Delta, BC repair guide
Drainage and Foundation Repair in Delta: Ladner and Tsawwassen on the Silt, North Delta on the Hill
Delta is really two places with a farm between them. Ladner and Tsawwassen are on the Fraser delta and the Boundary Bay flats, a metre or two above the sea behind dikes, on silt that settles under every house; basements are rare, crawlspaces are the norm and staying dry is a permanent project. North Delta is on the upland, with 1960s and 70s houses that have basements, rented suites and the ordinary problems of groundwater and old perimeter drains. This guide covers what fails in each, what the City maintains and what is yours, and what to ask a contractor.
By Michael, founder, fixmystuff.ca · Reviewed and updated 2026-09-11 · About 7–10 minutes
Ladner and Tsawwassen: the delta
The silt under Ladner compresses under weight, so houses settle, and a heavy addition or a garage slab on fill settles unevenly. The signs are doors and windows that stick, diagonal cracks from window corners, steps that no longer meet the porch. Tsawwassen sits on slightly firmer ground on the bluff but its lower streets share the problem. The water table is close to the surface year-round and rises in the winter rains; crawlspaces flood or stay damp, and perimeter drains silt up over the decades.
Some settlement is expected in the first years. Movement that keeps going, or that opens cracks wider than a coin, needs a geotechnical engineer’s opinion before a foundation contractor quotes underpinning or piles.
| What you see | Likely cause | Who fixes it |
|---|---|---|
| Damp or standing water in a Ladner crawlspace | High water table, failed perimeter drain | Drainage contractor |
| Doors sticking, diagonal cracks | Uneven settlement | Geotechnical engineer, then foundation contractor |
| Yard stays flooded after rain | Flat lot, blocked ditch or culvert | Landscaper or City, depending on where the water sits |
| North Delta basement wet at the wall-floor joint | Groundwater, silted perimeter drains | Drainage contractor |
What the City owns and what you own
The City of Delta owns and maintains the dikes along the Fraser and Boundary Bay, the pump stations, and the network of ditches, culverts and storm sewers that drain Ladner, Tsawwassen and the farmland between them. If a roadside ditch or a culvert under your driveway is blocked and flooding your frontage, report it to the City. Everything inside your property line is yours: perimeter drains, sump, crawlspace and grading. Many Ladner lots are flat and drain nowhere, so a sump and pump to the street or a ditch is often the answer.
Delta publishes flood-construction levels for new building on the lowlands; additions and renovations may need to meet them, and excavation near a dike or ditch needs the City’s approval.
Fixing a wet crawlspace or basement
A crawlspace on delta ground needs perimeter drainage that works, a sump where the lot cannot drain by gravity, and a sealed vapour barrier over the soil so ground moisture does not condense on the joists; a dehumidifier alone treats the symptom. A North Delta basement needs the ordinary fixes: a camera inspection of the perimeter drains, flushing or replacement of silted sections, a sump pump with a battery backup, and downspouts extended well away from the foundation. In either case, mould in the joists and rot in the sill plate are the costs of waiting.
If the house has a rented suite in the basement, BC’s tenancy rules make the landlord responsible for keeping it dry and habitable; report water to the landlord in writing.
- Photos of where the water stands, inside and out
- Age of the house and whether perimeter drains exist
- Crack widths and whether they are growing
- Roadside ditch and culvert condition
- City drainage map for your street, if flooding starts at the road
Hiring a contractor
Drainage and foundation work is unlicensed in BC. Ask for a certificate of liability insurance and a WorkSafeBC clearance letter, and for foundation work, ask whether the design comes from an engineer. A drainage quote should state what was inspected by camera, what is being replaced, where the water will be discharged and the warranty. A quote for piling or underpinning should come with the geotechnical report it is based on. Consumer Protection BC publishes guidance on contractor contracts and deposits.
Questions to ask before booking
- Will you camera the perimeter drains before quoting?
- Where will the water be discharged, and does that need City approval?
- For settlement: is the quote based on a geotechnical report?
- Can I see your liability certificate and WorkSafeBC clearance?
- What is the warranty on the drainage work and the pump?
Frequently asked questions
Why do Ladner houses have no basements?
The water table on the delta sits about a metre down, so basements would flood. Homes are built on slabs or over crawlspaces, and keeping the crawlspace dry is the equivalent problem.
Who maintains the dikes in Delta?
The City of Delta maintains the dikes, pump stations, ditches and storm sewers. Your perimeter drains, sump, crawlspace and grading are yours.
Is settlement normal in Tsawwassen and Ladner?
Some is. Delta silt compresses under a house for years. Uneven settlement that keeps opening cracks needs a geotechnical opinion before anyone sells you piles.
My North Delta basement suite is wet. Who fixes it?
The landlord, under BC’s tenancy rules, if you rent. Report it in writing. The usual fix is camera inspection and repair of the perimeter drains and a sump with a battery backup.
Nearby communities
Drainage contractors who work Ladner and Tsawwassen also cover Richmond, which sits on the same silt behind its own dikes. North Delta shares its contractors with Surrey.
Browsing more broadly? Start from the Delta repair hub for every local guide in one place.
Sources and further reading
- City of Delta: flood protection and drainageDikes, pump stations, ditches and flood-construction levels.
- City of Delta: building permitsPermits for additions and foundation work.
- WorkSafeBC: clearance lettersConfirming a contractor’s coverage.
- Consumer Protection BCContracts, deposits and cancellation rights.
Prices, programs, and acceptance rules can change. Check each source and obtain a written local quote before deciding.