Title 24 Window Compliance Placer County: Permits (2026)

Any permitted window replacement in Placer County, California must now meet the 2025 California Energy Code (Title 24, Part 6), which took effect January 1, 2026. For most of the county — Colfax, Auburn, Roseville, Rocklin, Loomis, Newcastle, Granite Bay, Penryn — that means a maximum U-factor of 0.27 and SHGC of 0.23 for the fenestration you install. For the high country portion of the county — Alta, Dutch Flat, Baxter, Blue Canyon, Emigrant Gap, Soda Springs, Norden — the U-factor is the same 0.27 but there is no SHGC ceiling. Your permit, your CF1R form, and your final inspection all hinge on getting this split right.

I'm John, owner of Colfax Glass. Placer County is a weird county for window compliance because the permit jurisdiction is the same but the climate zone is not. The dividing line runs roughly along the 4,000-foot elevation contour between Baxter and Alta on I-80. Below that line you're in Climate Zone 11. Above it you're in Climate Zone 16. The windows that pass inspection at a customer's home in Colfax might get flagged on a cabin in Soda Springs — or vice versa if you spec the wrong SHGC for the valley home. Inspectors catch this. I've watched them catch it.

This guide covers what the 2026 code requires by zone, how the CF1R compliance document works, when HERS (Home Energy Rating System) verification gets triggered, how the county treats alterations versus additions, and the step-by-step permit and inspection path. No tax credit promises — those expired December 31, 2025 under the One Big Beautiful Bill Act. Just the paperwork that actually gets a Placer County window project approved in 2026.

Title 24 applies any time you pull a permit. It also applies to a lot of projects homeowners wrongly assume are exempt. The 2025 code treats a fenestration alteration as any replacement that changes the window unit itself — glass, frame, or both — in an existing opening. A glass-only IGU swap in an existing sash is technically not an alteration under the code, because the frame and operable sash stay. A full window replacement — removing the old unit and installing a new one in the same rough opening — is a fenestration alteration and requires compliance.

Additions are treated more strictly. Any new opening in a new exterior wall triggers newly conditioned space rules, which use the prescriptive envelope tables in Section 150.1(c) of the code (California Energy Commission, 2025). The U-factor and SHGC ceilings are the same, but you also face area-weighted limits on total fenestration relative to the conditioned floor area of the addition.

Placer County Community Development Resource Agency (CDRA) requires a permit for any window replacement that enlarges an opening, any new opening cut into an exterior wall, any change in glazing area greater than 10 percent of the existing, and any replacement in a designated Very High Fire Hazard Severity Zone regardless of size. Like-for-like replacements in the same opening, with windows meeting prescriptive requirements, are permitted over the counter in most cases — but the CF1R form still gets filed with the permit.

Placer County is one of the few California counties that spans two Title 24 climate zones with meaningfully different rules. Climate Zone 11 covers the valley and lower foothills. Climate Zone 16 covers the mountain portion of the county above roughly 4,000 feet. The 2026 code tightened both zones to a 0.27 maximum U-factor, but SHGC (Solar Heat Gain Coefficient) rules split sharply (California Energy Commission, 2025).

In Climate Zone 11, SHGC must be 0.23 or lower. The reasoning is that hot inland foothill summers dominate the energy load. Blocking solar gain through the glass is worth more than collecting passive solar heat in winter. That's why every window we spec for a Colfax, Auburn, or Rocklin home has a low-solar-gain Low-E coating.

In Climate Zone 16, there is no SHGC ceiling. Mountain homes at elevation rely on passive solar gain for winter heating. Blocking that would raise heating costs more than it saves on cooling. So a window with a high SHGC — even 0.50 or above — is perfectly code-compliant in Soda Springs or Norden, as long as the U-factor hits 0.27. A high-solar-gain Low-E coating or even a clear dual-pane with a low-E sputter coating can qualify.

The practical problem for homeowners: a Colfax valley homeowner who has a second home in Tahoe will get different windows for each property. A window that ships with a low-solar-gain coating to pass in Auburn will fail to perform as well for passive solar in Truckee, and vice versa. If you use the same contractor and the same product line for both, make sure the glass package is specified per zone.

The CF1R is the Certificate of Compliance for residential projects. It is the document that proves the fenestration you're installing meets the prescriptive path of Title 24. Your permit application for a window project in Placer County is not complete without the correct CF1R attached (California Energy Commission, 2025).

