Hamilton drainage problems come in two flavours. Below the escarpment, heavy clay over shale holds water and lots back onto each other. On the Mountain, the Haldimand clay plain is so flat that water has nowhere to go. Either way the fix starts with where the water comes from and where it is legally allowed to end up. Here is what it costs and what the City requires.
2026 drainage costs in Hamilton
| Fix | 2026 cost | Best for |
|---|---|---|
| Buried downspout extension | $380 - $1,300 | Water pooling at the corners of the house |
| Regrading so the ground slopes away | $1,600 - $6,500 | Soil that slopes back toward the walls |
| Swale | $1,400 - $5,200 | Moving surface water across the lot |
| French drain, typical 40 ft run | $2,600 - $5,400 | A side yard or lawn that stays soaked |
| Catch basin and connection | $850 - $2,400 | A low spot that ponds after every rain |
| Dry well | $1,900 - $5,800 | Nowhere legal to send the water |
| Sump pump, pit and discharge line | $1,900 - $4,800 | Water below grade, high water table |
| Several fixes together | $6,000 - $26,000 | Lots with more than one problem |
Most of the calls we get in Hamilton are solved at the cheap end: downspouts dumping at the wall, and soil that has settled back toward the foundation. The expensive jobs are basements taking water at the floor joint, which means below-grade water and usually a sump system or new weeping tile. Our drainage cost guide breaks every option down.
Hamilton's downspout and sump pump rules
Hamilton's Sewer and Drain By-law 23-234, in force since late 2023, sets out where roof and foundation water can go:
- Downspouts must be disconnected from the sewer, capped at grade, and discharge onto a splash pad at least 0.6 m from the exterior walls.
- No harm next door. A downspout cannot cause damage or any adverse effect on an adjacent property, and none can connect to the foundation drain.
- Sump pumps can discharge to the storm sewer, to the ground surface if it does not leave the ground continually wet or affect neighbours, sidewalks or roads, or to a dry well once soil and groundwater testing show it will work. Foundation drains can never go to the sanitary sewer.
- Property standards separately ban sump discharge onto a neighbour's land, a sidewalk, the road allowance or stairs.
Fines under the sewer by-law run $50 to $50,000 for a first offence. The City's own guidance adds that the ground should slope away from the house for at least the first metre.
The $2,000 Protective Plumbing Program
For homes built before January 1, 2012, the City's Protective Plumbing Program (3P) offers up to $2,000 toward flood protection: a backwater valve with an assessment, a sump pump installed with a backwater valve, and downspout disconnection at $75 per downspout. Using one of the City's pre-qualified contractors matters, because the backwater valve grant drops to $500 otherwise. A separate loan of up to $2,000 at 4% may be available. Check that the program is taking applications before you book.
Grading, fill and your neighbours
If your home was built in a subdivision, the City approved a lot grading plan for it, and you are expected to keep it: do not fill in the swales along the side and rear lot lines or block a rear-yard catch basin, even if they are wet. Under the Site Alteration By-law (19-286), ordinary landscaping needs no permit only if fill stays at 15 cm or less, nothing changes the location, direction or rate of drainage to the neighbours, and no swale is altered. Anything beyond that needs a site alteration permit, which takes 4 to 6 weeks and a security deposit. Near a creek, valley or the escarpment, check whether you are in a Hamilton Conservation Authority regulated area as well.
Every drainage job involves digging, so book a free utility locate through Ontario Dig Authority at least 5 business days ahead.
The stormwater fee is coming
Hamilton will start a stormwater fee in 2028, estimated at about $200 a year for a detached home. Houses do not get credits against it, but the Rain Ready Rebate pays up to $1,500, or $5,000 on the larger tier, for new projects like rain gardens and permeable surfaces that keep water on your lot.
Where we work in Hamilton
Lower city, the Mountain, Stoney Creek, Ancaster, Dundas, Waterdown and Binbrook. We start with a site visit in the rain if we can, because that is when the problem shows itself.
Frequently asked questions
How much does yard drainage cost in Hamilton?
From $380 to $1,300 for buried downspout extensions, $1,600 to $6,500 for regrading, $2,600 to $5,400 for a 40 ft French drain and $6,000 to $26,000 for a lot that needs several fixes.
Do I have to disconnect my downspouts in Hamilton?
Yes. Sewer and Drain By-law 23-234 requires disconnection, with discharge onto a splash pad at least 0.6 m from the house and no harm to neighbouring properties.
Where can my sump pump drain in Hamilton?
To the storm sewer, to the ground if it does not create continually wet ground or affect neighbours, sidewalks or roads, or to a dry well after soil testing. Never to the sanitary sewer.
Is there a grant for drainage work in Hamilton?
The Protective Plumbing Program offers up to $2,000 for homes built before 2012, covering a backwater valve, a sump pump with a backwater valve, and $75 per downspout disconnected.
Do I need a permit to regrade my yard in Hamilton?
Not for landscaping with 15 cm of fill or less that does not change drainage to neighbours or alter a swale. Beyond that, a site alteration permit is required.
Can I fill in the swale behind my house?
No. Swales and rear-yard catch basins are part of the approved lot grading and must be kept open.