Drainage excavation collects water that is causing damage and gives it a controlled path to a ditch, a storm system, a rock pit or daylight. In the Fraser Valley, small fixes like a downspout run to daylight or a short French drain often land between $1,500 and $5,000, while full perimeter drain replacement on an existing home commonly runs $8,000 to $20,000.
Why Is Drainage the Defining Earthwork Here?
Because the valley floor is slow-draining silt and clay, the rain arrives in long wet-season sieges, and in low areas the winter water table sits near the surface.
Drainage excavation collects water that is causing damage and gives it a controlled path to somewhere harmless: a ditch, a storm system, a rock pit or daylight on a lower slope. In the Fraser Valley this is not a luxury trade. The valley floor is silt and clay that drains slowly, the rain arrives in long wet-season sieges, and the winter water table in low areas sits near the surface. Almost every property here eventually has a water problem, and almost every water problem is fixable with the right combination of grading, pipe and gravel.
We build and repair drainage for homes, acreages and farms: foundation perimeter drains, French drains across soggy yards, field ditching, culverts under driveways and crossings, downspout and sump discharge runs, and the regrading that stops water from arriving in the wrong place to begin with.
When Should a Drainage Problem Be Diagnosed?
In the rain. Winter is the one season that makes drainage diagnosis honest, because the water is on the ground showing you its actual path.
Drainage is the one branch of excavation where winter is an advantage. From October to March the water is on the ground showing you its path: where it enters the property, where it ponds, where it sneaks toward the foundation. We often walk properties in the rain precisely because it makes the diagnosis honest. Construction itself is flexible: small runs can be built year-round, while big regrading jobs are better in shoulder seasons when the ground carries a machine without rutting.
What Kinds of Drainage Do We Build?
Six systems cover almost every Fraser Valley water problem, and the cheapest one on the list, regrading, solves more of them than most owners expect.
- Perimeter (footing) drains: excavate to the footing, install perforated PVC wrapped in filter cloth with clean drain rock, and backfill free-draining, for basements and crawlspaces that stay dry
- French drains: gravel-and-pipe interceptor trenches that cut off groundwater moving across a yard, paddock or hillside seep line
- Ditching: new ditches cut to grade, and old farm ditches cleaned, deepened and pulled back to working shape
- Culverts: sized, bedded and set at correct grade under driveways, gateways and field crossings
- Downspout and sump runs: solid pipe carrying roof and pump water well away from the building
- Regrading and swales: reshaping ground so water sheds away from structures and collects where you want it, which is often the cheapest fix on the list
How Is Farm and Acreage Drainage Different?
It works at field scale and depends on ditch networks rather than pipe around a building. Maintenance, not construction, is usually the fix.
Field drainage is its own discipline. On the dairy and berry flats around Chilliwack, Sumas Prairie and Matsqui, working fields depend on ditch networks that need regular cleaning and the occasional rebuild. On hobby farms and horse properties in Langley and Aldergrove, the usual complaints are flooded paddocks, mud around gates and waterers, and driveways that turn into creeks. Typical fixes: crown and regrade high-traffic areas, intercept upslope water with a French drain, restore the ditches that a decade of neglect has filled in, and put properly bedded culverts under every crossing. We schedule around livestock and growing seasons because farm work does not pause for contractors.
What Are the Rules Near Ditches and Watercourses?
Stricter than most owners expect. Roadside ditches sit in the municipal road allowance, and many ordinary-looking Fraser Valley ditches count as fish-bearing watercourses.
Not every wet channel is yours to dig. Roadside ditches usually sit in the municipal road allowance and need approval to alter. Watercourses that support fish, and in the Fraser Valley many innocent-looking ditches do, are protected by provincial riparian rules and federal fisheries law, with setbacks and timing windows for any work. And directing your water onto a neighbour's land is a fast route to a legal dispute. We identify which category each channel on your property falls into and keep the work on the right side of every line. It is far cheaper to route a drain correctly the first time than to remediate a protected watercourse.