For a typical window replacement, the form is CF1R-ALT-02 (Alterations — Fenestration). For a new addition, it is CF1R-ADD. For new construction, it is CF1R-NCB. The forms are generated through CEC-approved compliance software — most commonly EnergyPro or CBECC-Res — though for a straightforward prescriptive alteration, you can complete the CF1R directly through the CEC's online portal without software.

The CF1R-ALT-02 asks for the product line, the rated U-factor, the rated SHGC, the NFRC product ID, the square footage being replaced, and the compliance path. It is signed by a CF1R author, who is typically the homeowner, the contractor, or a certified energy consultant. It must match the actual windows you install down to the product line and NFRC number. Substituting a different window at install time without amending the CF1R will fail final inspection.

Keep the NFRC label on every window until final inspection. The inspector will verify the label against the CF1R. I tell every customer: never let a crew strip those labels early. Every now and then a carpenter rips them off during trim work before we've had our final — that creates a paperwork mess for everyone.

Most like-for-like window replacements in Placer County do not trigger HERS verification. HERS (Home Energy Rating System) field verification is required when you take a compliance path that uses credits beyond the prescriptive baseline, or when the project scope hits specific thresholds that demand independent third-party verification. For fenestration alterations alone, the prescriptive path with a compliant U-factor and SHGC keeps you outside HERS scope.

HERS gets triggered in a few common scenarios: when you are using the performance compliance path (trading off higher-performance windows for lower insulation elsewhere, for example), when the project includes HVAC changes tied to the envelope improvement, when you are applying for utility rebate programs that require HERS verification, or when the permit scope includes major alterations to duct systems, insulation, or HVAC equipment replacement alongside the windows.

A straightforward whole-house window replacement in Colfax, where you meet or exceed 0.27 U-factor and 0.23 SHGC and are not bundling other major alterations, typically files CF1R-ALT-02 and CF2R-ENV-01 and ends there. No rater, no additional inspection beyond the building official's final. That is the default path and the one that keeps a project fast and affordable.

If your project does trigger HERS, expect a 5 to 10 percent addition to the project cost — typically $400 to $900 for a single-family residence window scope — plus a scheduling step between rough-in and final. HERS raters in Placer County are listed through the CalCERTS and CHEERS provider directories.

Placer County Community Development Resource Agency processes residential window permits through its Auburn office at 3091 County Center Drive and through online applications via the Placer ePermits portal. The 2026 workflow is more digital than it used to be — most like-for-like replacements clear in 3 to 7 business days, sometimes same-day for over-the-counter applications.

The process starts with the permit application. You submit through Placer ePermits or in person at the Auburn CDRA office. For a straightforward alteration, you'll upload the CF1R-ALT-02, a site plan showing which windows are being replaced, manufacturer cut sheets or NFRC label images for every window, and a brief scope of work. Fees scale with valuation — expect $200 to $450 for a typical 6- to 12-window residential replacement.

After permit issuance, you can schedule inspections. For windows, most projects require two inspections: a rough-in or pre-drywall inspection (if you're opening walls) and a final. For pure sash-out, sash-in retrofits into existing frames, a single final inspection is typical. Schedule through the Placer ePermits portal or call the inspection request line at 530-745-3080.

The final inspection is where attention pays off. The inspector verifies the CF1R matches installed windows, confirms NFRC labels are still attached (or the installer-signed CF2R-ENV-01 is complete), checks flashing and waterproofing at the sill and head, and confirms egress compliance for any window in a bedroom or basement. If anything is missing, the project sits in correction status until resolved.

Title 24 gives you two compliance paths for a fenestration alteration: prescriptive and performance. For nearly every Placer County window replacement, the prescriptive path is faster, cheaper, and the right choice. The performance path is worth considering only when you want to use a window that misses the prescriptive ceilings, and you can make up the energy gap elsewhere in the project.

The prescriptive path is a checklist. You install windows that meet or beat the published U-factor and SHGC ceilings for your climate zone. You file the CF1R-ALT-02 confirming the product specs. You're done. No tradeoffs, no energy modeling, no HERS verification unless something else in the project triggers it.

