ADUs Cost Guide in Hillsboro — Average Prices & Ranges

Last updated October 5, 2026

For a Hillsboro address, plan on $1,418 to $4,396 per job for adu, with the midpoint near $2,497.

What you pay in Hillsboro tracks the going rate for trades across Oregon, plus any travel or permit charge the job attracts. Two quotes for identical work can still differ.

Typical cost at a glance

United States planning figures, per job
Level	Price
Low	~$1,418
Typical	~$2,497
High	~$4,396

Cost by type

Type	Low	Typical	High
Baseline transaction cost	~$1,418	~$2,907	~$4,396
Below-median price scenario	~$1,163	~$2,626	~$4,088
Above-median price scenario	~$1,588	~$3,827	~$6,066
Lender and government fees	~$170	~$679	~$1,187
Competitive or fast-moving market	~$1,730	~$4,206	~$6,682

All figures per job.

What moves the price of adu

Labour, materials and timing explain most of the gap between two quotes for adu. Access and preparation often matter as much as the headline task, so a job that needs extra setup or a second visit costs more even when the base price looks identical.

How adu pricing varies around Hillsboro

The Hillsboro market for adu moves with local demand. When several providers are busy, quotes drift toward $4,396; when schedules are open, they settle nearer $2,497.

Timing your adu

For adu, same-day and after-hours call-outs sit at the top of the range. A standard appointment booked in advance gives you the best chance of the typical figure.

What ADUs typically costs

Plan around a $1,418–$4,396 per job band for adu in Hillsboro. A typical job is near $2,497, and the gap between the two ends is where scope, materials and timing do their work.

Getting quotes for adu

Get at least three written quotes for adu before committing. Written quotes force providers to state scope, price and exclusions, which makes them directly comparable.

How to compare quotes for adu

When you compare quotes for adu, line up the scope, the materials and the timeline rather than just the totals. Ask each provider what would make the price rise after the quote is accepted.

Frequently asked questions

How much does adu cost?

Most adu falls between $1,418 and $4,396, with a typical figure near $2,497 per job. The low end is a straightforward job with no surprises; the high end covers complex scope, premium materials or urgent timing. It is worth testing that against a couple of quotes in Hillsboro.

What affects the price of adu?

No single factor decides it — scope, materials, access and timing all move the total, and the biggest swings usually come from access and scheduling. Local providers in Hillsboro can confirm how that applies to your area.

Is ADUs cheaper in smaller cities?

Often, but not always. Smaller markets can carry a travel or availability premium that offsets a lower local rate, so it is worth checking a nearby city before assuming the lowest published figure applies to you. In Hillsboro, that is worth confirming with a local provider before you commit.

How many quotes should I get for adu?

Two or three written quotes are enough to see the real market range. Compare the same scope side by side, and ask each provider what is excluded and what would change the price after the quote is accepted. The answer can shift with the Hillsboro market, so check locally.

Keep comparing

Related categories

Real Estate

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Cities in this region

These are planning ranges drawn from public price data and market research. They are not a quote, an offer or financial advice, and your actual price depends on the provider, the location and the scope of the work.