2026 price ranges for planning a Madison job
These are national figures from cost guides, not quotes. We don't set prices. A Dane County contractor may come in higher or lower once they see the basement and find the cause.
| Job | Published figure | From |
|---|---|---|
| Whole-basement waterproofing | About $5,247 on average; typical span $2,461 to $8,207. A small crack can start near $600, and a full system can reach about $15,000. | Angi |
| Inside vs. outside | Inside work averages about $3,000; outside, with digging, about $7,000 | Angi |
| Drain tile under the slab edge | $40 to $85 a linear foot. Roughly $4,000 to $8,500 for 100 feet with one pump; $8,000 to $12,000 for 200 feet | HomeGuide |
| French drain or weeping tile inside | $60 to $120 a linear foot | Angi |
| Footing drain from outside | $1,500 to $4,000 per side; $6,000 to $15,000 total | HomeGuide |
| Sump pump | About $1,100 on average; usually $800 to $1,500. Battery backup: $1,000 to $2,000 more | Angi |
| Epoxy crack injection | $800 to $1,500 a crack | Angi |
| Bowing wall | About $4,500 on average; $500 to $10,000. Engineer's report $250 to $500 | Angi |
| Window well drain; full egress window | $1,000 to $2,500; $2,500 to $6,500 | HomeGuide |
| Regrading; buried downspout | $500 to $3,000; $150 to $350 each | HomeGuide |
| Crawl space liner and sealing | $3,000 to $15,000, or $3 to $10 a sq ft | HomeGuide |
| Permit, if needed | $75 to $500 or more | Angi |
Sources: Angi, "How Much Does Basement Waterproofing Cost? [2026 Data]" (updated Oct 16, 2026); Angi, "How Much Does It Cost to Install a Sump Pump? [2026 Data]" (updated Oct 5, 2026); Angi, "How Much Does Bowing Basement Wall Repair Cost? [2026 Data]" (updated Oct 1, 2026); HomeGuide, "How Much Does a Drainage System Cost? (2026)" (Feb 6, 2026).
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Why Madison bids vary
- What's actually wrong. A crack, a high water table and a bad downspout lead to very different fixes (Angi; HomeGuide).
- Feet of wall. Drain tile is sold by the linear foot, so a bigger footprint costs more (HomeGuide).
- Block or poured walls. Angi says poured concrete is usually cheaper to waterproof than block.
- House age. Older homes often cost more, Angi notes, because of older building methods and worn materials.
- Getting to the wall. Clay soil and tight side yards add digging labor (Angi).
- Finished space. Drywall, carpet and storage have to come out first; Angi puts prep at $200 to $1,000 if the crew does it.
- The discharge run. In Madison, a run to the storm sewer is the best option but also the most expensive, per City Engineering, because it needs pipe, a connection and a right-of-way permit.
Madison rules that affect the price
City of Madison Engineering says many older areas of Madison were built on "made land." These are old wetlands or low areas that were filled so homes could be built. Average yearly rain and snow has risen about 3 inches over the last 20 years, per the city. In many of those areas the groundwater table now reaches basements, and some sump pumps run around the clock. (Source: City of Madison Engineering, Sump Pumps.)
Where a Madison sump pump can discharge. City Engineering says sump discharge to the sanitary sewer, such as a basement floor drain, isn't allowed. Its listed options are discharging onto the property, directly to a storm sewer if one is available (typically within 100 feet), to the curb, or to an infiltration bed. A pump that runs often should go to the storm sewer if at all possible, which reduces algae in summer and ice in winter (City of Madison Engineering, Sump Pumps).
Connecting to the storm sewer. Sump pumps, downspouts and yard drains may discharge to a nearby City storm sewer, but an Excavation in the Right-of-Way Permit is required before any connection (City of Madison Engineering, How to Use the Sewer). The city notes the contractor must be qualified to work in the right-of-way (City of Madison Engineering, Sump Pumps).
Permits. For one- and two-family homes, Madison lets contractors and owner-occupants apply online for a building repair or replace permit to install basement drainage systems without structural repairs. Work that changes framing or adds structural reinforcement needs plan review (City of Madison Development Services Center, Online permits).
Digging outside means calling Diggers Hotline (811) at least three working days ahead.
Local sources: City of Madison Engineering, Sump Pumps; City of Madison Engineering, How to Use the Sewer; City of Madison Development Services Center, Online permits.
Checking a bid
- Does it say where the water enters, and does the method match?
- Does it list feet of drain tile, the pump model, any backup, and exactly where the discharge ends up?
- Is the warranty written down, and does it transfer to a buyer?
- Who applies for the permit?
- Have you checked insurance and reviews yourself, and seen at least one other bid for a big job?
Services
Madison basement cost questions
Are these Madison prices?
No. They are national figures published by Angi and HomeGuide in 2026. This site does not set or quote prices; a contractor prices your basement after a visit.
Why are my two bids so far apart?
The contractors probably see different problems. Injecting one crack, adding drain tile and a pump, and digging outside are three different jobs. Ask each one to show you where the water enters.
Is there a cheap fix to try first?
Often outside. HomeGuide puts regrading at $500 to $3,000 and a buried downspout line at $150 to $350 each. In Madison, a sump hose that ends on the lawn can send water right back in.
Will insurance cover it?
Usually not. HomeGuide says standard homeowners policies don't cover flooding or outside groundwater. Sump failure and sewer backup coverage are separate add-ons to ask your agent about.
Do I need a permit?
Often. Angi notes permits ($75 to $500 or more) are often triggered by excavation or structural repairs. In Madison, installing a basement drainage system without structural repairs falls under a building repair or replace permit that can be applied for online. Ask your contractor who pulls it.
Can a Madison sump pump drain to the storm sewer or curb?
Not into the sanitary sewer or a basement floor drain. City Engineering lists the property, a nearby storm sewer, the curb or an infiltration bed as options, and a storm sewer connection needs an Excavation in the Right-of-Way Permit. Check with City Engineering before you install.