Basement Waterproofing cost in Spokane, WA
Spokane, WA · updated August 2026
$8,700
Typical local cost
$3,200 – $19,000
Typical range
- per linear foot of drain installed
- $50 – $150
- Permit
- It depends
- Typical timeline
- 2-5 days of work
Installed, local pricing
$0 – $410 in fees
2-5 days of work
Spokane runs +6% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for Spokane is $8,700. The local adjustment for this trade is x1.056 — driven mainly by Spokane County labor rates and 20% exposure to local code requirements.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 45 linear foot of drain installed | $2,300 – $6,800 |
| 60 linear foot of drain installed | $3,000 – $9,000 |
| 75 linear foot of drain installed | $3,800 – $11,300 |
| 100 linear foot of drain installed | $5,000 – $15,000 |
| 130 linear foot of drain installed | $6,500 – $19,500 |
Based on Spokane pricing of $50–$150 per linear foot of drain installed.
Where the money goes
- Labor
- $4,800
- 54% of median
- Materials
- $3,900
- 44% of median
- Permit & fees
- $205
- 2% of median
Spokane project costs+6% vs U.S. average
Based on Spokane County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Spokane building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
2-5 days of work
05
Inspection
Plumbing inspection where a sump discharge is added
06
Closeout
Final sign-off, warranty and documentation
Spokane labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$77–$100
Structural crews in Spokane County · +6% vs U.S. ($82/hr)
Typical crew
3 × 2.5 days
On-site time for a typical waterproofing job here.
Labor in the price
$4,800
55% of the median — the rest is material, disposal and permit.
Because labor is 55% of this job, Spokane wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national structural crew rates adjusted by the Spokane County labor factor (x1.065). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Spokane differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates+$300
Spokane County crews price 6% above the national average, and labor is 55% of this job.
Material and delivery+$100
Materials are nationally traded, so they move less — but delivery into this market runs 3% over baseline.
Code and inspection load+$50
Basement Waterproofing carries 20% exposure to local code requirements, and this jurisdiction's review load indexes at x1.04.
Basis: Decomposition of the modeled Spokane median against the U.S. median for this scope. · City of Spokane building department, Hometriva methodology
Spokane vs Washington vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated basement waterproofing in Spokane
$8,905
Likely range $3,405 – $19,205
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Interior drain tile versus exterior excavation and membrane
- Linear feet of wall treated and the number of sump pits
- Concrete breakout and replacement inside the slab
- Battery backup or a second pump for redundancy
- Grading, downspout extension and window well work outside
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Spokane building departmentModeled estimate |
| electrical | City of Spokane building departmentModeled estimate |
| mechanical | City of Spokane building departmentModeled estimate |
| plumbing | City of Spokane building departmentModeled estimate |
| zoning | City of Spokane building departmentModeled estimate |
| fire | City of Spokane building departmentModeled estimate |
Permit requirement in Spokane
It depends on scope. Like-for-like cosmetic work in Spokane is often exempt, but a permit is required as soon as you change structure, plumbing, electrical or the building envelope.
- Permitting authority
- City of Spokane building departmentModeled estimate
- Permit fee
- Estimated allowance $0–$410Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Plumbing inspection where a sump discharge is added
Local conditions that change this job
Only the exposures that materially affect basement waterproofing.
Cooling load / heat exposure
High62/100
Humidity
Low26/100
Named-storm exposure
Moderate42/100
Nearby market comparison
| Market | Local factor | Median | Per linear foot of drain installed |
|---|---|---|---|
| Spokane (this page) | x1.056 | $8,700 | $50 – $150 |
| Coeur d'Alene | x0.938 | $7,700 | $50 – $150 |
What Spokane homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in Spokane
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Spokane waterproofing costs
Hometriva does not publish invented city prices. The Spokane estimate for basement waterproofing is produced by this chain, and every input is stored separately:
- National baseline$8,200
Typical U.S. cost for basement waterproofing on a single-family home.
- Local labor factorx1.065
Spokane-area trade labor rates, weighted at 55% of this job.
- Material factorx1.028
Material and delivery pricing into Spokane County, weighted at 45%.
- Regulatory factorx1.037
Local code, product-approval and inspection load, applied at 20% for this project type.
- Applied multiplierx1.056
Blended Spokane adjustment specific to basement waterproofing.
- Permit component$0 – $410
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, basement waterproofing in Spokane carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for basement waterproofing pricing in Spokane, WA.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Is a permit needed to waterproof a basement?
Interior drainage is often treated as maintenance, but adding a sump discharge, altering plumbing or excavating against the foundation usually triggers a permit. Ask the local building department before work starts.
Does interior drainage fix the cause?
It manages water that has already reached the wall. When the cause is grading, gutters or a downspout discharging beside the foundation, correcting that outside is cheaper and should come first.
How long does basement waterproofing take?
2-5 days of work. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are interior drain tile versus exterior excavation and membrane; linear feet of wall treated and the number of sump pits; concrete breakout and replacement inside the slab.
Sources
Sources & verification
- City of Spokane building department
- Spokane permit portal
- Washington State Building Code Council
- BLS Occupational Employment and Wage Statistics
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.