MA Condo Re-Siding: Rules, Votes, and Cost Splits

In a Massachusetts condominium, the exterior siding is not your wall. Under Chapter 183A, the main walls, party walls, and roof are common areas of the association, so a unit owner cannot legally re-side their side of a triple-decker on their own. The trust has to authorize the job, pay for it out of common funds, and split the cost among unit owners by percentage of undivided interest. Whether a supermajority vote is required depends on one question: is this like-for-like maintenance, or is it an improvement?

That distinction, between routine replacement under § 6 and an "improvement" under § 18, is the whole game. Get it wrong and the trustees can end up personally liable for an assessment the owners never approved.

The short answer

• The exterior siding on a Massachusetts condo is a common area under M.G.L. c. 183A, § 1, along with the roof, foundation, and structural walls. It is not part of the unit.
• A single unit owner cannot re-side their part of a triple-decker without trust authorization. The wall isn't theirs to hire on.
• Like-for-like re-siding (vinyl replaced with vinyl of similar spec) is normal maintenance and replacement of a common area under § 6, funded through the common expense budget or a special assessment. No formal owner vote is required beyond what the master deed or bylaws demand.
• An improvement (going from vinyl to fiber cement, adding rigid foam, adding a rain screen) triggers § 18. 50 to 74 percent approval means only the yes-voters pay. 75 percent or more approval means everyone pays as a common expense. If the improvement exceeds 10 percent of the condo's value, dissenting owners may petition the Superior Court for a buyout.
• Costs split by percentage of undivided interest in the master deed, not by "which wall is closest to me."
• If the re-side is triggered by wind damage, the association's master policy (not any owner's HO-6) is the payer.

Why your siding is not really your siding

Section 1 of Chapter 183A defines common areas to include "the foundations, columns, girders, beams, supports, party walls, common walls, main walls, roofs, halls, corridors, lobbies, public stairs and stairways, fire escapes and entrances and exits of the building." Siding sits on the main walls; the master deed for essentially every MA triple-decker or garden-style condo puts it explicitly on the common-area side of the line.

That's the legal reality. The practical one is: even in a three-unit trust where each owner "gets" a floor, no one owner has authority over the exterior envelope. If you sink $18,000 of your own money into re-siding the west elevation because the shingles on your side look rotten, you have (a) done work you weren't authorized to do on someone else's property, (b) probably no recourse to be reimbursed by the trust, and (c) possibly created a §18 problem if you upgraded the material.

Master deeds sometimes carve out "limited common areas" (a private deck, a storage locker) that are appurtenant to one unit. Siding is almost never limited common area. Check your master deed and the schedule of common and limited common areas before assuming anything.

Repair vs improvement, the § 6 / § 18 fork

This is where trustees get in trouble. Chapter 183A treats them as two different things:

§ 6 territory (routine maintenance and replacement). Section 1 defines "common expenses" to include "the expenses of administration, maintenance, repair or replacement of the common areas and facilities." Section 6 lets the trustees assess those expenses to all units under the annually adopted budget, by percentage of undivided interest or by an alternative formula in the master deed. No owner vote is required beyond what your bylaws separately impose (many small MA trusts require a trustee vote for capital items over a set dollar threshold; some require an informational owner meeting; none of that is 183A, it's your master deed and bylaws).

Like-for-like re-siding, the same profile of vinyl coming off, similar-spec vinyl going back, falls squarely in § 6. Same for a cedar-shingle re-side that restores the original look, or a fiber cement replacement if the previous siding was already fiber cement.

§ 18 territory (improvements). Once you're upgrading the building beyond its prior condition (vinyl to fiber cement, adding continuous exterior rigid foam over the sheathing, adding a rain screen and new trim package), you're in improvement territory. § 18 sets two hard vote thresholds:

• 50 to 74 percent approval, and only the owners who agreed pay for it. That's rare in practice; you can't run a wall re-side where half the owners are participating and half aren't.
• 75 percent or more approval, and the cost is assessed to every unit as a common expense.
• If the total cost of the improvement exceeds 10 percent of the condominium's value, any dissenting owner may petition the Superior Court to have their unit purchased by the association at fair market value.

The 10 percent rule matters more in a small triple-decker than it looks. On a $900,000 three-unit conversion, a $95,000 full re-side plus rigid foam and new windows can easily cross the threshold and hand a dissenter a legal exit valve.

