Roof permits in San Jose: when you need one and how it works

The 25 percent rule

The city draws the line at 25 percent of the roof replaced within any 12-month period. Below that, the work is a repair: a leak fix, a few squares of shingle, a tile section relaid. At or above it, the work is a reroof and needs a permit, a final inspection and compliance with the current code for roofing.

The 12-month window matters. Two repairs of 15 percent each, six months apart, add up to a reroof in the city's eyes. If you are patching the same roof repeatedly, the permit question comes up sooner than you might expect.

Each structure is its own permit

A permit covers one structure. A detached garage, a studio or an accessory unit with its own roof needs its own permit if its re-roof passes the threshold. The exception is a single-family home and its detached garage, which can be re-roofed under one permit. For complexes with several buildings, that means one permit per building, which is worth knowing when planning an HOA project.

What the application asks for

Most reroof permits go through SJPermits.org. When a project needs Planning or Building review instead, the city asks for photos of the existing roof, the existing roofing material, the proposed product's manufacturer, style and color, and a completed reroof worksheet. The worksheet also asks for the minimum fire class required and the fire class of the new roof.

Homes in historic districts need Planning clearance first. There, the new roof should match the scale, color and texture of what was used historically, and the city notes that black and dark gray are generally not appropriate.

The code checks that come with a permit

A permitted re-roof has to meet today's code, not the code the house was built under. Three checks come up most. Title 24 sets cool-roof reflectance values for most permitted re-roofs, with full compliance triggered when more than half the roof is replaced in 12 months. Homes in mapped Fire Hazard Severity Zones need a Class A roof assembly. And if the new roofing pushes total weight above 7 pounds per square foot, the city requires an engineering analysis of the framing before the permit issues.

Our guides on Title 24 cool roofs and Class A roofs in fire zones cover the first two in detail.

What the permit costs and who should pull it

Published cost guides put San Jose reroof permit fees at roughly $400 to $800, and one calculator lists the county reroof permit at about $241 for unincorporated addresses. The contractor doing the work should file the permit, list the product and its ratings, and schedule the final inspection. An offer to skip the permit is a red flag: unpermitted work tends to surface at sale time, and it leaves you without the city's inspection of the job.

Our roof replacement scopes include the permit, and we attend the final.