property lines without creating an additional legal parcel. A short plat creates new lots within the jurisdiction’s short-subdivision limit. Start by telling us which result you need.
The distinction affects your survey scope, application, review process, and schedule. We’ll help you establish the existing parcels and identify the questions to resolve with the jurisdiction before detailed design begins.
Tell us what you want the property to do
You might need to move a line away from a garage, transfer a strip of land to a neighbor, or divide a property into separate development lots. Those goals can begin with similar sketches and lead to different approval paths.
Send us a marked plan and a plain-language description of the intended result. Include the number of existing parcels, the proposed number, and what will happen to the land after the change.
Don’t choose the process because its name sounds simpler. Choose it because it produces the legal configuration your project needs.
When a boundary line adjustment fits
A boundary line adjustment may fit when you need to reconfigure adjoining parcels without increasing the number of parcels.
Washington’s subdivision law exempts qualifying adjustments from the subdivision chapter when they create no additional parcel and no parcel with insufficient width or area for a building site. The local jurisdiction applies its own approval criteria.
Seattle calls this a lot boundary adjustment. Its property-line guidance confirms that the process cannot create a new lot and that the resulting lots must satisfy applicable land-use and building requirements.
Moving a line can still require substantial work. We may need to research descriptions, locate monuments, map improvements, and prepare revised legal descriptions. Your title company, lender, or attorney may also need to review the proposed change and related documents.
When a short plat fits
A short plat creates new legal lots through the local short-subdivision process. The permitted lot count and approval requirements depend on state law and the city or county.
Seattle’s platting guidance describes short subdivisions of up to nine parcels, with public comment, a director’s decision, and an appeal process. Larger divisions follow a different process. Confirm the applicable path for your property before building the schedule around it.
The review can reach well beyond the new lines. Access, utilities, drainage, frontage improvements, critical areas, and existing buildings may determine whether the proposed lots work.
Check what the new lines would change
A parcel can meet an area requirement and still have a problem with width, access, setbacks, or utility rights. Test the whole layout.
- Buildings: check walls, eaves, decks, stairs, and other improvements near proposed lines.
- Access: confirm each parcel has the physical route and legal rights it needs.
- Utilities: identify service lines or facilities that would cross the new boundaries.
- Drainage: account for shared systems and maintenance access.
- Site constraints: include critical areas, shorelines, easements, and rights-of-way.
- Parcel history: review earlier divisions and any restrictions on further subdivision.
A driveway or utility line that crosses the proposed boundary may need an easement. A building too close to the new line may raise setback or fire-separation questions. Identify those conditions while the layout can still change.
Establish the boundary before designing around it
Assessor mapping is useful for orientation. It does not establish the boundary you should use for a parcel change.
We review the records and field evidence to determine the relevant lines. That work can reveal a description conflict, an improvement near a boundary, or an easement that changes the usable area.
The first survey does not have to answer every future construction question. It should answer the questions that control feasibility: what parcels exist, where the boundaries fall, which improvements matter, and what rights affect the proposed layout.
When access, drainage, or utilities could control the result, bring civil engineering into the discussion early. The new parcel arrangement and the infrastructure need to work together.
Confirm the application and recording sequence
Start with the property facts and the intended change. Then confirm the local process, survey requirements, supporting documents, and approval conditions.
For Seattle short plats, Tip 213A is a useful starting point. SDCI notes that some guidance may lag regulatory changes, so the project team should confirm current requirements with the agency.
Allow time for survey, design coordination, jurisdiction review, title or lender requirements, and recording. An approved concept sketch does not by itself complete the parcel change. Confirm the final documents are properly recorded before relying on the new configuration for a transaction or later permit.
What to send us
You can use this brief to start the scope discussion:
- Property: address, parcel numbers, jurisdiction, and current owners.
- Records: deeds, title report, exception documents, prior surveys, and recorded plats.
- Objective: the reason for the change and how the resulting parcels will be used.
- Concept: a sketch showing existing and proposed lines.
- Improvements: current plans and known building, access, utility, or drainage conflicts.
- Schedule: design, permit, financing, or sale milestones.
- Team: contacts for the architect, civil engineer, planner, title officer, and attorney as applicable.
If you don’t know whether the concept creates a new legal lot, say so. We can help define a focused feasibility review before you commit to a full application scope.
Common questions
Can a boundary line adjustment create another building lot? It cannot create an additional legal parcel. It may change the configuration of existing parcels, subject to local approval.
Does every new lot qualify for a short plat? No. Lot count, parcel history, state law, and local requirements determine the available process. A larger division may require a full subdivision.
Can we start with assessor lines? Use them for orientation and an initial conversation. Confirm the boundaries through survey work before relying on them for design or application drawings.
Will a boundary adjustment be faster? The scope and review requirements decide the schedule. Even without a new lot, buildings, easements, title issues, or site constraints can require significant coordination.
Ready for a scope?
Just punch the pulsing green button, fill out a few questions, and we’ll get right to work on your estimate. Because time is the measure.
