Do they inspect first
A good contractor looks in the attic, the walls and the crawl space before quoting. A price by phone cannot account for moisture, old insulation or leaks.
Ask what they will check and whether you receive photos.
Do they talk about air sealing
Insulation without air sealing underperforms. A contractor who raises air leaks, ventilation and moisture is thinking about the whole house.
Be wary of a pitch that is only about adding more material.
Can they explain the materials
They should explain why they recommend fiberglass, cellulose or foam for your space and what the tradeoffs are.
Honest answers include the limits of each product.
What do they put in writing
A proposal should list areas, materials, R-values, depths, prep work, cleanup and exclusions. Ask what happens if they discover wet or damaged material.
Written scopes prevent surprises.
References and verification
Ask for recent customers you can call and check how the company treats reviews and questions. Ask about training for spray foam installers.
Confirm business and any required credentials with the relevant authority yourself.
Cleanup and follow-up
Insulation can be messy. Ask how they protect floors, where the equipment runs and how the attic is left. Ask how to reach them after the job.
Good contractors expect these questions.
Choose the contractor who inspects first, explains why and puts the scope in writing.
