How to Insulate a Crawl Space Basement
Insulating a crawl space basement is one of the smartest upgrades we can make for comfort, energy savings, and long-term home health. Done right, it keeps cold floors away, manages…
Insulating a house typically costs between $1,500 and $6,500, depending on the insulation type, wall access, climate, and labor rates. Most homeowners see lower energy bills within the first year, especially in colder or mixed climates like the Pacific Northwest.
Quick answers that matter most:
Insulation pricing is not one-size-fits-all. Costs depend on material choice, home size, wall condition, and whether the project is new construction or a retrofit. According to guidance from the U.S. Department of Energy, insulation performance is measured by R-value, which directly affects both upfront cost and long-term savings.
Before choosing a material, it helps to understand where your money goes and what you get back in comfort and efficiency.
Different insulation materials serve different needs. Some focus on affordability. Others prioritize fire resistance, moisture control, or soundproofing. Below is a clear breakdown of common wall insulation options.
Fiberglass batts are one of the most widely used and budget-friendly options.
Fiberglass works best when installed carefully. Poor fit leads to heat loss, which is why professional installation matters even with low-cost materials.
Mineral wool, also called rock wool, is denser and more durable than fiberglass.
Builders often choose mineral wool for added safety. It maintains performance even when exposed to moisture.
Rigid foam boards offer strong thermal resistance in a thin profile.
Rigid boards are common in energy-efficient builds where space and performance both matter.
Blown-in cellulose is popular for retrofitting existing homes.
Many contractors recommend cellulose when walls cannot be opened without major demolition
| Insulation Type | Cost Per Sq. Ft. | Typical R-Value | Best Use Case |
|---|---|---|---|
| Fiberglass Batts | $0.65–$2.00 | R-13 to R-21 | Open walls |
| Mineral Wool | $1.50–$3.00 | R-15 to R-23 | Fire safety |
| Rigid Foam Board | $2.00–$4.50 | R-4 to R-6.5 per inch | Continuous layers |
| Blown-In Cellulose | $1.00–$2.50 | R-3.2 per inch | Existing walls |
Insulation is not just about comfort. It directly affects monthly costs and resale value. Data from the U.S. Environmental Protection Agency’s ENERGY STAR program shows that homeowners can save an average of 15 percent on heating and cooling costs after upgrading insulation.
Better insulation also:
Buyers notice these benefits, especially in regions with cold winters and rising energy prices.
Material cost is only part of the equation. Labor, prep work, and access can change the final price.
Industry pricing data from HomeAdvisor’s insulation cost guide confirms that wall insulation projects often cost more than attic work due to access challenges.
Some insulation projects look simple but go wrong fast. Poor installation leads to gaps, compression, and wasted money.
Professional installers help by:
In the Seattle area, moisture control is especially important. Incorrect installs can trap damp air inside walls.
There is no universal best option. The right choice depends on your goals.
A site inspection often reveals issues you cannot see from inside the house.
Insulating your home is one of the most reliable ways to lower energy bills and improve comfort. Costs vary, but smart material choices and proper installation make a real difference over time.
If you want clear pricing and honest advice, Cascadia Spray Foam of Seattle can help you choose the right insulation for your walls and climate.
Call: (425) 386-3500 Email: [email protected]
A quick consultation can save you years of wasted energy.
Most homeowners spend $3,000 to $6,000, depending on material and wall access.
Yes. Energy savings and comfort improvements often pay back the cost within a few years.
Yes. Blown-in cellulose is designed for closed-wall installations.
Mineral wool and rigid foam boards can last decades with little performance loss.
Dense materials like mineral wool and cellulose reduce sound transfer between rooms.
Some projects qualify for federal credits when they meet ENERGY STAR standards.
