What MA Law Allows for DIY
Per 248 CMR (plumbing) + 527 CMR (electrical) + 780 CMR (building):
DIY-Permissible (No Permit Required)
- Cosmetic refresh in same footprint: paint, wallpaper, tile-on-tile (existing prepared surface), beadboard install
- Like-for-like fixture replacement (toilet, faucet, light fixture in existing location)
- Vanity replacement (in same plumbing location)
NOT DIY-Permissible (Permit + Licensed Required)
- Plumbing fixture relocation (toilet, sink, shower)
- New plumbing fixtures
- Any electrical: new circuits, GFCI/AFCI changes, lighting additions
- Heated floor wiring
- Structural changes (wall removal)
- Window or skylight changes
Frequently Asked Questions
Can I do my own tile work?
Yes — tile installation itself doesn't require a permit. BUT: removing old tile may expose plumbing or electrical that does. Pro Build sees many DIY tile projects derail when 'simple' tile work uncovers needed plumbing/electrical updates.
What about owner-builder permits?
MA allows owner-builder permits for owner-occupied homes. Owner accepts full liability. Pro Build doesn't recommend owner-builder for bathroom scopes — coordination + liability + resale documentation favor licensed contractor.
References & Sources
- Massachusetts State Building Code 780 CMR. https://www.mass.gov/the-massachusetts-state-building-code-780-cmr
- 248 CMR Massachusetts Plumbing Code. https://www.mass.gov/regulations/248-CMR-massachusetts-plumbing-and-fuel-gas-code
