Rainwater management means controlling where rain lands, how fast it moves, and where it ends up — protecting the home, the site, and the storm system. On the steep, high-rainfall North Shore, it's increasingly required by local stormwater rules — not just a nice-to-have.
On the North Shore, rain isn't an occasional event — it's the defining condition of the site. Steep terrain, heavy annual rainfall, dense tree canopy, and a lot of older housing stock add up to one of the most water-aggressive building environments in the country. Managing that water well is one of the highest-leverage things you can do to protect a home and the ground it sits on. It's also one of the most commonly overlooked, because most of the system is invisible until something goes wrong.
How is rainwater management different from drainage?
People use the words interchangeably, but they're not the same. Drainage is reactive — it deals with water that's already pooling, flooding, or finding its way somewhere it shouldn't. Rainwater management is the bigger picture: deciding where water lands, how fast it moves, where it goes, and what it does to the building and the landscape along the way. Good drainage is one part of it. So are roof design, grading, soil, hardscape, and — where it makes sense — capturing water to use rather than just shedding it.
If you're already seeing pooling, damp, or movement, start with our companion piece on drainage problems on the North Shore. This article is about getting ahead of it.
What does a proper rainwater system actually handle?
The roof and the first ten feet
Most water problems start at the roofline and within the first few feet of the foundation. Properly sized gutters and downspouts, discharging well away from the building, solve more issues than any single expensive intervention below grade. It's unglamorous, and it's where the work should start.
Grading and the surface
Water should always be moving away from the structure. On sloped North Shore lots that's both an advantage and a hazard — gravity helps you, until it concentrates flow against a foundation, a retaining wall, or a neighbour's property. Surface grading and swales direct that flow deliberately instead of letting the site decide.
What happens below grade
Perimeter drainage, subsurface collection, and proper discharge handle the water you can't see. On older homes this is often the original failure point — systems undersized for today's rainfall, or silted up and no longer working.
Catchment and reuse, where it fits
Not every site needs it, but on the right project, capturing rainwater for irrigation or site use turns a liability into a resource — worth doing when the site and the client's goals line up, worth skipping when it would just add cost.
Permeable surfaces
How a driveway, patio, or walkway is built determines whether it sheds water onto the rest of the property or lets it soak in where it lands. Hardscape choices are part of the water strategy, not separate from it.
What about heritage and subdivided properties?
Older North Shore homes carry a particular challenge: their original water management was designed for a different era, with less rainfall and smaller trees. Decades later the systems are often undersized, buried, or gone — while the value of what they protect has only gone up. Newly created lots bring the opposite challenge: today's municipal stormwater rules require on-site rainwater management from day one, engineered to keep water off neighbouring properties and out of an overloaded storm system.
What did the 114 West Windsor rainwater system involve?
This one had both challenges at once. A large lot was being subdivided into additional lots, with the existing house relocated, and the District of North Vancouver's stormwater requirements for the subdivision called for a proper on-site system — capturing rainwater from the gutters and downspouts and managing it across the property before any of it reached the municipal storm drain. The requirement and the design sat with the developer and their consultants; we came in as the skilled-labour trade and built it.
The system we constructed moves water through the site in deliberate stages:
- Gutters and downspouts feed into bioswales built along the east side of the property.
- The bioswales drain into a sump.
- When the sump fills to a set volume, water flows into a catchment pit along the south side.
- From the catchment pit it moves into a rain garden in the southwest corner.
- The rain garden fills and absorbs what it can — and only once it reaches a set volume does the overflow discharge into the storm drain.
Each stage slows the water down and lets the ground take up as much as possible, so the property sends as little as it can to the municipal system. Our part was making it perform — clean grading, proper falls, and a rain garden built to hold and drain the way it was designed to. It's quite a process, and exactly the kind of work that doesn't show on the surface but decides whether a property handles a North Shore winter.
[INSERT 1–3 PROJECT PHOTOS — suggested alt-text: "Bioswale construction along the east side of a subdivided West Windsor lot, North Vancouver"; "Catchment pit and sump during rainwater system install, North Shore"; "Rain garden in the southwest corner of a North Vancouver property". Send when ready.]
What does rainwater management cost?
It varies widely, because the work scales with the site. Lot size and slope, soil and how well it drains, whether the system is required for a subdivision, and how many stages it needs all move the number. A simple regrade-and-downspout fix and a fully engineered bioswale-to-rain-garden system are different projects. It should be priced against your actual lot and goals rather than a generic figure. [INSERT RANGE — if you want a published starting point, tell me and I'll add it.]
How we approach rainwater work
We treat water as a whole-site problem, not a list of disconnected fixes. Whether we're running the job or working as the trade on someone else's design, the goal is the same: the grading, the drainage, and the surfaces above it should work together, not as separate scopes each hoping the others line up. On engineered systems we build to the project engineer's design so what's specified is what gets installed.
Common questions about rainwater management
Is rainwater management required by code on the North Shore?
Often — but usually through your municipality, not the building code. On-site stormwater management (bioswales, rain gardens, detention) is typically required for new lots, subdivisions, and major work under District of North Vancouver stormwater and subdivision-servicing rules. The BC Building Code covers the building side — roof drainage and structural rain load (for example, Sentence 4.1.6.4, Specified Rain Load). The exact obligation depends on your lot, so it's confirmed before work starts.
What's the difference between a bioswale, a catchment pit, and a rain garden?
A bioswale is a shallow, planted channel that slows water and lets it soak in as it moves. A catchment pit collects and temporarily holds water. A rain garden is a planted basin that absorbs and filters water, releasing only the overflow. Used together, they manage water in stages instead of sending it straight to the storm drain.
Can rainwater be captured and reused on site?
On the right project, yes — captured rainwater can feed irrigation or other site uses. It's worth scoping honestly: worthwhile when the site and your goals line up, and worth skipping when it would only add cost.
Do you handle the design, or build to someone else's?
Either. We can deliver the build as the skilled-labour trade on a design that's already been set, or coordinate the wider scope ourselves. On engineered or code-required systems we build to the project engineer's design, so what's specified is what gets installed.
Which areas do you serve?
North Vancouver, West Vancouver, Vancouver, Burnaby, Port Moody, Coquitlam, Squamish, Bowen Island, and Gambier Island.