Repair vs improvement decision table

Work	Category	Who authorizes	Who pays
Replace vinyl with same-spec vinyl	Repair, § 6	Trustees, under annual budget or special assessment	All units by undivided-interest percentage
Re-side one storm-damaged elevation with matching material	Repair, § 6	Trustees	All units, insurance pays most (master policy)
Vinyl to fiber cement, same trim package	Improvement, § 18	75%+ owner vote for building-wide assessment	All units if 75%+ approves
Add exterior continuous insulation (rigid foam) over sheathing	Improvement, § 18	75%+ owner vote	All units if 75%+ approves
Add rain screen furring + upgraded trim/flashing	Improvement, § 18	75%+ owner vote	All units if 75%+ approves
Repair a limited common area (e.g., a unit's private balcony)	Repair, § 6 with limited-common rule	Trustees	Only the appurtenant unit, if master deed says so

The gray zone is "restoration to functional equivalent." A trust that repairs the WRB and flashing during a like-for-like re-side is arguably still in § 6, because the WRB is part of maintaining the existing wall assembly. A trust that adds a full rain screen where none existed is not. Get your association's counsel to sign off in writing before the RFP goes out, especially if the vote will be close.

How the money actually gets raised

Chapter 183A, § 6 gives the trustees three levers:

1. Reserve fund. Well-run associations budget a replacement reserve line every year. Fannie Mae's Selling Guide requires at least 10 percent of annual budgeted assessment income to be allocated to replacement reserves for a condo project to be "warrantable" for conventional lending. Most small MA triple-decker trusts run under 10 percent, which is one reason they end up cornered when the siding fails.
2. Special assessment. A one-time charge on top of the regular common fee, spread over the units by undivided-interest percentage. On a typical three-unit trust with roughly equal percentages, a $60,000 re-side means each unit owner owes about $20,000. On a six-unit trust where one bigger unit carries 30 percent and the others carry 14 percent each, that shifts accordingly. The master deed is the schedule; it's not negotiable at the meeting.
3. Trust-level financing. Larger MA associations can borrow at the trust level against the assessment stream. Most triple-decker trusts are too small for a bank to write. In practice, owners fund a special assessment out of pocket, from a home equity line on their own unit, or occasionally through a Mass Save HEAT Loan if the work qualifies (weatherization insulation work often does; siding by itself typically does not). Ask the association's lender or Mass Save directly before assuming eligibility.

Lien risk. Under § 6, unpaid common expense assessments become a lien on the unit "from the time the assessment becomes due." The association's lien has priority over most subsequent mortgages. Owners who cannot pay a big special assessment are not a paperwork problem; they are a foreclosure problem, and every small MA trust that has tried to re-side has learned this.

Storm damage: the master policy, not your HO-6

If a nor'easter takes off six courses of vinyl from the east elevation, this is a master policy claim, not an HO-6 claim. The master policy insures the building itself (roofs, exteriors, structural walls) and its named perils, typically including wind. The trustees or the property manager file it. HO-6, the individual unit owner policy, covers unit interior finishes and personal property; it is not the payer for a siding loss.

The mechanics of MA wind claims (percentage deductibles, matching arguments, the two-year § 99 clock) apply to condo master policies the same way they apply to single-family policies. Our wind-damage siding insurance claims guide walks the sequence for a single-family homeowner and most of it maps directly to a condo trust; the difference is that the trust, not the owner, is the insured.

Two condo-specific notes:

• Deductible split. Some master deeds require unit owners to reimburse the trust for their share of the master policy deductible after a covered loss. That reimbursement is typically split by undivided-interest percentage.
• Loss assessment coverage. A well-written HO-6 policy carries "loss assessment" coverage (often $1,000 to $50,000, depending on the endorsement) that helps a unit owner pay their share of a special assessment triggered by a covered loss. If your HO-6 was written on the cheapest possible form, you may have $1,000 or nothing here. Look at your declarations page now, not after the storm.

If the master is placed with the FAIR Plan (MPIUA), the Massachusetts residual property market, the coverage is real but bare-bones: named-peril commercial property forms, hurricane deductibles that often run 2 to 5 percent of the building limit on coastal condos, and no frills. Many older triple-decker trusts sit on FAIR Plan because the voluntary market has walked away.

Triple-decker realities

Most MA condos this article is aimed at are two-to-six-unit conversions of an older triple-decker or a two-family, in Somerville, Dorchester, JP, East Boston, Cambridgeport, Chelsea, Worcester, Lowell, Lynn, or a dozen other neighborhoods with a lot of turn-of-the-century wood-frame housing stock. A few realities the property-manager blogs don't cover:

