Looking for a spray foam installer in Redwood City, CA? Describe your project once and up to three spray foam installers who work in Redwood City and San Mateo County get back to you with a quote. It's free and there is no obligation.
Redwood City is home to about 82,982 people (2024 Census Bureau estimate), a shrinking community (−1.6% since 2020). With 4,292 people per sq mi, it is a densely built-up area. Hot summers, cold winters and leaky older homes make air sealing a priority here.
Redwood City at a glance
- Population (Census Bureau estimate, 2024)
- 82,982 (−1.6% since 2020)
- Rank in California
- 104th of 482 cities and towns
- Land area
- 19 sq mi
- Population density
- 4,292 people per sq mi (densely built-up)
- Type
- City (Redwood City city)
- Main county
- San Mateo County
What to check before hiring in Redwood City
- Training: ask about applicator training and safety practices.
- Code: in California, the energy and residential codes set R-values and barrier requirements.
- Rebates: utilities sometimes rebate insulation upgrades.
- Price drivers: area, foam type, thickness and prep.
Useful official resources
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U.S. Department of Energy: insulation
Official information and guidance.
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Spray Polyurethane Foam Alliance
Official information and guidance.
Services available in Redwood City
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Attic spray foam
Spray foam on the roof deck or attic floor, often to create a conditioned attic.
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Walls, rim joists and crawl spaces
Spray foam in open walls, rim joists, basements or crawl spaces.
Frequently asked questions in Redwood City
How much does spray foam cost in Redwood City, CA?
It depends on area, foam type and thickness. Describe your project: installers who serve Redwood City reply with a quote.
How long does installation take?
Often a day for a typical attic, plus curing time.
Can foam go over old insulation?
Usually old material is removed first; ask the installer.
Which spray foam installers will contact me?
Up to three independent spray foam installers who serve Redwood City and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.