A structural inspection can cost anywhere from $300 to $800, but asking the wrong questions could cost you tens of thousands in hidden damage. Before you hire, you need to know whether the inspector actually walks the roof, what certifications they hold, and whether they'll catch foundation cracks that matter versus cosmetic ones. This guide walks you through the critical questions that separate thorough inspectors from box-checkers.
Credentials and Licensing
Start by asking what certifications the inspector holds. Look specifically for:
- Structural Inspector Certification (varies by state—some states don't license structural inspectors, which is a red flag)
- Home Inspector Certification (many inspectors hold ASHI or NAHI credentials)
- Professional Engineer (PE) license (not always required, but valuable for complex foundation or structural issues)
Ask how long they've been inspecting structures specifically, not just general home inspections. Someone who's spent five years doing 200 general home inspections isn't the same as someone who's spent three years focusing on structural and foundation work. Also confirm they carry liability insurance—at least $1 million in coverage.
Scope of Work: What Gets Inspected
Don't assume all inspectors examine the same things. Ask explicitly:
For the foundation:
- Will they go into crawlspaces or basements and look for cracks, settling, efflorescence, or water damage?
- Do they measure and photograph cracks (width, length, direction)?
- Will they identify whether issues are structural or cosmetic?
For the roof:
- Will they physically walk the roof or observe from the ground?
- Do they inspect underneath—attic framing, ventilation, moisture signs?
- Will they identify remaining roof life and spot active leaks?
For overall structure:
- Will they check for sagging floors, bearing walls, or joist damage?
- Do they use moisture meters to detect hidden water damage in wood framing?
Many inspectors won't climb onto older roofs due to liability, which is reasonable—but they should disclose this upfront. If they skip the roof walk, expect a lower price ($150–200 less), but you'll need additional roof-specific inspection if the home is over 20 years old.
Report Quality and Turnaround
Ask what the final report includes:
- Photos or video: Good inspectors photograph issues and problem areas. Avoid inspectors who deliver reports without visual documentation.
- Severity ratings: Can they clearly mark items as "needs immediate repair," "monitor," or "cosmetic"?
- Repair estimates: Some inspectors provide ballpark estimates for identified issues; others don't. Know what to expect.
- Turnaround time: Most deliver reports within 24–48 hours. Anything longer than a week is slow.
Request a sample report before hiring. You'll immediately see whether they're detailed or vague. A good structural inspection report is 15–25 pages with photos; a five-page report is insufficient.
Cost Structure and Warranties
Ask about pricing upfront:
- Base inspection cost: $400–650 for a typical residential structural inspection
- Add-ons: Roof-only inspections (+$150–250), foundation-only inspections (+$100–200), drone inspections (+$200–400)
- Travel fees: Some charge for mileage if you're outside their service area
- Re-inspections: Will they return if sellers make repairs? Costs often range $150–300
Also ask if they offer any warranty on their work. Most inspectors carry errors and omissions insurance, but some will explicitly stand behind their findings if they missed something major within 12 months.
Post-Inspection Support
A good inspector doesn't disappear after submitting the report. Ask:
- Will they explain findings over the phone or in person?
- Can you call with clarification questions?
- If the seller makes repairs, will they re-inspect to verify?
- Can they recommend contractors for follow-up work?
Inspectors who avoid post-inspection communication are prioritizing speed over accuracy.
Timeline and Availability
Ask when they can schedule. For urgent sales, availability matters. Typical timelines are 5–10 business days out, but busy seasons (spring/summer) can stretch to 3–4 weeks. Also confirm the inspection itself takes 2–3 hours for a standard residential property.
Using a platform like Mercoly lets you compare multiple certified structural inspectors, read verified reviews, and see their actual reports side-by-side before hiring.
Frequently Asked Questions
Q: Do I really need a structural inspection, or can a general home inspector catch everything? A: General home inspectors are trained to spot obvious issues, but structural and foundation problems require specialized knowledge—a general inspector might miss signs of foundation movement or recognize a load-bearing wall issue. Hire a structural specialist if the home is over 40 years old, has foundation cracks, or sits in a high-risk flood or soil-movement area.
Q: How long do structural inspection results take, and can I delay closing while waiting? A: Most inspectors deliver detailed reports within 24–48 hours; you can typically negotiate 7–10 days for inspection contingencies in your purchase agreement, giving you time to review findings and order follow-up inspections if needed.
Q: What's the difference between a structural inspector and a foundation specialist? A: A structural inspector evaluates the entire building's framework and foundation; a foundation specialist focuses exclusively on subsurface issues like soil settlement, hydrostatic pressure, and foundation repair needs, and often requires a PE license.
Compare certified inspectors and find the right fit for your property inspection needs.