Homeowner's Guide · North Vancouver
Why Is Your Floor Sloping or Sagging?
If a marble rolls across the room on its own, or a spot in the hallway feels like it gives underfoot, something below has moved. Here's what usually causes it, how worried to be, and how it actually gets fixed.
A sloping or sagging floor is one of the most common reasons homeowners call us — and one of the most misunderstood. It's almost never the floor itself; it's a signal from the structure underneath. The good news: caught early, it's very fixable. The key is figuring out why it's happening before anyone touches it.
The common causes
- Foundation settlement — if part of the foundation has dropped, the floors above follow it down. This is the most common structural cause, especially on the North Shore's sloped lots.
- Failing or undersized beams and posts — the main girders and support posts under your floor carry the whole load. When one rots, cracks, or was undersized to begin with, the floor above sags.
- Rot and moisture — a damp crawlspace or basement slowly weakens wood posts, beam ends, and joists until they lose their strength. Our wet winters make this a frequent culprit.
- Over-spanned or damaged joists — joists that span too far without support, or that have been notched or cut for plumbing and ducting, flex and dip over time.
- Original framing in older homes — many older North Shore homes were framed to the standards of their day, which don't always match modern loads.
How worried should you be?
A slope you can measure, a floor that bounces, or a dip that's clearly getting worse all point to active structural movement — that's worth a professional look sooner rather than later. A very slight, long-stable unevenness in a century-old home may be settled and stable. The way to know the difference is whether it's changing, and whether it comes with other signs: foundation cracks, doors that have started to stick, or gaps opening under baseboards. Our guide to the 7 signs of a structural problem covers the full pattern.
How sloping floors are fixed
The fix is matched to the cause — which is exactly why diagnosis comes first. Depending on what's found, the work may involve:
- Controlled jacking and re-leveling — bringing the floor back toward true, gradually and safely
- Beam and post replacement or sistering — restoring or reinforcing the failed support
- New footings or support posts — adding proper support where there wasn't enough
- Rot and moisture remediation — fixing the source so it doesn't happen again
- Underpinning — where the foundation itself has settled and needs re-support
For what these repairs typically involve and cost, see what foundation & structural repair costs.
Why "just leveling it" doesn't last
It's tempting to pour self-leveling compound or lay new flooring over a slope and call it done. But if the cause is structural, the movement continues underneath — and the slope returns, usually worse, having wasted the cosmetic fix. A repair that lasts addresses the support below the floor, not just the surface you walk on. That's the work we specialize in — see our floor leveling service.
Why this is common on the North Shore
North and West Vancouver combine older housing stock, steep and sloped lots, moving soils, and wet winters — the exact conditions that produce settling foundations and rotting supports. Sloping floors aren't a fluke here; they're a pattern these homes generate, and one we've been correcting for three generations.
Floors moving? Book a Structural Assessment
We'll come look, find what's really going on beneath the floor, and tell you honestly whether it's cosmetic or structural — then give you a clear plan and a fixed quote. No scare tactics.