Title 24 Energy Compliance for San Diego Remodels (2026): What Triggers It, Mandatory Upgrades, and Cost Impact

By Fares Azani, Licensed General Contractor – CSLB #1054602 | Published October 4, 2026

Here is the conversation I have with San Diego homeowners at least twice a month: the plans are done, the budget is set, permits are about to go in — and then somebody mentions Title 24. The homeowner goes pale. The designer says "oh, we will figure that out in plan check." And the project picks up a surprise $5,000 to $15,000 line item nobody budgeted.

Title 24 is California’s Energy Code (Part 6 of the California Building Standards Code). It is not new. What is new is that the 2025 Energy Code took effect January 1, 2026, and it tightened several requirements that land squarely on remodels and additions. If your project touches heating, cooling, water heating, lighting, windows, or adds conditioned square footage, this article is the plain-English version of what your contractor should have told you before you signed.

I am Fares Azani, owner of Cali Dream Construction. We have been building and remodeling across San Diego County since 2019 — kitchens, baths, ADUs, whole-house remodels — and we have shepherded hundreds of projects through Title 24. Here is how it actually works.

Which Code Applies to Your 2026 Project

California updates the Energy Code every three years. The 2022 code governed permits from 2023 through 2025. Permits submitted on or after January 1, 2026 are judged against the 2025 Energy Code. That date matters more than most people realize: your permit is evaluated under the code in effect the day the city or county accepts a complete application.

Practical consequence: if your designer is still working off 2022-code templates — and plenty are — the plan checker will hand you corrections. Each correction cycle at the City of San Diego Development Services Department or the County’s Planning & Development Services runs roughly 2 to 4 weeks. Ask your designer, in writing, which code cycle the energy documentation was prepared under. It takes ten seconds and saves a month.

If you are still deciding whether your remodel even needs a permit in San Diego, start there — Title 24 only enters the picture once a permit is in play.

What Actually Triggers Title 24 on a Remodel

The energy code does not care about paint, tile, cabinets, or countertops. It cares about regulated systems: the building envelope, space heating and cooling, water heating, and lighting. On a remodel, the common triggers are:

• HVAC changeout. Replacing a furnace, air conditioner, or heat pump is the single most common trigger. A like-for-like equipment swap still triggers duct testing and efficiency minimums.
• Ductwork alterations. Extending, replacing, or significantly altering ducts triggers duct sealing and leakage testing requirements. This one surprises people on kitchen remodels where a wall comes down and the ducts get rerouted.
• Additions. Adding conditioned square footage — a bedroom addition, an enclosed patio conversion, a bump-out — triggers envelope, mechanical, and lighting requirements for the new space, and in some cases pulls existing systems into compliance review.
• Window replacement. Replacing a meaningful amount of glazing triggers fenestration efficiency requirements (U-factor and SHGC ratings). Swapping single-pane for dual-pane is usually an upgrade, but the paperwork still has to show the numbers.
• Water heater replacement. New water heating equipment must meet current efficiency standards, and fuel-type changes can trigger additional requirements.
• Lighting alterations. Altering lighting in larger scopes triggers high-efficacy and control requirements — vacancy sensors, dimmers, and JA8-compliant fixtures in the altered areas.
• Re-roofing. In many San Diego climate zones, a re-roof triggers cool-roof requirements, which is either a reflective roofing product or added insulation to compensate.

The pattern: cosmetic remodels rarely trigger Title 24; system remodels almost always do. A hall bath refresh with new tile and fixtures? Usually clean. A kitchen remodel that moves the range, reroutes ducts, and adds recessed lighting? You are in Title 24 territory. For the full permit picture, see our 2026 San Diego remodel permit guide.

The Three Forms Nobody Explains: CF-1R, CF-2R, CF-3R

Title 24 compliance on a remodel runs on three certificates, and each one has a different owner. When these get mixed up, inspections fail.

• CF-1R — Certificate of Compliance. Prepared before permit submittal, usually by an energy consultant or your designer using compliance software (EnergyPro or similar). This is the document that proves your design meets the code, either through the prescriptive path (every component meets a checklist) or the performance path (software models the whole building and shows it beats a baseline). It goes into the plan set. No CF-1R, no permit.
• CF-2R — Certificate of Installation. Signed by the installing contractor — us, on our projects — certifying the equipment actually installed matches what the CF-1R specifies. Model numbers matter here. If the CF-1R says a 16 SEER2 heat pump and the installer puts in a 14 SEER2 unit because it was in stock, the CF-2R does not match and the final inspection stalls.
• CF-3R — Certificate of Verification. Completed by an independent third-party HERS rater who tests and verifies the installation. The rater cannot be the contractor. This independence is the point.

The failure mode we see most: the equipment gets swapped mid-project — supply house is out of the specified unit, something equivalent goes in — and nobody updates the CF-1R. The HERS rater shows up, the model numbers do not match, and the project sits while the energy consultant revises the report. Lock equipment selections before the CF-1R is filed, and treat any swap as a formal revision, not a field decision.

HERS Verification: The Testing Nobody Warns You About

HERS stands for Home Energy Rating System, and the rater is a certified third party who shows up with calibrated equipment and tests what was installed. On San Diego remodels, the tests we encounter most are:

• Duct leakage testing. The rater pressurizes the duct system and measures leakage. Old San Diego homes — especially 1960s–1980s builds in Clairemont, Del Cerro, and East County — routinely fail with original ducts. Leaky ducts are the number one HERS failure we see.
• Refrigerant charge verification. The rater verifies the system holds the correct refrigerant charge per manufacturer specs. This is a standard failure point on rushed changeouts.
• Airflow and fan watt draw. Verifies the system moves the designed CFM without excessive fan energy.

