Search for what a project costs and you will find confident numbers immediately. Most of them are averages drawn across the entire country, and the country is not a useful unit for this.
Why national figures mislead in Washington
Labour rates in Seattle and in rural Yakima County are not the same. A roof in Spokane is engineered for snow load; a roof in Bellingham is not. A window specified for the Tri-Cities prioritises solar control; one for Spokane prioritises insulation.
Averaging across all of that produces a number that describes nowhere. Worse, the variation within Washington alone is large enough that a state-level figure is not much better than a national one.
Why we do not publish ranges
We could put numbers on these pages and they would probably get more traffic. We do not, because a figure that is true in Kirkland is misleading in Enumclaw, and a homeowner who anchors on a wrong number makes worse decisions than one who has no number at all.
What we publish instead is what drives the cost, which travels better and lets you interrogate a quote intelligently.
Sources worth using
Regional cost-versus-value reporting. Industry research on remodelling costs and resale value is published with regional breakdowns, which is considerably more useful than a national average. It is directional rather than precise, but the regional split matters.
Published wage data. Federal labour statistics publish occupational wage data by metropolitan area, including the construction trades. This tells you something real about why Seattle labour costs differ from Spokane labour costs.
Permit records. Some jurisdictions publish permit data including declared project valuations. It is imperfect — declared values are not final costs — but it is local and it is real.
Your own quotes. Three comparable quotes from verified local contractors are better data about your specific project than any published figure, because they price your actual house.
Using online calculators sensibly
They are not useless. They are useful for understanding the relative scale of different options — that metal roofing costs meaningfully more than asphalt, that a layout change costs more than a fixture swap.
They are not useful for budgeting. Treat them as showing you the shape of the decision rather than the size of the cheque.
What to do instead of researching a number
Understand the cost drivers for your project. Write a brief. Get three comparable quotes from contractors whose registration, bond and insurance you have verified. Ask each what they assumed and what their contingency rates are.
That process produces a real number for your actual house, which is the only number that matters. It takes longer than a search, and it is the difference between a budget and a guess.
A note on unusually low figures
If a published range sits well below what local contractors are quoting, the range is more likely to be wrong than every contractor in your area. National averages frequently lag current material and labour costs, and homeowners anchored on stale figures sometimes conclude they are being overcharged when they are simply reading old data.