Basement walkout construction, drained properly.
Engineered walkouts that add light, access and value, with drainage designed in so the new door never becomes a new leak.
Signs a walkout makes sense for your home
- Sloped lot with a buried basement wall
- Basement apartment that needs its own entrance
- Want direct backyard access from the lower level
- The basement feels like a cave
Walkout or walk-up: which fits your lot?
A true walkout needs a lot that slopes away from the house, so part of the basement wall is already above grade. We cut a new opening in that wall and you step straight out at yard level. On a flatter lot, the answer is a walk-up: we excavate a stairwell down to basement level, build retaining walls and stairs, and put a door in at the bottom.
| Type | Best for | What gets built | Typical cost |
|---|---|---|---|
| Walk-up entrance | Flat or gently sloped lots, separate entrances for a basement unit | Excavated stairwell, retaining walls, stairs, drain, new opening and door | $15,000 to $30,000 |
| Full walkout | Lots that slope away from the house | New opening at grade, retaining walls, landing, drainage and door | $25,000 to $50,000 |
Typical Hamilton-area ranges before tax. Deep excavation, long retaining walls and premium doors push the price up.
Permits and drawings for a walkout
Cutting a new opening in a foundation wall is structural work, so expect a building permit and engineered drawings for the opening and any retaining walls. Municipalities around Hamilton say so directly: Oakville lists below-grade entrances and walkouts as permit work, Milton requires a permit for new exterior openings with a wall section showing drainage and flashing, and Haldimand lists creating or enlarging a below-grade entrance.
Stamped drawings typically run $1,500 to $5,000, and we coordinate them and the permit as part of the job. Lots near creeks or the escarpment can also need conservation authority approval, which we check before we design anything.
The drain at the bottom matters most
Every walk-up collects rain and snowmelt at the bottom of the stairs. If that water has nowhere to go, the new door becomes a new leak. We design the drain, the slope of the landing and the waterproofing on the new walls together, and send the drain to a storm connection, a dry well or a sump that discharges to one. Under the 2024 Building Code, a stairwell drain carries storm water, so it can't go into the weeping tile.
In Halton, a below-grade walkout drain that's connected to the sewer can be disconnected under the Region's flood subsidy, which covers that work at 100% up to $6,500. See our guide to basement flooding subsidies for the details.
What actually happens
- 01
Design & permit
Structural drawings for the new opening and retaining walls, plus the permit.
- 02
Excavate & retain
Excavation, retaining walls, stairs and a drain at the bottom so water has somewhere to go.
- 03
Cut, frame, finish
Wall opening with a proper lintel, door installed, exterior finished and waterproofed.
Priced in writing, after we've seen it.
What moves the price
- Depth of excavation and size of retaining walls
- Door and lintel size
- Finishes: stairs, railings, landscaping
How we quote
Typical market ranges
$15,000 to $30,000 for a walk-up entrance
$25,000 to $50,000 for a full walkout on a sloped lot
Hamilton area, 2026, before tax. Your written quote is based on your home.
A walkout is a structural job with a lot of variables, which is why we quote it only after seeing the grade. Written, fixed, with finishes itemized.
Guides for this job
Three reasons homeowners pick us for this
- Structural and waterproofing under one roof
- Drainage designed in from the start
- Written warranty
Asked about walkout basements
Does a walkout need a permit?
Can it be done on a flat lot?
How long does it take?
Often done together
Cracks don't fix themselves. Let's look before it costs more.
A free, no-pressure assessment from the people who'll actually do the work.