Two perimeter drain quotes on the same Fraser Valley house can sit $10,000 apart because they are pricing different scopes, not because one contractor is greedy. Full replacement runs $15,000 to $30,000 here. The gap usually hides in trench depth, restoration, disposal, the discharge solution and whether foundation waterproofing is included. Prices are indicative market estimates for August 2026.
Here is how to line three quotes up so they are actually comparable, including the municipal fees that rarely appear in anyone’s first number.
What are you actually comparing?
Not a price for a product. You are comparing scopes of excavation work, and the pipe is the cheapest part of all of them.
| Scope item | What a complete quote states | Why it moves the price |
|---|---|---|
| Camera evidence | The findings the quote is based on, with footage you keep | Decides whether replacement is needed at all |
| Trench depth and length | Depth to the footing, metres of run, sides included | Full basement depth can be roughly two metres |
| Pipe and bedding | Rigid perforated PVC, washed drain rock, filter fabric, cleanouts | Cheap bedding silts up and shortens system life |
| Discharge | Storm connection, daylight outlet or sump, and who gets the permit | A sump adds $2,500 to $6,000 |
| Waterproofing | Membrane and dimple board on the exposed wall, or explicitly excluded | Adds $3,000 to $8,000 while the trench is open |
| Disposal | Spoil, old pipe and broken concrete hauled away | Bin and tipping costs are real money |
| Restoration | Concrete, decks, patios, sod and planting put back | The most commonly excluded item |
| Change conditions | What happens if the ground differs from the plan | Decides who absorbs surprises |
Print that list and hand it to every bidder. Most of the spread between quotes lives in the last four rows.
Why does the same house get quotes thousands apart?
Because the underground conditions are genuinely unknown until someone looks, so each contractor is pricing their own assumption. Ours is a region that tests those assumptions hard: Environment and Climate Change Canada’s climate normals put Abbotsford at 1,504.6 mm of precipitation a year, with 233.1 mm arriving in November alone, so a system installed to the cheaper assumption gets found out in its first winter.
The assumptions that vary most:
- Depth. A crawlspace footing and a full height basement are different excavations at the same street address.
- Access. Machine access down both sides versus hand digging past a gas line changes labour dramatically.
- Surfaces. Cutting and replacing a concrete driveway or a patio can add more than the pipe work.
- Discharge. An existing storm connection at the right elevation is the cheap case. A new connection or a pump is not.
- Scope of the loop. Some quotes cover the full perimeter, some cover the two failed sides.
- Extras assumed in or out. Waterproofing, downspout re-piping and window well drains are common swing items.
Our breakdown of what perimeter drain replacement costs in BC covers where a number lands inside the range, and flushing versus replacement covers the cheaper branch that a camera sometimes opens up.
What do city permits and connection fees add?
Less than most people fear, but the rules differ enough between valley municipalities that they can change the design of the job. All four of these come from the municipalities’ own published documents, and they change, so confirm before you sign.
| Municipality | What the process looks like | Published detail |
|---|---|---|
| Chilliwack | Service Connection Permit required before any storm drain is connected | $40 permit fee and $40 inspection fee, plus a $1,400 connection charge for a 100 mm or 150 mm service where the City constructs it, with larger sizes at actual cost |
| Township of Langley | The Township installs the service to the property line at cost, gravity flow only | A non-refundable estimate fee is due at application and the written estimate is valid for 90 days |
| Abbotsford | Infiltration first, assessed by a Qualified Professional | An existing storm connection cannot be reused on a rebuild unless the QP shows the property cannot infiltrate, and on-site systems are designed for a 1 in 100 year event |
| Mission | Separate storm system of roughly 100 km of mains and 140 km of roadside ditches | The City says drainage backups are usually “within your property” and that staff will not investigate or correct problems on private property |
The Chilliwack and Langley rules point in opposite directions on one question that decides whether you need a sump. Chilliwack’s Storm Sewer System Connection and Regulation Bylaw No. 2231 allows an owner whose storm drain sits at the wrong elevation to install and maintain a pumping system at their own expense, subject to the Engineer’s approval. The Township of Langley’s stormwater service connection permit sheet says the opposite for existing homes: if your building cannot provide gravity flow to the stormwater system, “you will not be permitted to connect via a pumped system.” Same problem, two different answers, and a quote written for the wrong city gets rejected at the counter.
