Cambridge Deck, Roof, Solar, and Trade Permit Guide

Cambridge publishes building, roof, siding, solar, electrical, plumbing, gas, and mechanical permit paths, plus FAQ guidance for deck guardrails, roof layers, and sheds.

Permit takeaway

Cambridge building permit applications include new construction, addition or alteration, roof, siding, solar, and other categories, while electrical, plumbing, and gas permits use separate permit paths.

Zoning and placement

Decks, roof decks, windows, doors, skylights, exterior stairs, and covered porch enclosures can require plot plans, dimensional plans, elevations, zoning documentation, and historic review.

Building and trade review

Cambridge FAQ notes that decks more than 30 inches above grade need guardrails and that only one layer of roofing may remain when re-roofing.

Call before applying when

Call before applying if the project includes a deck, roof deck, roof replacement, solar, siding, electric, plumbing, gas, HVAC, shed over 120 square feet, or exterior changes on a protected structure.

Documents to prepare

• Correct permit application type
• Plans and elevations if required
• Plot plan if required
• Equipment or trade details

Inspection planning

• Submit online permit
• Coordinate building and trade inspections
• Do not advance work until required utility signoffs are complete
• Keep permit card onsite

Official sources

• Cambridge Building Permit Applications
• Cambridge Building, Electric, Plumbing Permits
• Cambridge Frequently Asked Questions

This guide is a planning summary. Always verify the current requirements with the local office before starting work.