Home Energy Audit Cost - Same-Day Service, Done Right the First Time

How Much Does Home Energy Audit Cost in San Francisco?

A home energy audit in San Francisco typically costs between $250 and $650 for a standard single-family home, with larger Victorians or multi-unit properties running $700 to $1,200+. At Thistledown Insulation San Francisco, we provide a written price before any work starts, and our audits come with insulation findings you can act on immediately, not a generic report.

Key takeaways:

• Standard single-family home audit in SF: $250 – $650
• Larger Victorian or multi-story homes: $700 – $1,200+
• Blower-door test add-on: $100 – $200
• Infrared thermal imaging: often bundled, sometimes $75 – $150 separately
• Free estimates from Thistledown: (341) 247-0222

Most San Francisco homeowners schedule an audit because rooms feel drafty, the furnace runs constantly, or the PG&E bill keeps climbing even when the thermostat stays put. The audit pinpoints exactly where air moves through the building envelope, and nearly every SF home we audit has at least one attic-related finding. That’s our area of focus here at Thistledown, a Cedarwell-family company serving San Francisco homeowners since 2003. If you want to know what an audit actually costs in this city and what you’ll get for that money, keep reading. You’ll find real numbers, not ranges that float.

Home Energy Audit Cost Breakdown (2026)

Here is what homeowners in San Francisco can expect to pay, line by line, based on what we see in the field and what reputable auditors across the city charge in 2026.

A few things move these numbers up or down. If your home is a 1906 Edwardian with a converted attic and a post-foundation addition, the inspector needs more time and the report gets longer. If you’re in a newer Marina or Mission Bay condo, the audit usually lands on the lower end. Homes in the fog belt, which includes the Richmond District, Sunset District, and Parkside, have moisture and condensation issues that add inspection steps. Homes in the warmer eastern neighborhoods, like Bernal Heights or the Mission, often have the opposite problem: heat gain through under-insulated attics that cook the top floor from May through October. Our home energy work in San Francisco covers all of it.

What Affects Home Energy Audit Pricing in San Francisco

• Home size and layout. A 900-square-foot Marina flat takes less time than a 3,200-square-foot Outer Richmond Victorian with a finished attic and a converted garage. The auditor charges for time, and older homes take more time.
• Attic accessibility. Some San Francisco attics are tight. If the hatch is in a closet or the joists are spaced irregularly, the inspection takes longer, and a blower-door test may require more setup. We work carefully in these spaces, wearing shoe covers and laying drop cloths from the front door to the attic hatch.
• Number of HVAC systems and appliances. A home with a furnace, water heater, and gas stove in the garage plus a second water heater for an in-law unit requires more combustion safety testing than a single-system condo.
• Test complexity. A basic visual audit is cheaper. Adding a blower-door test and infrared imaging turns it into a diagnostic audit with more data and a higher price.
• Rebate program requirements. BayREN and PG&E programs sometimes require a certified auditor who follows specific reporting protocols. That audit typically costs $300 to $650 because of the documentation involved, but the rebate can offset it.
• Time of year. Late fall and winter are busier, and some auditors charge a premium in December and January when demand spikes. Summer availability tends to be more flexible.

One note that’s specific to San Francisco: many homes here have flat roofs or low-slope roofs over living space, which changes how the auditor assesses insulation. You can’t just walk into a standard attic when there isn’t one. The auditor has to evaluate the roof assembly differently, and that adds time. If you live in a neighborhood like Noe Valley or Glen Park where flat-roofed mid-century remodels are common, expect your audit to include that extra step.

Is a Home Energy Audit Worth It in San Francisco?

For most San Francisco homeowners, yes. The audit usually pays for itself within the first year of correcting the biggest air leak or insulation gap. PG&E rates in San Francisco rank among the highest in California, and heat loss through an unsealed attic can account for 25 to 40 percent of your heating cost. Fixing that one issue often saves $200 to $400 per year, which means a $400 audit pays for itself in one to two heating seasons.

