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.
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.