• No property manager. Small trusts self-manage. That means one of the owners is the treasurer, another is the secretary, and everyone is a trustee. Getting a real re-side authorized means one of you actually writes the RFP, verifies HIC and CSL licenses, and walks the bids with the contractor.
• Original siding is often asbestos or lead-painted wood. Anything built pre-1978 needs the Massachusetts Lead Law RRP protocol; asbestos siding (transite or cementitious shingle) needs a MassDEP notification and a licensed abatement contractor. Our asbestos and lead in older Massachusetts siding guide covers testing and abatement; the what contractors find removing old siding guide is the closest neighbor on the surprise-scope side. Budget for it. The abatement scope is a common expense of the trust, not the individual owner's problem.
• Historic districts and zoning. Many triple-decker neighborhoods sit in a Local Historic District or a Neighborhood Conservation District. Changing siding material or color usually requires a Certificate of Appropriateness from the local historic district commission before the trustees can even sign a contractor. See our MA siding permits and historic district guide for how those approvals sequence with the building permit.
• Owner-occupant vs investor split. In many triple-decker trusts, one unit is owner-occupied and two are rentals held by a resident landlord or an out-of-state investor. Investors sometimes vote against improvements because the pass-through to rents is slow. Trustees planning a § 18 improvement need to talk to those owners early, or the 75 percent threshold won't clear.

What the process actually looks like, step by step

1. Read the master deed and bylaws. Confirm the schedule of common areas (does siding appear anywhere in a limited-common exception?), the vote thresholds your bylaws impose on top of 183A, and the trustees' capital-item authority.
2. Scope the damage honestly. Walk the building with a contractor whose HIC and CSL you have verified on the state's licensee lookup. Get a written scope: which elevations, WRB condition, flashing condition, any sheathing rot.
3. Decide the archetype. Like-for-like repair (§ 6, trustee-authorized under budget) or improvement (§ 18, owner vote required). If it's close, get counsel.
4. Get two to three bids. Apples-to-apples: same scope, same product spec, same WRB replacement scope, same debris haul, same warranty. Our MA siding replacement cost guide has the current dollar ranges.
5. Draft the assessment resolution and, if § 18, the vote package. For § 18, the notice should describe the improvement, the total cost, the assessment amount per unit, the payment schedule, and the vote threshold being sought (50 to 74 percent for opt-in, or 75 percent or more for full common expense). Include the § 18 dissenter-buyout language if the total cost is close to 10 percent of the condo's value; not disclosing it is trustee malpractice.
6. Hold the meeting. Record the vote in writing. Circulate the minutes.
7. Sign the contract in the name of the trust, not any individual owner. HIC contracts over $1,000 for residential work are governed by M.G.L. c. 142A regardless.
8. Bill the assessment on the schedule the resolution set. Track payment. Move promptly on a lien if any unit falls behind, because the lien priority under § 6 is what makes the trust whole.
9. On completion, issue certificates to owners confirming the assessment was paid in full for their unit. This matters at resale.

A clean condo re-side, from decision meeting to final walk-through, runs roughly four to nine months on a small trust that has its financing in place. A trust that has to raise the money from scratch and vote a § 18 improvement can easily run 12 to 18 months, which is why most stall over the winter and never actually break ground.

FAQ

Can I re-side my part of a triple-decker condo on my own? No. Under M.G.L. c. 183A, § 1, the main walls of the building are common area of the condominium. The exterior is not part of your unit, so you cannot lawfully hire a contractor to re-side "your" wall. The trust has to authorize and pay for the work.

Do all unit owners have to vote to re-side the building? Not for like-for-like repair or replacement. Under § 6, that's a normal common expense the trustees can assess through the budget or a special assessment. An owner vote is required under § 18 only for improvements: changing materials, adding continuous insulation, adding a rain screen, or anything that upgrades the building beyond its previous condition.

How is the cost split among unit owners? By each unit's percentage of undivided interest in the common areas, as set in the master deed. That's a fixed schedule, not negotiable at the meeting. Some master deeds use unit area or an alternative formula; check yours.

What happens if one owner refuses to pay their share of a re-siding special assessment? Under § 6, the association has an automatic lien on that unit from the time the assessment becomes due. The lien has priority over most subsequent mortgages, so the trust can force payment through a lien foreclosure. In practice, trustees usually get paid once the lien is recorded, because the mortgage lender does not want the priority contest.

Does the master policy or my HO-6 pay for storm damage to the siding? The master policy pays for the exterior of the building. Your HO-6 covers your unit interior finishes and personal property, plus any loss-assessment coverage on the policy that helps you fund your share of the master deductible or a related special assessment. Look at the loss-assessment limit on your HO-6 declarations page.

Get bids from MA siding contractors who understand condo trusts

Once the trust has authorized the work and the funding path is set, the next move is real bids from Massachusetts siding contractors who have actually worked a condo scope. They know how to write an estimate the trustees can circulate to owners, they sequence material staging on a tight urban lot, and they carry the right liability limits to name the association as an additional insured.

Get matched with vetted MA siding contractors via /get-estimate. Tell us the trade (siding), the town, whether the property is a condo, and roughly how many units, and we'll route the request to contractors who handle association work. For material and dollar reality-checks before the bid meeting, our MA siding replacement cost guide and the Massachusetts siding hub are the starting points.