Permit record · Maryland
What Montgomery County paid for a adu / guest house
Not an estimate. We read 61 permits filed with Montgomery County and took the value written on each one.
Half of these jobs landed between $37,000 and $200,000. One in ten came in under $25,000; one in ten ran past $352,000.
The same job, other cities
| City | Median | Typical range | Permits |
|---|---|---|---|
| Montgomery County, MD | $65,000 | $37,000 – $200,000 | 61 |
| Seattle, WA | $217,740 | $188,034 – $497,277 | 1,230 |
| Everett, WA | $177,174 | $81,370 – $262,177 | 94 |
| San Francisco, CA | $165,000 | $80,000 – $225,000 | 172 |
| Corona, CA | $154,901 | $87,754 – $195,138 | 89 |
| Sacramento, CA | $123,470 | $80,483 – $186,075 | 38 |
| Raleigh, NC | $112,656 | $94,772 – $141,383 | 69 |
| Los Angeles, CA | $100,000 | $60,000 – $160,000 | 4,142 |
| Chicago, IL | $94,100 | $50,000 – $188,864 | 51 |
| New York, NY | $90,000 | $55,000 – $200,225 | 94 |
Across the cities we cover, the same job runs from $65,000 in Montgomery County to $217,740 in Seattle — a 3.3× spread. See all cities →
Other projects in Montgomery County
| Project | Median | Permits |
|---|---|---|
| Solar Panels | $24,000 | 3,334 |
| Deck or Patio | $15,708 | 2,168 |
| Kitchen Remodel | $64,000 | 964 |
| Home Addition | $113,965 | 851 |
| Bathroom Remodel | $27,000 | 650 |
| Swimming Pool | $100,000 | 233 |
| Roof Replacement | $29,838 | 226 |
| Garage | $33,500 | 220 |
| Interior Remodel | $84,000 | 89 |
Source
Source: Montgomery County MD — Commercial and Residential Building Permits. Permits issued in the last 24 months, classified by the work described on the permit. The figure is the declared value of the work — what the applicant reported to the city. It excludes work done without a permit and can sit below a final invoice. Read the full methodology. Data refreshed 2026-09-04.