The performance path is a whole-house energy model. You run the project through CBECC-Res or EnergyPro and demonstrate that the total modeled annual energy use is equal to or less than what a prescriptive-compliant version of the same house would use. This lets you install, say, a higher-solar-gain picture window for a view orientation in exchange for beating the insulation standard in the attic or upgrading the HVAC system. It costs more to document — expect $600 to $1,500 for the energy modeling alone, plus HERS verification — and it only makes sense when the windows you want are fundamentally incompatible with the prescriptive ceiling.

The one scenario where I steer customers toward performance path: a homeowner who absolutely wants a specific architectural window that just misses the 0.27 U-factor, usually because of a large fixed-picture design with slim sightlines. Rather than downgrade the design, they can trade it off against other envelope upgrades. But for standard double-hung, casement, or slider replacements in stock sizes, the prescriptive path is the right call every time.

The good news: most name-brand vinyl and fiberglass double-pane windows with argon fill and a low-solar-gain Low-E coating meet both the 0.27 U-factor and 0.23 SHGC requirement for CZ 11. The bad news: not every glass package within a given product line does, so you need the NFRC label for the specific configuration you're ordering — not the manufacturer's best-case marketing number.

For Colfax, Auburn, and the rest of CZ 11, we most commonly spec Milgard Tuscany or Trinsic vinyl with SunCoat MAX low-solar Low-E, Ply Gem Premium Series vinyl, Pella Impervia fiberglass with AdvancedComfort Low-E, and Andersen 100 Series with SmartSun. All of these have configurations that land at 0.27 U-factor or better and 0.23 SHGC or lower when ordered with argon fill and the right Low-E package.

For CZ 16 properties — cabins in Alta, Soda Springs, or Norden — we still use the same product lines but specify a high-solar-gain Low-E coating or in some cases a lower-e sputter coating to preserve passive solar benefit. Milgard PassiveSun, Pella AdvancedComfort High SHGC, and Andersen HeatLock are the configurations that fit mountain zone homes. These still hit 0.27 U-factor, but with SHGC in the 0.40-0.55 range, which is perfect for a zone with no SHGC ceiling.

Triple-pane options are available across all these brands and drop the U-factor into the 0.20-0.22 range. They exceed Title 24 by a comfortable margin and add real value in properties near Highway 80 noise or in the windiest ridgelines. They also add $250-$500 per window over comparable double-pane. For a deeper comparison of pane counts, the single vs double vs triple-pane window guide walks through where each one pays off.

Placer County inspectors see the same handful of problems on residential window projects. Knowing what gets flagged before the inspector shows up is the difference between a one-visit final and a corrections list that drags a project out by two weeks.

The most common failure I see is NFRC labels stripped off before final inspection. The homeowner or the trim carpenter wants a clean finished look, so the stickers come off too early. Without the labels visible — or a signed CF2R-ENV-01 installer certification documenting every unit — the inspector cannot verify compliance. The project then requires either a signed installer statement retrieved after the fact or a product documentation package from the supplier.

Mismatched products on the CF1R is second. Someone files a CF1R for a Milgard Tuscany with SunCoat MAX, and at install the supplier substitutes a similar but non-identical configuration. The NFRC numbers do not match. The fix is to amend the CF1R with the correct product, which can usually be done on site but creates delay.

Egress window failures are third, particularly on bedroom and basement replacements. Any sleeping-room window must meet California Residential Code Section R310 dimensions — minimum 5.7 square feet clear opening (5.0 for grade-floor), minimum 24-inch height, minimum 20-inch width, and sill height no higher than 44 inches above the finished floor. If you replace a bedroom window with a smaller unit or a different operating style that shrinks the clear opening, the inspector will fail it. The California egress window requirements guide covers the exact dimensions.

Flashing and sill pans are fourth. Placer County has seen a string of building envelope failures on retrofits that skipped proper sill pans or flashing integration at the head. Inspectors are actively looking for visible pan drainage slopes and membrane integration with the weather-resistive barrier.

The code treats existing-building alterations and new-construction additions differently, and the distinction affects your compliance paperwork, your HERS exposure, and in some cases your permit fee. A fenestration alteration replaces a window in an existing opening, or enlarges or reduces an opening in an existing wall, without adding newly conditioned floor space. An addition extends the conditioned envelope of the house into space that was previously outdoor, garage, porch, or unconditioned attic.

For alterations, the prescriptive ceiling is the single number you worry about: U-factor 0.27, and SHGC 0.23 in CZ 11. You file CF1R-ALT-02. You do not typically need area-weighted calculations or whole-envelope modeling. Like-for-like replacement is straightforward.