There’s another reason the audit matters here. San Francisco homes are old. Many were built before insulation was standard, and a surprising number have had insulation installed incorrectly over the years. We regularly find attics in the Sunset and Richmond where fiberglass batts were laid paper-side up, which creates condensation problems. In the Mission and Potrero Hill, we see attics where someone added R-19 on top of old wiring that should have been addressed first. An audit catches these issues before they become expensive problems.

If you’re planning to stay in your home for three or more years, the audit is a straightforward financial decision. If you’re selling within a year, a seller’s energy audit can support your listing, but most buyers in this market won’t require it.

How to Save on Home Energy Audit in San Francisco

• Check BayREN and PG&E rebate programs. San Francisco participates in BayREN, and some audits qualify for rebates or reduced pricing through participating contractors. Ask the auditor if they’re a BayREN registered contractor before you book.
• Bundle the audit with insulation work. If you already know you need attic insulation, ask about combining the audit with the installation. At Thistledown Insulation San Francisco, we can often fold the diagnostic steps into the overall home energy audit in San Francisco so you’re not paying twice for the same assessment.
• Ask for a written quote before booking. Some companies quote a range then bill the top of it. We give every customer a written price before any work starts, whether it’s an audit or an insulation install. You know the number before we arrive.
• Schedule during the off-peak season. You’ll have more flexibility with scheduling between March and September, and some auditors offer lower rates during slower months.
• Call us for a free estimate at (341) 247-0222. We’ll talk through what your home needs and give you a straight answer about cost before anyone picks up a tool.

What Happens During a Home Energy Audit?

Here’s what to expect when an auditor walks through your San Francisco home.

The walkthrough

The auditor starts with a room-by-room inspection of the building envelope: windows, exterior doors, baseboards, outlets, recessed lights, attic access, and crawl space entry points. They’ll look at the furnace, water heater, and any gas appliances. They’ll ask about cold rooms, drafts, and whether the upstairs feels hotter than the downstairs in summer.

Attic inspection

This is where we spend the most time at Thistledown. The auditor checks insulation type, depth, coverage, and condition. They look for gaps around chimneys, plumbing vents, recessed lights, and the attic hatch itself. They check for moisture, rodent activity, and whether the existing insulation was installed correctly. We document everything with photos so you can see what we saw.

Blower-door test (if included)

This test uses a calibrated fan mounted in an exterior door frame to depressurize the house. It measures how much air leaks through the building envelope. The auditor will walk the house while the fan runs, feeling for air movement at windows, outlets, and baseboards. The result is a CFM50 number that tells you exactly how leaky the home is compared to building standards.

Infrared scan (if included)

An infrared camera reads surface temperatures and shows where insulation is missing or compressed inside walls and ceilings. It’s a fast way to see problems you can’t see from the attic hatch.

The report

You should get a written report within a few days. It lists findings in priority order, estimated costs for recommended fixes, and any rebate documentation. Ours includes specific product recommendations from the eight brands we install: Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. If your audit reveals an attic insulation problem, we can quote the repair on the spot.

What We Find in San Francisco Attics

After two decades of working in San Francisco homes, we can tell you what the audit typically turns up in this city. It’s local knowledge that generic national articles can’t give you.

In the Sunset and Richmond Districts: fog-driven moisture plus insufficient attic ventilation. Condensation builds on the underside of the roof sheathing, and insulation gets damp and loses its R-value. We regularly see this in homes built between 1930 and 1960.

In the Mission, Bernal Heights, and Potrero Hill: old or absent insulation combined with south-facing attic spaces that bake in the afternoon sun. Top-floor bedrooms get uncomfortably warm, and the furnace runs hard on winter nights because the heat escapes through the attic.

In Noe Valley and Glen Park: flat-roof and low-slope roof assemblies on mid-century remodels. Many of these homes were insulated when building codes allowed much lower R-values, and the roof assembly is hard to upgrade without opening the ceiling.

In the Marina and Cow Hollow: 1920s and 1930s construction with uninsulated walls and sometimes uninsulated attics. Air leaks around old windows and exterior doors are a bigger issue than the attics themselves, but an audit will document both.