When Do Older Homes Need New Perimeter Drains?
When the original pipe is crushed, root-bound or gone, which is common on valley homes built between the 1960s and the 1980s.
Fraser Valley homes from the 1960s through 1980s often have original perimeter drains that are crushed, root-bound or simply gone. The symptoms are familiar: damp basement corners every January, efflorescence on the foundation, water in the crawlspace. The durable fix is excavation: dig to the footing, replace with new perforated pipe, filter cloth and clean rock, damp-proof while the wall is exposed, and backfill with material that drains. We coordinate with camera inspection companies, work in sections to keep the site safe, and restore grades when the pipe is in. Paired with downspout rerouting, it usually ends the problem permanently.
How Is Drainage Work Priced?
From the actual problem, after a site walk, as a firm price. Typical Fraser Valley ranges:
| Job | Typical cost | What moves the number |
|---|---|---|
| Downspout run to daylight | $1,500 to $5,000 | Length, surfaces crossed, outlet distance |
| Short French drain | $1,500 to $5,000 | Depth, rock volume, where the water can go |
| Regrading or a swale | Often the cheapest real fix | Area regraded, material imported |
| Ditch cleaning and culvert reset | Quoted per run | Length, spoil disposal, culvert size |
| Full perimeter drain replacement | $8,000 to $20,000 | Depth to footing, access, landscaping to restore |
Drainage quotes built from a phone call are guesses. We walk the property, ideally when it is wet, find where the water comes from and where it can legally go, and quote a firm price for a system that solves the cause rather than the symptom. If the honest answer is a $1,800 regrade instead of a $12,000 pipe network, that is the answer you will get.
Frequently Asked Questions
How much does drainage work cost in the Fraser Valley?
Small drainage fixes like a downspout run to daylight or a short French drain often land between $1,500 and $5,000, while full perimeter drain replacements on an existing home commonly run $8,000 to $20,000 or more depending on depth, access and landscaping restoration. Farm ditching and culvert work is usually priced hourly plus materials. Every drainage quote we give is firm and based on walking the property, ideally while it is actually wet.
Why is my Fraser Valley yard so wet every winter?
Because the valley combines heavy October-to-March rainfall with silt and clay soils that drain slowly, and in low-lying areas a winter water table that sits close to the surface. Water that cannot soak in must be collected and moved, which is what ditches, French drains and culverts do. The wet season is actually the best time to diagnose the problem, because the water shows you exactly where it wants to go.
What is the difference between a French drain and a perimeter drain?
A perimeter drain (footing drain) is perforated pipe installed around a building foundation at footing level to keep water away from the basement or crawlspace, while a French drain is the same idea applied anywhere in the landscape: a gravel-filled trench with perforated pipe that intercepts and redirects groundwater. Both only work if they have somewhere to discharge, a lower point of daylight, a storm connection, a ditch or a properly built rock pit.
Can you fix standing water in my horse paddock or field?
Yes, that is classic Fraser Valley farm work: regrading so water sheds instead of ponding, cutting or restoring ditches, installing French drains across seepage lines, and placing culverts where crossings block flow. On working farms we sequence around animals and seasons, and we are realistic about what a high winter water table will and will not allow. Often the win is moving water off the high-use areas fast rather than trying to dry an entire field.
Do I need a permit for drainage work?
Sometimes. Connecting to municipal storm systems requires a permit, work on roadside ditches usually needs municipal approval since the ditch is typically in the road allowance, and anything touching a fish-bearing watercourse triggers provincial and federal protections. Moving water onto a neighbour is never allowed. Part of our job is knowing which of these applies to your property before the digging starts.
When should perimeter drains be replaced?
If your basement gets damp every winter, if the drains are original clay or no-corrugation pipe from before the 1980s, or if a camera inspection shows crushed or root-filled sections, replacement is usually smarter than repeated flushing. Excavating to the footing, installing new perforated PVC with filter cloth and clean drain rock, and backfilling with free-draining material solves it once. We do this work in coordination with drainage camera companies and can quote from their video.