Troy particulars
Only 11.7 percent of Troy's housing units predate 1960, though 60.5 percent predate 1980, among about 34,997 homes with a median value of $396,800. The Building Department is at 500 W. Big Beaver Rd, 248-524-3300, open 8 a.m. to 4:30 p.m. Its codes page says the 2015 Michigan Residential Code remains in effect after LARA agreed to pause the 2021 version, which settles which edition your contractor should be building to.
Troy's residential permit requirements talk about plot plans, grade slips and plans that include the foundation. Nothing we can cite addresses repairing a foundation or waterproofing one, and we have no Troy fee figure, so ask the department. A USGS atlas says former glacial lake beds appear as flat, clay-rich sediments in southeastern Oakland County, and EPA's ecoregion map puts Troy's center on the clayey Maumee Lake Plain; both are county-scale or regional readings, and we place Troy in that corner ourselves. Troy sits in Oakland County, EPA radon Zone 2. Clawson is 3.3 miles away and Birmingham 4.5.
Basement waterproofing in Troy: what to know
That makes Troy different from Ann Arbor, Dearborn and Livonia, which print waterproofing as a permit item. In Troy you must ask the Building Department. The plumbing permit, where a sump or interior drain is involved, can be applied for on its online system.
The county's former lake-bed clays are described by the USGS as having far lower permeability than outwash sediments, a regional note that may help explain slow drainage, though it is not a finding about your yard. UMN Extension suggests fixing interior moisture, grading and gutters before adding drainage; the waterproofing guide lays it out, and the permits guide compares cities.
Permits for basement waterproofing in Troy
Five of the ten cities in this set name waterproofing as a permit item, and the rest print no line, so ask your city.
Many cities run their own building department, so start by asking the City of Troy building department who issues foundation repair permits.
When a wet basement is an emergency
- Water is rising near the electrical panel, outlets or furnace. Stay out of the water.
- A wall is bowing or has cracked inward while wet.
- Damp patches or a musty smell in dry weather.
- A seep after heavy rain that drains away on its own.
What to check before you call about a wet basement
Try this first: ask if the sump or interior drain triggers a plumbing permit separate from any building permit.
- Run a humidity check and watch whether the damp shows on dry days; condensation looks like a leak in summer.
- Make sure downspouts end beyond the wall and the soil slopes away from it.
- Ask each company where the water enters and what it would try first.
What basement waterproofing costs
The estimate below is the Michigan-wide one, adjusted for Michigan wages and not for Troy in particular. The same table is on the basement waterproofing page. How we estimate costs. Prices as of Oct 19, 2026.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $4,375 to $13,500 per project | Built from 2 national published ranges, adjusted by the Michigan construction laborer median wage ratio (1.05). No Michigan foundation company price is shown, because none of the companies we looked at published a price we could count. |
| Estimated range per square foot, not a quote | $4 to $12 per square foot, interior system | Built from one national published range, adjusted by the Michigan construction laborer median wage ratio (1.05). No Michigan foundation company price is shown, because none of the companies we looked at published a price we could count. |
| Construction laborers, Michigan median | $49,590 a year | What workers are paid (BLS 2025 data via O*NET), not what you are charged. |
| Cement masons and concrete finishers, Michigan median | $59,860 a year | What workers are paid (BLS 2025 data via O*NET), not what you are charged. |
| Building permit, Ann Arbor | $15 application fee, then $100 plus $10 per $1,000 of project cost | Waterproofing is priced the same as a building permit, plus grading review. |
| Renovation permit, Dearborn | $100 plus $15 per $1,000 above $2,000, with a $100 processing fee | Plan review of $1 per $1,000 includes waterproofing. |
| Waterproofing application, Livonia | $45 administrative fee | Building permit and plan review fees are based on cost; we did not find the schedule. |
| Plumbing permit, Sterling Heights | $55 for basement waterproofing, plus a $55 application fee | 2026-27 plumbing chart. |
| Plumbing permit, Warren | $80 for basement waterproofing, $80 minimum | 2025 application. Warren's building fee sheet is dated 2014. |
| Plumbing permit, Westland | $50 for interior perimeter subsoil drainage and sump pit, plus $100 administration fee | Revised July 2026. |
How we estimate costs: the Estimated range row is a model, not a quote. It takes two published national ranges for this job (cost guides from third-party sites that we have not verified and do not cite) and multiplies them by Michigan's construction laborer median wage ratio to the US (1.05, BLS 2025 data read through O*NET OnLine). No permit fee is added: the city permit rows below are shown as printed. The wage and permit rows are what workers are paid and what a city's own schedule charges, and neither is a price. Your soil, water and the repair method move a real quote well outside any range, so get an independent diagnosis first. We have not collected quotes, and we found no Michigan foundation company that publishes a price we could count. Full method.
Questions about basement waterproofing
What is a waterproofed basement?
One where below-grade walls are treated to resist liquid water, not only dampness. The 2015 residential code calls for dampproofing in ordinary conditions and waterproofing where a high water table or severe soil-water conditions are known to exist.
How much does basement waterproofing cost in Michigan?
Our estimate for basement waterproofing in Michigan is $4,375 to $13,500 per project, or $4 to $12 per square foot, interior system. It is modeled from national published ranges, because we have collected no Michigan quotes. The University of Minnesota Extension ranks exterior drainage as the most costly and most effective option and gives no dollars. Ask for an itemized written price.
Does waterproofing a basement need a permit in Michigan?
In five of the ten cities in this set, yes, it is a named item: Ann Arbor, Dearborn, Livonia, Sterling Heights and Warren. Westland lists interior drains under plumbing. Ask your own building office.