Roof Repair or Replacement: How to Decide in Los Angeles

The signs that point to a repair

• One leak with one obvious cause: a cracked pipe boot, a lifted flashing at the chimney, a vent that was never sealed, a tile broken by foot traffic.
• Wind damage confined to one slope or one area: lifted or missing shingle tabs after a Santa Ana event, with the surrounding shingles still flexible.
• A roof in the first half of its life: a shingle roof under about 15 years, a tile roof whose underlayment is sound, a metal roof with a loose seam.
• Damage that covers well under half the roof. A repair that stays small stays a repair in the eyes of the code.

The signs that point to a replacement

• Leaks that recur in different places, which means the field of the roof, not one detail, has failed.
• Asphalt shingles that are brittle, curling or bald: the granules in the gutters are the roof leaving.
• A tile roof whose underlayment has rotted: the tiles look fine from the street while water runs under them.
• Sagging or soft sheathing, daylight in the attic, or a roof with more than one layer already on it.
• A repair that would cover more than half the roof within a year, which in Los Angeles means the whole roof has to come up to current code anyway.
• A roof at or past its typical life: 20–30 years for shingle, 20–30 years for tile underlayment, 40–70 for metal.

Repair vs. replacement at a glance

The 50 percent rule, exactly as LADBS states it

LADBS Information Bulletin P/BC 2023-013 sets the rule for the City of Los Angeles: if more than 50 percent of an existing roof is re-roofed within any one-year period, the entire roof must comply with current code; if 50 percent or less is replaced within a year, only the area replaced must comply. Current code means a Class A, B or C covering under the Building Code, Class A in a Very High Fire Hazard Severity Zone, and the removal of any wood shakes or shingles. The cool-roof requirement of the 2025 Energy Code uses the same trigger: more than half of a single-family roof replaced means a rated cool-roof product on the steep-slope roofs of Climate Zone 9, which is the whole Valley, unless an attic exception applies. Burbank, Glendale and Beverly Hills apply the state codes through their own building departments.

The practical effect is that a large "repair" is a replacement in disguise. Re-roof 60 percent of a roof this year and the other 40 percent has to be brought up to code too, with a rated covering and, in a fire zone, Class A throughout. We tell you where the line is before you choose.

What the 25 percent rule is, and why it does not apply here

The "25 percent rule" that comes up online was a Florida Building Code provision, repealed there in 2022, that required replacing a whole roof when more than a quarter of it was repaired within a year. It never applied in California. The Los Angeles rule is the 50 percent rule above, and the only other threshold that matters here is the cool-roof trigger, which uses the same 50 percent line.

Permits, inspections and the fire zone

Replacing a roof in the City of Los Angeles needs a permit from LADBS, usually an express permit for a Class A or B covering over solid sheathing, with the deck inspected before the new covering goes on and the finished roof inspected at the end. Small repairs can fall under the work exempt from permit, but anything that replaces a section of roof is permitted, and the permit is what records the fire rating and the rated cool-roof product for the parcel. In a Very High Fire Hazard Severity Zone, which takes in the hillsides south of Ventura Boulevard, the Hollywood Hills and Granada Hills north of Rinaldi Street, the covering has to be Class A even for a partial replacement; the tile vs. shingle vs. metal guide compares the materials that qualify.

Insurance and the age of the roof

Carriers treat the two cases differently. Sudden damage, wind, a fallen limb, a fire, is usually a covered repair; wear and age are not, and many insurers now ask for a roof inspection at renewal, limit coverage to the roof's depreciated value, or decline to renew once a shingle roof passes an age threshold, often somewhere around 15–20 years. Before you decide between a repair and a replacement on an older roof, ask your carrier in writing what it will cover and what it expects; a permitted replacement usually resets the question and can lower the premium conversation. Nothing here is insurance advice; your policy and your carrier decide.

Can you roof over the old roof?

Sometimes, and rarely well. The code allows a new covering over one existing layer of asphalt shingles in some cases, never over wood shakes, tile or more than one existing layer, and never over a soaked or rotten deck. An overlay hides the sheathing you most need to see, adds weight and shortens the new roof's life, so on a Valley house we tear off to the deck, repair the sheathing, lay new underlayment and flashings and install the rated covering. The tear-off is also what lets the deck inspection happen.

What we recommend

Have the roof inspected and ask two questions: how old is it, and how much of it is the problem? An isolated leak on a roof in the first half of its life is a repair, done with matching material and a Class A product in a fire zone. Recurring leaks, a failed underlayment, brittle shingles or a problem that covers more than half the roof is a replacement, permitted, inspected, rated for fire and for the cool-roof rule, and warranted as a new roof. The free estimate tells you which one you have, in writing; see roofing and the roofing section of our FAQ.

Sources (checked October 2026): LADBS Information Bulletin P/BC 2023-013, Roofing Requirements for Wood Shakes and Shingles (re-roofing more than 50 % of an existing roof within one year brings the entire roof to current code; Class A in a Very High Fire Hazard Severity Zone); California Energy Commission, Building Energy Efficiency Standards (Title 24, Part 6): residential lighting, ventilation and envelope requirements in remodels; CAL FIRE Office of the State Fire Marshal: Fire Hazard Severity Zone maps; Los Angeles Department of Building and Safety, plan check and permit information; Right Image Builders service and neighborhood pages (2026 planning ranges, timelines, permit authorities). Cost figures are Right Image Builders' 2026 planning ranges from its service and neighborhood pages.