How long does it take to get a building permit? Somerville and Massachusetts timing

"How long does it take to get a building permit?" is one of the first things my Somerville clients ask, right after "how much?" The short answer: in Massachusetts the building official must act on your application within 30 days of filing, but that clock only helps you if the application is complete and needs no zoning or historic approval.

A clean, complete permit for interior work can move quickly. Anything that needs a zoning hearing, historic review or engineered plans takes longer. Below is how the rules work, what slows Somerville permits down, and how I keep my clients' projects moving.

The 30-day rule in the Massachusetts building code

Section 105.3.1 of the Massachusetts State Building Code, 780 CMR (10th edition) requires the building official to review your application and issue or deny the permit in writing within 30 days of filing. Here is what that means for you:

• A denial has to be in writing and give the reasons.
• If the official doesn't act in 30 days, the code points to a complaint or an appeal to the state Building Code Appeals Board.
• Under section 105.3.2, an application is treated as abandoned 180 days after filing unless you pursue it in good faith. You can ask in writing for extensions of up to 90 days each.

The catch: the 30 days covers the building permit only. Zoning relief and historic approvals run on their own schedules, and those usually have to be done before the building permit is issued.

What slows down a Somerville building permit

Somerville files building permits through the Citizenserve portal. In my experience, delays almost always come from one of these:

1. Incomplete applications. The Building Division lists required documents: the contractor's CSL, HIC registration for owner-occupied 1–4 unit homes, a signed contract, plans when required, Workplace Safety and Wage Theft affidavits, a Site Safety Plan and OSHA certification. If one is missing, you wait while it gets fixed.
2. Zoning review. The permit has to show your project meets zoning, including setbacks, frontage and yard size. Porches, decks, dormers and additions get the most attention. My Somerville zoning guide explains the basics.
3. Historic review. Work on a Local Historic District property, or demolishing a building 75 years or older, needs a separate Historic Permit in Citizenserve. That covers much of Somerville's 1900–1930 housing stock. See my guide to Somerville historic districts.
4. Engineering. Structural changes like removing bearing walls, new beams or big openings need drawings someone can review. If the plans don't match the existing framing, expect questions.
5. Trade permits. Electrical, plumbing and gas permits must be pulled by licensed trades. They run alongside the building permit, and one late trade can hold up the job.

How long does it take to get a building permit approved when you need a hearing?

If your project needs a special permit or a variance, state zoning law sets the outer limits:

Both deadlines can be extended by written agreement. And those days only start once you file, which comes after design and the city's intake. Once you get relief, you still go back to ISD for the building permit itself. That's why I tell clients that a project needing a hearing is measured in months, not weeks.

A typical Somerville permit sequence

1. Walkthrough, scope and existing-conditions measurements.
2. Zoning check: does the work fit by right, or does it need relief?
3. Historic check: is the property in a Local Historic District, or is anything being demolished?
4. Drawings, stamped by an architect or engineer if needed.
5. File a complete application in Citizenserve and pay the review fee.
6. Answer reviewer comments fast.
7. Permit issued and posted on site, then trade permits and inspections.

Want to see how busy the city is? My analysis of Somerville's 7,174 building permits from the last 12 months shows which project types are most common.

How long does it take to get a building permit for a deck?

Decks and porches are rarely slowed down by the carpentry. What slows them is zoning, since setbacks matter in Somerville's tight lots, plus footing and framing details. A rebuild that keeps the same footprint usually moves faster than a new or larger deck. If your porch is failing, read my porch and stair safety guide first.

How a contractor or owner's rep speeds it up

• Run the zoning and historic checks before design, not after.
• Submit a complete package the first time, with matching costs, plans and affidavits.
• Book the electrician and plumber early so their permits don't lag.
• Answer reviewer comments the same day.

That is a big part of what an owner's representative does.

Need a hand?

I pull permits regularly in Somerville, Cambridge, Medford and Greater Boston, and I build the permit timeline into every schedule. Book a free walkthrough and I'll send you a written line-item budget, usually within 48 hours.

About the author

Mateus Magno is the founder of Magno & Co — a licensed Massachusetts Construction Supervisor (CS-123658), registered Home Improvement Contractor (HIC #220484) and certified Lead-Safe Renovator Supervisor who has renovated and managed over $3 million in projects across Greater Boston.

More about Mateus →