Pre-Purchase Crawlspace Inspection Checklist
What to look for in a crawlspace before you finalize a home purchase in Surrey or the Lower Mainland — issues that standard home inspections often miss.
A Standard Home Inspection Is Not a Crawlspace Inspection
Most buyers in Surrey and the Lower Mainland get a general home inspection before completing a purchase. These inspections are valuable but cover a lot of ground in two to three hours, with maybe 15 minutes total spent on the crawlspace. A dedicated crawlspace inspection takes 60 to 90 minutes and goes deeper.
Pre-Inspection Walkthrough Items
Walk the exterior before the inspector arrives:
- Grading. Does the soil slope away from the foundation, or pool against it?
- Downspouts. Where do they discharge? Splash blocks against the foundation are a red flag.
- Vegetation. Plants and bark mulch right against the stem wall trap moisture.
- Visible cracks. Photograph any in the foundation wall before the inspector goes inside.
Inside the Crawlspace — What to Watch For
Moisture indicators
- Standing water or visibly wet patches
- Mineral staining (efflorescence) on stem walls
- Mud or silt deposits suggesting past flooding
- Tide marks on framing or piers
- Condensation droplets on ductwork or framing
Mold and biological
- Dark staining on joists or sheathing — could be mold
- Musty odor (a strong indicator regardless of visible mold)
- Visible rodent waste or nesting material
Structural
- Sagging beams or center support members
- Posts resting directly on soil rather than concrete footings
- Notched, cut, or otherwise compromised joists
- Soft or punky wood when probed with a key or screwdriver tip
Insulation and barrier
- Damp, sagging, or compressed fiberglass insulation
- Missing or torn vapor barrier
- Bare soil floor with no membrane
Ask for Numbers
A good inspector takes moisture readings and humidity readings, not just visual assessments. Sustained framing moisture above 19% is a quantitative red flag. Crawlspace humidity above 70% in winter signals moisture problems even if no visible mold has formed yet.
What to Do With Negative Findings
Negative findings are not necessarily deal-breakers — they are negotiating points. Real-cost remediation estimates from a crawlspace specialist often translate directly to price reductions or seller-funded repairs. The danger is unaddressed problems you do not know about until after you have closed.
Worth the Cost
A specialist crawlspace inspection costs a few hundred dollars. It can identify issues representing tens of thousands in remediation. On a major Surrey purchase, this is one of the highest-leverage due diligence items available.