Guides & advice · Insulation
Insulation: costs, choices and hiring advice
Keep the heat where you want it and shrink your energy bill. Here is what to know before you get quotes.
What it costs
$498–$4,500
Insulation is priced by area and type. Attic insulation is often the most cost-effective place to start.
- Topping up a 1,000 sq. ft. attic with blown-in insulation$975–$2,200
- Insulating 1,000 sq. ft. of existing walls$1,000–$4,000
- Unfinished basement walls, 800 sq. ft.$1,200–$2,000
Choices that change the price
- Batts, blown-in or spray foamBatts are the least expensive and suit open framing.
- Air sealing firstSealing gaps around wires, pipes and attic hatches before adding insulation often makes the biggest difference in comfort.
Problems and hidden costs to watch for
- Old insulation removalDamaged, wet or pest-contaminated insulation may need to come out first.
- VentilationAttic vents must stay open.
- Knob-and-tube wiringOlder wiring may need to be evaluated by an electrician before insulation goes over it.
Upkeep and lifespan
- Check after roof leaksWet insulation loses much of its value.
Hiring and comparing quotes
- What R-value will I have after the work?
- Is air sealing included?
- Will you add baffles to keep attic vents clear?
- Do you need to remove old insulation first?
All insulation guides
Costs, budgets and timelines
- Insulation cost guideNational prices, example budgets and what each price covers
- Attic Insulation Removal and Replacement CostRemoval averages about $900, or $1–$2 per sq. ft. of attic. When removal is actually necessary and what disposal includes.
Repair, replace or choose
- Attic Ventilation vs. Insulation: Different Problems, Different FixesInsulation slows heat moving into the living space; ventilation removes heat and moisture from the attic. Symptoms of each problem and the fixes.
- Attic Air Sealing vs. Adding Insulation: Which Comes First?Seal air leaks before adding insulation. Why the order matters, where attic leaks usually are, and what each costs.
Buying guides
- Weatherstripping vs. Caulk: Where Each BelongsWeatherstripping seals parts that move; caulk seals joints that do not. Which product to use where, door sweeps by door type, and what not to seal.
Hiring and comparing quotes
- How to Compare Contractor Estimates (With an Annotated Example)Line up scope, quantities, allowances, exclusions and warranty terms so you compare the same job, not just the bottom line.
- Questions to Ask Before Hiring a ContractorA practical checklist for the first call, the estimate visit and before you sign, plus links to project-specific questions.
- How to Verify a Contractor's License and InsuranceWhere to look up a license, how to confirm insurance with the insurer, and what each check does and does not tell you.
- Quote comparison worksheetLine up up to three quotes side by side
Budget tools
Cost figures are national ranges from the sources listed in the cost guide. They are not a quote from FixFinch or any contractor.