Foundation Inspection Services
Reviewed 2026-07-30
A foundation inspection looks at cracks, settlement, bowing walls, and moisture intrusion. It tells you whether the movement is cosmetic, still active, or a structural safety concern.
Symptoms foundation inspection solves
- Cracks in the foundation wall, especially horizontal or stair-step patterns
- Doors and windows that stick or won't latch properly
- Sloping or uneven floors
- Gaps appearing between walls, ceilings, and floors
- Cracks in interior drywall running diagonally from door and window corners
- A foundation wall that appears to bow or lean inward
- Water intrusion or dampness along the base of foundation walls
When to book foundation inspection
- Before purchasing a home, especially one with visible cracks or a history of water intrusion
- As soon as you notice a crack wider than 1/4 inch or one that's actively widening
- When doors or windows suddenly start sticking without a seasonal explanation
- After a nearby excavation, drought, or flooding event that could affect soil conditions
What happens during foundation inspection
- Inspector documents all visible cracks with location, width, and pattern (vertical, horizontal, stair-step, or diagonal)
- Crack width is measured, often with a crack comparator gauge, and monitoring points may be installed for cracks under evaluation
- Floors are checked for level using a laser level or manometer to quantify slope
- Exterior grading and drainage are assessed, since poor drainage is a leading cause of foundation movement
- Interior signs — sticking doors, drywall cracks, gaps at baseboards — are correlated with exterior foundation findings
- Inspector issues a written report classifying findings as cosmetic, monitor, or requiring further structural engineering evaluation
Foundation Inspection methods and approaches
Visual crack and level survey
A systematic walk of the interior and exterior documenting every crack, measuring width and pattern, and checking floor level — the baseline of any foundation inspection.
Crack monitoring
Installing a crack monitor gauge across an active crack and re-measuring over 30-90 days to determine if movement is ongoing or has stabilized, per InterNACHI guidance for differentiating cosmetic from active cracks.
Structural engineering evaluation
For significant findings, an independent licensed structural engineer performs load calculations and soil assessment to determine the cause and recommend a specific repair method.
What drives foundation inspection pricing
- Whether the inspection is a general visual assessment or includes engineering-level analysis
- House size and foundation type (slab, crawl space, full basement)
- Accessibility of the crawl space or basement
- Whether crack monitoring equipment is installed for follow-up
- Whether a written report suitable for a real estate transaction is required
- Regional labor rates and engineer credentials
Questions to ask your foundation inspector or structural engineer
- Are you an independent inspector, or do you also sell foundation repairs? (Independent engineers avoid conflicts of interest)
- Which of the cracks you found are cosmetic versus concerning?
- Do you recommend crack monitoring before any repair decision?
- Is the foundation movement likely caused by drainage, soil type, or something else?
- Will I receive a written report with photos and measurements?
- Do you recommend a follow-up structural engineer evaluation?
Foundation Inspection safety and licensing
- Don't ignore a horizontal crack in a poured or block foundation wall — this pattern indicates lateral soil pressure and can progress to wall failure if untreated.
- Avoid hiring a foundation repair contractor to also perform the diagnostic inspection — a licensed structural engineer with no repair sales incentive gives an unbiased assessment.
- If you see sudden, rapid crack growth or the foundation visibly displacing, avoid using affected rooms and get an engineer out immediately.
Foundation Inspection questions homeowners ask
How do I know if a foundation crack is serious?
Horizontal cracks, stair-step cracks wider than 1/4 inch, and cracks with visible displacement between the two faces of the crack are considered serious and warrant a structural engineer, per InterNACHI guidance.
Should I hire a foundation contractor or a structural engineer first?
A structural engineer for an independent evaluation, before a foundation contractor, since contractors who diagnose and sell the repair have a built-in conflict of interest.
Are hairline foundation cracks normal?
Yes — hairline cracks under 1/16 inch that appear within the first two years of a home's life are typically normal concrete curing shrinkage and not structural.
Problems that lead to foundation inspection
- Why Is My House Developing Wall Cracks?
- Why Is My House Getting Sloping Floors?
- Why Is My House Getting Doors That Stick?
- Why Is My House Making Creaking Noises at Night?
- Why Is My House Getting a Sagging Ceiling?
Sources for this foundation inspection guide
- InterNACHI Standards of Practice for structural inspections
- American Society of Civil Engineers (ASCE) foundation guidance
- International Residential Code (IRC) foundation provisions