For additions, Title 24 Section 150.1(c) adds area-weighted fenestration limits. The total fenestration area in the addition cannot exceed a percentage of the addition's conditioned floor area — typically 20 percent, with some room to go higher by trading off performance elsewhere. This is where performance-path modeling sometimes becomes necessary, because a view-oriented addition with a lot of glass might exceed the prescriptive area limit and need tradeoffs.

A specific Placer County wrinkle: if you convert a garage to conditioned living space, the fenestration in the converted space is treated as newly conditioned — effectively an addition — even though the walls are existing. The CF1R for that project is CF1R-ADD, not CF1R-ALT-02, and the area-weighted fenestration rules apply. Homeowners often miss this and file the wrong form. Plan check catches it, and the project sits pending until the correct paperwork is submitted.

A typical like-for-like window replacement permit in Placer County clears plan check in 3 to 7 business days once the application is submitted with a complete package — CF1R, product cut sheets, site plan, and scope of work. Over-the-counter approvals for the simplest residential replacements happen same-day at the Auburn CDRA office about half the time.

More complex projects — additions, openings cut into new walls, projects within VHFHSZ that need Chapter 7A review, or projects triggering HERS — run 2 to 4 weeks through plan check. If your project is in a Very High Fire Hazard Severity Zone and includes Chapter 7A WUI review, expect the additional cycle. The WUI review is separate from Title 24 review and both have to clear before the permit issues.

Inspection scheduling is usually 1 to 3 business days out. You request inspections through Placer ePermits or the 530-745-3080 inspection line. Inspectors group requests geographically, so if your project is in Colfax or Alta, you may have a narrower daily window than an inspection in Auburn or Rocklin.

Final inspection passes on the first visit about 75 percent of the time in my experience — the other 25 percent is usually missing NFRC labels, missing installer CF2R-ENV-01 signature, or mismatched CF1R product data. If you go in knowing what the inspector checks, you land in the first bucket.

Any permit issued on or after January 1, 2026 falls under the 2025 California Energy Code standards. Projects with permits issued before that date under the 2022 standards can still close out under the prior code as long as work proceeds within the normal permit expiration timeline (typically 180 days without inspection activity). Placer County CDRA does not allow code-vintage shopping once a project has been delayed past permit expiration.

For homeowners planning window projects in 2026, this has one practical implication: do not rush to pull a permit under 2022 rules if your actual install date is months out. Permits expire, and you end up re-applying under the current code anyway. The U-factor gap between 0.30 (old code) and 0.27 (new code) is small enough that nearly every current-generation window ordered today meets both. Buy for the new code, file under the new code, and stop worrying about it.

The one place old code still matters is retrofit glass-only work. An IGU replacement in an existing sash does not trigger a fenestration alteration under Title 24 at all, as long as the frame and operable sash are not modified. The glass-only vs full window replacement guide walks through when a glass swap is a legitimate option. For homeowners with a failed seal on an otherwise sound window, that path avoids permit altogether.

The Title 24 2026 compliance path for a Placer County window project is simpler than the forms and acronyms make it sound. Confirm your climate zone (CZ 11 or CZ 16). Order windows that meet U-factor 0.27, with SHGC 0.23 in CZ 11 or any SHGC in CZ 16. File CF1R-ALT-02 with your permit application. Install the windows, leave the NFRC labels on, sign the CF2R-ENV-01 at completion, and pass final inspection.

The exceptions to this simple path are real but limited. If you are in a Very High Fire Hazard Severity Zone, Chapter 7A WUI compliance applies on top of Title 24. If you are adding new conditioned space, the area-weighted fenestration rules apply. If you are using the performance path to justify a window that misses the prescriptive ceilings, you need energy modeling and HERS verification. For everything else, the prescriptive path is the right call.

This is also the area where local knowledge makes a real difference. A Colfax or Auburn glass company that does this every week already knows which Milgard configurations hit 0.27/0.23, which Pella Impervia glass packages pass in CZ 11 versus CZ 16, and which plan checkers in the Auburn CDRA office look for what on a Thursday afternoon. At Colfax Glass we file CF1R-ALT-02 forms every week for Placer County projects. If you want a project scoped with the code already factored in — no surprises at plan check, no surprises at final — request a free project review and we'll walk through exactly what your scope needs.