Triple Decker Restoration in Boston: One Building, Three Units, One Team

Why Is Triple Decker Restoration a Different Job From Single-Family Work?

Triple decker restoration, also searched as three family home restoration, is the mitigation, cleanup, and rebuild of Boston’s classic three-family homes, handled as one structure with three households inside it. The building is restored as a whole, because its framing, plumbing, and roof are shared, while the claim is managed unit by unit, because the policies are not. Getting both halves right is the entire specialty.

These buildings went up by the thousands between the 1880s and the 1920s across Dorchester, Roxbury, Mattapan, and Hyde Park, built to a pattern: three stacked flats, a common front stair, a rear porch system, and one vertical run of pipes feeding three kitchens and three baths. Consequently, a failure anywhere in that frame becomes a building-wide event within hours, and a crew that treats a triple-decker like a large colonial dries the unit it can see and misses the two it cannot.

There is also a human layout to manage. Most of these buildings are owner-occupied on one floor with tenants above or below, so the person filing the claim is often living inside the loss. Therefore our first hour on site covers all three units, and our documentation separates building damage from unit damage from the start.

Studio 24 Restoration Group staffs this work with triple decker contractors who know the stock: where the chases run, how the cavities connect, and which walls still hide knob-and-tube. As a result, three family home restoration here starts with the building’s anatomy.

One Loss, Three Units: How Do Triple Decker Insurance Claims Actually Work?

One loss in a triple-decker can trigger up to four claims: the building owner’s policy for the structure, and a renters policy in each tenant unit for that household’s belongings and displacement costs. The structure, from framing and plaster to the roof and common stairs, belongs on the owner’s claim; each tenant’s furniture, clothing, and hotel receipts belong on that tenant’s own policy. This is general guidance and policy language varies, but the division of labor is consistent enough to plan around.

Who documents what decides who gets paid. The owner needs a building scope, each tenant needs a contents inventory, and everyone needs the cause of loss established once, professionally, before the evidence is disturbed. Studio 24 builds that file as one package: unit-by-unit moisture maps, photos keyed to floors, and an Xactimate scope that separates building line items from contents so four adjusters can each find their piece. Additionally, our insurance claims team coordinates the carriers so the owner is not translating between three households and four claim numbers alone.

The owner-occupant landlord carries the strangest version of this: claimant for the structure, landlord for the families upstairs, and sometimes a displaced resident, all in the same week. Studio 24 was founded by Ansy Chevalier, an IICRC certified restorer, cert #70268689, who meets adjusters at the building personally. As Ansy puts it, “In a triple decker, the unit you can see is never the whole loss. We meter all three floors because the building is one structure wearing three addresses.”

Here is the pattern that proves the point. A supply line lets go on the third floor on a February night, the kind of freeze the January 2018 cold snap produced citywide, and by morning the building holds three losses that need three files.

Notice where the fight usually happens: the middle unit. An adjuster sees a wet third floor and a stained first-floor ceiling, and the second floor reads as fine because its damage is inside the walls. Unless cavity readings enter the file early, that saturation gets discovered months later as mold, and the coverage argument starts. Documenting the middle unit on day one is the highest-value hour in a triple-decker claim.

Triple Decker Water Damage in Boston and the Middle Unit Problem

Triple decker water damage behaves vertically. Whatever escapes on an upper floor rides the open stud bays and the plumbing chase downward, wetting plaster from behind on every level it passes. The source unit shows the mess, the bottom unit shows the stains, and the middle unit hides its share inside the walls, which is why it needs metering before it needs paint.

The winter version is the one we run most. Freeze-thaw cycles split pipes in the uninsulated back hallways and unheated basements these buildings were born with, and a single cold snap fills our board from Dorchester to Hyde Park overnight. When that happens in a three-family, our burst pipe damage crews extract in every affected unit the same night, then open the base of each wet stud bay so the cavity can actually dry. Afterward, the loss folds into the full water damage restoration process: metered drying to IICRC S500 targets, logged daily, unit by unit.

Left undocumented, hidden cavity moisture has a second act. The EPA notes mold can begin growing on damp materials within 24 to 48 hours, and a saturated bay behind sound-looking plaster is a textbook starting point. However, if a musty odor is already climbing the back stairs, our mold remediation team scopes the cavities under S520 containment instead.

Multi-Family Restoration Services: Rebuilding Three Units Under One Roof

The rebuild is where a triple-decker either comes back as the building it was or comes back as three mismatched apartments. Finishes have to carry across units: the stair hall trim, the five-panel doors, the plaster walls with their original profiles. We record profiles from surviving rooms and reproduce them in the damaged ones, so the second-floor unit does not read as the renovated one when the owner re-rents it. Since the same team ran the mitigation, our reconstruction crews inherit the scope instead of rediscovering it, and the whole rebuild bills to the claim file that opened on day one.

Opening balloon-framed walls also triggers code obligations that single-family playbooks skip. Modern Massachusetts code requires fireblocking in concealed spaces, and the open bays that spread the original loss get blocked while they are exposed, which makes the building safer than it was before the fire or flood. Egress gets the same treatment: the rear porch and stair system is the second means of egress for all three units, so when it burns or rots it is rebuilt to current guard, rail, and stair geometry requirements, not patched back to 1905. Likewise, any knob-and-tube found live in an opened cavity is flagged for licensed replacement before insulation goes anywhere near it.

Then there is the lead. Nearly all of this housing stock predates 1978, so disturbing painted surfaces falls under the EPA Renovation, Repair and Painting rule, which requires certified firms and lead-safe practices, containment, and cleaning verification. That matters double in a building where two of the three households may include children, and we run every triple-decker rebuild to it as a baseline, not an upgrade.

One last thing worth saying plainly. A triple-decker is the reason many Boston families own property at all, and a mishandled loss can turn the building from an income into a liability in one season. Restored correctly, documented across all three units, and rebuilt to match itself, the same building comes back stronger than it stood before the loss. That is the whole job as we see it, and it is why multi-family restoration services are a specialty here rather than a line item. Last updated August 2026.