Condo Renovation in Boston: Do You Need Permission to Renovate?

A condo renovation in Boston starts with your documents, not your contractor. Under Massachusetts law you own your unit, but you also agreed to the master deed, bylaws and rules, and those decide what you can change and who has to sign off.

So the short answer to "do you need permission to renovate a condo?" is: for painting and new furniture, usually not. For walls, plumbing, floors, windows or anything structural, almost always yes, from the board and from the city. Here's how it works in Boston, Somerville and Cambridge.

Can you renovate a condo in Massachusetts?

Yes, within the limits your condo documents set. Massachusetts condos are governed by Chapter 183A:

• Section 4: each owner must comply with the bylaws, the rules and regulations, and the restrictions in the master deed (M.G.L. c.183A §4).
• Section 8: the master deed describes the units and the common areas and includes floor plans and any use restrictions (§8).
• Section 11: the bylaws must include restrictions on the use and maintenance of units and common areas, meant to prevent unreasonable interference with other owners (§11).
• Section 5: no work that would jeopardize the soundness or safety of the building can be done in a unit or common area unless all unit owners consent first (§5).

Read your master deed's unit description closely. It usually says where your unit ends, for example at the inside face of the walls, which tells you what is yours and what is common area.

What usually needs board approval

Every association is different, but in Greater Boston condos these items almost always go to the board:

• Structural changes: removing or opening walls, cutting joists, new beams. In a converted triple-decker, plenty of "interior" walls carry the floor above.
• Plumbing risers and shared lines: moving a kitchen or bath often means tying into a stack that serves every unit.
• Flooring: many bylaws set sound rules for hard floors, such as an approved underlayment.
• Windows, doors, porches and exterior walls: these are often common area, even when only you use them.
• Mechanical: new heat pump condensers, dryer vents or exhaust fans through exterior walls.
• Electrical service and meter changes.

Permits for a condo renovation in Boston, Somerville and Cambridge

• Boston: if you own a unit in a building with three or more dwellings, you must hire a licensed contractor to do the work. Structural changes need a Long-Form permit (boston.gov).
• Somerville: a building permit is required for all interior and exterior work except painting, tiling and flooring, and buildings with three or more units need a licensed contractor to pull it (Somerville ISD). See my Somerville permit guide.
• Cambridge: the permit must be issued before any work starts and posted on site; ordinary repairs are exempt, and ISD issues or denies within 30 days of payment processing (cambridgema.gov).

Most condo buildings around Davis Square, Porter Square and East Somerville were built before 1978. Paid work there that disturbs more than 6 square feet of painted surface per room inside needs a licensed lead-safe renovation contractor (mass.gov).

Paperwork the board asks for

From my experience, a smooth approval package includes:

1. A written scope of work and simple drawings.
2. The contractor's license and HIC registration numbers, plus lead-safe licensing for older buildings.
3. A schedule with work days, hours and loud phases.
4. Copies of permits once issued.
5. Any other paperwork the board asks for under its alteration policy, and a signed alteration agreement if it has one.

My contractor hiring checklist covers how to verify licenses.

Work hours and noise

Your association can set tighter hours than the city, so check the rules too.

How much does it cost to renovate a condo?

For reference, the 2025 Cost vs. Value report (Boston) lists a midrange minor kitchen remodel at $28,991, a midrange major kitchen at $84,331 and a midrange bath at $27,681. Condo work adds its own costs: protecting shared halls, carrying materials up stairs, shorter work days and tight parking. Every unit is different, so I give a written line-item budget after a free walkthrough.

Planning around neighbors

• Introduce yourself and share the schedule before demo day.
• Bunch the loud work (demo, tile cutting) into announced blocks.
• Protect and clean common halls daily.
• Give one phone number for questions.

Need a hand?

Planning a condo renovation in Somerville, Cambridge or Boston? Book a free walkthrough. I'll review what your board will want to see and send 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 →