Most contractor advice out there sounds like it was written by someone who has never set foot on a job site in Ballard or West Seattle. We will skip the fluff and talk about what it actually takes to hire someone to build your backyard cottage or basement apartment without losing your budget.
Building an Accessory Dwelling Unit in Western Washington is very different compared to standard home remodeling. Between damp Pacific Northwest winters, tricky hillside topography, and Seattle's strict Department of Construction and Inspections, you need a builder who knows the local rules inside and out.
The Core Questions You Need to Ask
Do not just nod along while a contractor talks a big game. You need to pin them down on specifics before any paperwork gets signed. Ask how many detached or attached backyard units they have actually completed inside city limits over the last two years. If they hem and haw or try to count a basic kitchen remodel as equivalent experience, walk away.
- Who pulls the permits and handles the Seattle DCI plan review process?
- Are your subtrades, like plumbers and electricians, licensed and bonded independent subs or random workers?
- Can I see a real, line-item budget from a recent project instead of a lump-sum estimate?
Decoding the Quote
A lowball quote is not a bargain. It is usually a trap. When you get a bid that is twenty percent lower than everyone else, someone is cutting corners on labor, materials, or basic site prep. Seattle ADU Solutions sees homeowners get burned by estimates that leave out essential items like utility hookups, sewer side sewer caps, or stormwater management compliance.
A proper quote should break down framing, foundation work, finishes, and allowances clearly. If the allowance for cabinets or fixtures is very low, you are going to get hit with massive change orders the moment you pick out mid-range finishes.
Red Flags That Mean Run
If a contractor asks for more than ten percent down before permits are issued, stop the process. Washington state law caps contractor deposits on residential work, and anyone demanding a large sum upfront before a shovel hits the wet Seattle clay is likely floating cash from your job to finish their last project.
Another warning sign is a lack of a physical office or a permanent local address. If they only communicate through a temporary phone number and a generic email address, it is very hard to track them down when something goes wrong six months down the road.
Checking Their Credentials
Never take a contractor's word for it when they say they are licensed and insured. Hop onto the Washington State Department of Labor & Industries website and look them up directly. You want to see an active general contractor registration, a clean bond, and valid workers' compensation coverage. Check their Unified Business Identifier number to see how long they have actually been in business under that exact name, because shady operators love to dissolve and re-form under a new moniker every time a dispute pops up.
Take your time and hire someone who treats your property with the same respect they would give their own home.