In the Excelsior and Ingleside: post-war homes with minimal attic insulation, often R-11 or less, where adding R-38 to R-49 makes an immediately noticeable difference in comfort and heating cost.

The audit gives you a map. The report tells you where air leaves your home and where it enters. Everything after that is a fix you can budget for.

How Thistledown Insulation San Francisco Approaches Energy Audits

We’re an insulation company, not a general contracting firm, so our audits focus on what we know best: the attic, the building envelope, and how air moves through your home. The point of our audit is to give you actionable information about insulation and air sealing, not to sell you a long list of unrelated upgrades.

When we arrive at your home, our uniformed, background-checked technicians put shoe covers on at the front door. We lay drop cloths across your hallway from the entry to the attic hatch, so the path stays clean. We ask before we move or touch anything. If your kids are napping or your dog is home, we work quietly and choose pet-safe insulation products where a choice exists, so the dogs can stay home during the job. These are the Cedarwell Care Promise standards we’ve followed since 2003, and they’re not optional on any visit, audit or install.

We also explain the price before the work. You’ll have a written number before we touch a rafter, and that number doesn’t change unless you change the scope. Our 365-Day Done Right Promise means if the work isn’t done right, we make it right. No debate, no fine print.

The name Thistledown comes from the soft fluff of the thistle, one of nature’s lightest insulators. The name is a promise about how carefully we work.

FAQs – Home Energy Audit Cost in San Francisco

How much does a home energy audit cost in San Francisco?

In San Francisco, a home energy audit costs $250 to $650 for a standard single-family home in 2026. Larger Victorians or multi-unit buildings run $700 to $1,200+. Blower-door testing adds $100 to $200 if it’s not already included. Call (341) 247-0222 for a free estimate and we’ll give you a written price before any work starts.

Is a free energy audit available in San Francisco?

Some utility programs and contractors offer promotional free audits, but they’re often limited to a quick visual walkthrough without blower-door testing or infrared imaging. A full diagnostic audit in San Francisco runs $250 to $650. We offer free estimates for insulation work and can discuss audit pricing with you directly at (341) 247-0222.

Can you fix insulation problems found during the audit the same day?

Sometimes yes. If the audit finds a simple gap in attic insulation or an unsealed attic hatch, we can often address it immediately. Bigger jobs, like removing old insulation or installing R-38 to R-49 across a full attic, get scheduled as a separate visit with a written price before we start.

How much does attic insulation cost after an audit in San Francisco?

Attic insulation in San Francisco typically runs $1,500 to $4,500 for blown-in fiberglass or cellulose across a standard attic, depending on square footage and access. Spray foam runs higher, typically $3,000 to $8,000 or more for a full attic application. Your audit report will include a specific recommendation and number for your home. Call (341) 247-0222 for an exact quote.

Does PG&E or BayREN cover the cost of an energy audit?

PG&E and BayREN programs in San Francisco sometimes offer rebates or reduced pricing for certified home energy audits, but coverage varies by program year and home eligibility. Ask about current program availability when you call. We can walk you through what’s available in San Francisco right now at (341) 247-0222.

How long does a home energy audit take in San Francisco?

Most San Francisco single-family home audits take two to four hours, depending on home size and whether blower-door testing or infrared imaging is included. Older Victorians with multiple attic zones and finished basements can take longer. We’ll give you a time estimate when you book.

Ready to Know What Your San Francisco Home Actually Needs?

A home energy audit gives you the numbers and the map. We’ll walk through your home, document what we find, and hand you a written report with prioritized fixes and real dollar figures. If the audit points to attic insulation, we can quote that work on the spot and schedule it with the same care standards we’ve used in San Francisco since 2003. Call Thistledown Insulation San Francisco at (341) 247-0222. A live person answers 24 hours a day, 7 days a week, and estimates are free.

Pricing reflects the San Francisco market as of 2026. Thistledown Insulation San Francisco offers free estimates – call (341) 247-0222. Written by Neil Barron, Owner at Thistledown Insulation San Francisco, serving San Francisco since 2003.