ADU Construction
Attached or detached accessory dwelling projects, subject to parcel feasibility and project review.
Plan the scope →Snohomish and King counties
Adu and addition scope planning
Use a clear scope and responsibility checklist before choosing a builder. ADU and addition project inquiries focus on Snohomish and King counties.
Home Additions
New living space with the existing-house connection and site work included in the scope discussion.
Plan the scope →Garage Construction
Garage and accessory-structure projects reviewed for intended use, access, and utilities.
Plan the scope →How to define the work
Record the drawing revision, project description, intended use, and finish selections sent to each bidder. Ask every estimator to identify assumptions. If one proposal uses a conceptual sketch and another uses reviewed plans, keep that difference visible. Do not treat those totals as prices for the same project.
The first review confirms project fit. Design, engineering, specialist assessments, permits, material selections, and construction responsibilities should be identified in the proposed scope. Availability and a final price require review of the actual property.
Compare Snohomish County ADU bids on one scope
Give each bidder the same drawings, specifications and known site findings. Separate construction work from design, engineering and permit coordination. Comparing totals before comparing inclusions can reward the bid that leaves the most work for someone else.
Expose allowances and exclusions
Create separate rows for utility work, access, foundations, finishes and owner-supplied items. Record provisional sums and the assumptions behind them. Ask how changes are priced and approved. This bid-comparison guide does not supply a parcel feasibility determination or professional design.
Carry the comparison into the contract
Resolve inconsistent quantities and missing responsibilities before accepting a proposal. Confirm progress payments, schedule assumptions and the agreed completion documents. Retain the annotated comparison with the final scope so an item discussed during estimating is not mistaken for a contracted inclusion.
The ADU and addition bid comparison worksheet
A low total can hide a smaller scope. Compare estimates only after identifying which drawings, assumptions, allowances, and responsibilities each one uses. This worksheet is a way to organize a decision, not a cost estimator.
Use the planning guide →Send your project details and include your location, priorities, and timing.