What it costs: $400 to $800 per HERS visit in San Diego County, and budget for the possibility of two visits. If the first test fails — and on older homes with original ducts, assume it might — you fix the deficiency and the rater comes back. The retest is not free.

Scheduling reality: good HERS raters in San Diego book out 1 to 2 weeks. Do not discover you need one the week of final inspection. Your contractor should have the rater scheduled when mechanical rough-in is wrapping up, not when the inspector is already asking for the CF-3R.

Before any of this starts, it is worth knowing where your home sits: most coastal San Diego neighborhoods fall in CEC Climate Zone 7, while inland valleys run Zone 10. The zone changes several prescriptive requirements, including cool-roof triggers — your energy consultant handles this, but if your report lists the wrong zone, the whole report is wrong.

The Mandatory Upgrades That Surprise Homeowners

These are the upgrades Title 24 forces most often on San Diego remodels, ranked by how blindsided homeowners tend to be:

1. Duct sealing or full duct replacement

The most common surprise, and the most common HERS failure. Sealing accessible ducts with mastic and retesting is the cheap path. But in older homes where ducts run through unconditioned attics and are falling apart, the rater’s test forces a real conversation: full duct replacement runs $3,000 to $7,000 depending on system size and access. If your home still has its original 1970s ducts, budget for this before the rater tells you to.

2. Higher-efficiency HVAC equipment

Minimum efficiency ratings keep climbing. A basic 14 SEER2 condenser that was fine a few years ago may no longer clear the bar, pushing you into 15–16 SEER2 territory or a heat pump. Equipment step-ups add $1,500 to $4,000 over the budget option. And under the 2025 code, additions are pushed harder toward heat pump space heating — if your addition was designed around a gas furnace, expect that conversation with your designer.

3. Cool roof or added insulation on re-roofs

Tear off the roof in many San Diego zones and the code wants a cool roof — a reflective roofing product — or compensating insulation. Cool-roof-rated shingles and tile cost modestly more than standard, but on flat and low-slope roofs the product choice genuinely changes. Material premium is typically $1,000 to $3,000 on a standard re-roof.

4. High-efficacy lighting and controls

Altered lighting must be high-efficacy (JA8-compliant fixtures, essentially quality LEDs) with vacancy sensors or dimmers in the altered spaces. Per-fixture cost is small, but a whole-house lighting alteration across a large remodel adds $800 to $2,500 in fixtures and controls.

5. Water heating efficiency

Water heater swaps must meet current efficiency standards. Moving from a standard tank to a heat pump water heater — increasingly the path of least resistance under the 2025 code — runs $2,500 to $5,000 installed versus $1,500 to $2,500 for a conventional high-efficiency tank. Check your electrical panel capacity first; heat pump water heaters need a dedicated circuit, and older 100-amp panels in San Diego bungalows are already full.

What Title 24 Really Costs on a 2026 San Diego Remodel

Here is the honest math, from projects we have actually built:

The realistic bands: $2,000 to $5,000 for a straightforward triggered scope where the report is done right the first time and everything passes. $8,000 to $15,000+ when ducts fail, equipment steps up, or the report has to be revised mid-project. The paperwork is never the expensive part — the equipment the paperwork forces you to install is.

These numbers sit inside the broader 2026 cost picture — see 2026 San Diego remodeling trends and costs for how energy requirements are shifting overall budgets this year.

How to Keep Title 24 From Blowing Up Your Budget and Timeline

After hundreds of permitted projects, the pattern is consistent. The homeowners who get hurt are not the ones with big scopes — they are the ones who find out late. Five rules:

1. Get the Title 24 report before plans are final, not during plan check. The CF-1R should be in the submittal package on day one. It costs the same either way, but doing it upfront eliminates the most common correction cycle in San Diego residential plan check.
2. Assume your ducts will be a conversation. If your home is more than 25 years old and the ducts are original, get a duct assessment during design. Finding out at HERS testing means opening finished walls or ceilings.
3. Lock equipment model numbers in writing. The CF-1R, the CF-2R, and the HERS rater all need to agree. Any substitution — even "equivalent" — goes back through the energy consultant first. On HVAC installations, this discipline is the difference between passing final inspection and a two-week stall.
4. Schedule the HERS rater early. Book the rater when mechanical rough-in is wrapping, not when the inspector asks for the CF-3R. In San Diego’s busy seasons, raters book 1–2 weeks out.
5. Work with a contractor who has done this before. Title 24 is a coordination problem more than a technical one — designer, energy consultant, installer, and rater all have to agree. A design-build contractor who owns the whole chain catches the mismatches before they cost you. That is how we run it: one team from design through permit to final inspection.

Title 24 is not the enemy. It is a set of rules that rewards planning and punishes improvisation — which, frankly, describes most of construction. Get the report done early, keep your equipment selections locked, test your ducts before the walls close, and the energy code becomes a line item instead of a crisis.

DRAFT NOTE: staged 2026-10-04 by worker-5 as replacement for quarantined premium_blog_generator.py output. Not published. Awaiting review before going live.