Abbotsford adds a professional report to the front of the job in many cases. The City’s stormwater guidance requires a Qualified Professional to run a percolation test and issue a signed and sealed report before an existing storm connection can be reused on a rebuild, and it puts ongoing maintenance of any on-site system on the owner.
What should the written quote actually say?
If a quote fits on a business card, it is not a quote. Ask for these in writing before you compare anything:
- The camera findings the price is based on, and confirmation you receive the footage
- Trench length, depth and which sides of the house are included
- Pipe type, drain rock, filter fabric and cleanouts as named inclusions
- The discharge method, and who obtains and pays for any municipal connection permit
- Whether foundation waterproofing is included, excluded, or offered as a priced option
- Disposal and haul away, stated explicitly
- Exactly what gets restored, to what standard, and what does not
- What happens if conditions underground differ from the assumption, and how that is priced
- Payment milestones tied to stages of work
How do you check the contractor, not just the number?
Two free checks and one clause do most of the work.
First, ask for a WorkSafeBC clearance letter naming you and covering the full period of the contract. WorkSafeBC’s own guidance on why you need a clearance letter explains that a homeowner who hires a contractor that is not registered, or not current on premiums, can be liable for the premiums owed on work done on their behalf. The letter costs nothing.
Second, know the holdback. BC’s Builders Lien Act requires the person primarily liable on a contract to retain a holdback equal to 10 percent of the greater of the value of the work actually provided and the amount paid on account of the contract price, and the holdback period runs 55 days from completion. Raising it early tells a contractor you are an informed client and gives you a lawful cushion if a subcontractor goes unpaid.
Third, insist on the change conditions clause. Excavation always has the potential for surprises, and the difference between a good contractor and a bad invoice is whether that possibility was written down before the machine arrived. Older properties carry more of these, which is why we wrote up the hidden costs on a pre-1990 home separately.
The short version
Quotes differ because scopes differ. Get independent camera evidence first, write one scope, send that same scope to every bidder, and confirm the discharge rules for your specific municipality before anyone prices a connection. Then the cheapest number is genuinely useful information rather than a guess about what got left out.
Comparing quotes right now? Call (604) 800-7217 for a second opinion, or start with a drain camera inspection so every quote you collect prices the same verified problem. See what perimeter drain replacement involves across Abbotsford, Chilliwack, Mission and Langley.
Frequently Asked Questions
Why is one perimeter drain quote half the price of another?
Almost always because it covers less. The common exclusions are restoration of concrete and landscaping, disposal and haul away, the discharge solution, and any waterproofing of the exposed wall. A quote can also be lower because the contractor assumed a shallower trench or an easier access route. Ask each bidder to price the same written scope and the spread usually collapses to a few thousand dollars.
Should I get three quotes for perimeter drain replacement?
Two or three is sensible, but only if they are pricing the same documented problem. Independent camera footage is what makes that possible, because every bidder is then quoting the same verified condition instead of their own guess. Without it you are comparing three different opinions about what is underground, which is not a price comparison at all.
Do I need a permit to replace my perimeter drains?
Replacing pipe entirely on your own property is treated differently from connecting to the municipal storm system, and the connection is where permits live. Chilliwack requires a Service Connection Permit before any storm drain is connected, and the Township of Langley issues a stormwater service connection permit and does the work to the property line at cost. Confirm your specific job with your city's engineering desk before work starts.
How much deposit should a drainage contractor ask for?
There is no fixed rule in BC, but a large up-front cash payment before any work or materials arrive is a warning sign. It is more useful to focus on the written scope, the change conditions clause and the payment milestones tied to stages of work. BC's Builders Lien Act also requires the person primarily liable on a contract to retain a 10 percent holdback, which is worth raising before you sign.
What is a WorkSafeBC clearance letter and why should I ask for one?
It confirms whether the business you are hiring is registered with WorkSafeBC and current on its premiums. WorkSafeBC warns that a homeowner who hires an unregistered or delinquent contractor can be liable for premiums owed in connection with the work. The letter is free, you can request it yourself, and it should name you and cover the whole period of your contract.
Is the cheapest quote ever the right one?
Yes, when it is the cheapest quote for the correct job. That happens more often than people expect, because camera evidence sometimes shows the line is intact and merely silted, in which case flushing at $600 to $1,500 beats every replacement quote on the table. The trap is a cheap quote for the wrong scope, not a cheap number.
Published August 20, 2026 · Last updated August 20, 2026 · Fraser Valley Drainage