Office-to-Apartment Conversion Drywall in Hartford, CT

Office-to-Apartment Conversion Drywall in Downtown Hartford

Downtown Hartford is turning its office towers into apartments. The insurance companies that built the skyline, The Hartford, Travelers, and Aetna, need far less floor space than they once did, and the Capital Region Development Authority has spent years financing the conversion of that obsolete office stock into downtown housing. Buildings like 777 Main Street, 100 Pearl Street, and 111 Pearl Street have already made the change from Business floors to apartments, and the pipeline around Pearl Street, Main Street, Constitution Plaza, and the Bushnell South district keeps adding units. For a drywall contractor, this is the largest repetitive interior-partition work in the city, and it is a different animal from an office tenant improvement.

An office-to-apartment conversion is a change of occupancy. The building was classified Business (B) and is becoming Residential (R-2), so the work is governed by the International Existing Building Code as adopted in the 2022 Connecticut State Building Code, not by new-construction rules alone. The existing concrete or steel structure stays, and everything inside it gets rebuilt to residential separation standards. The drywall scope is the walls that make one open floor plate into a corridor and a row of individual apartments: demising walls between units, corridor walls, shaft walls, and the fire and sound assemblies the code now demands between dwellings. It is high-volume, highly repetitive metal-stud framing and Level 4 finish, floor after floor, and the details that matter are the ones a plain office partition never has to meet.

Demising walls that carry a sound rating, not just a line on the plan

The wall between two apartments is a party wall, and the code holds it to a number. IBC Section 1206 requires a Sound Transmission Class of at least 50 (45 when field-tested) between dwelling units, and the floor-ceiling assemblies carry an Impact Insulation Class as well. A single layer of board on steel studs does not get there. Unit demising walls are built as rated assemblies: staggered or double steel studs, mineral wool in the cavity, double-layer 5/8 inch Type X gypsum, resilient channel or sound-isolation clips where the detail calls for them, and every edge sealed with acoustical sealant so the rating is not lost at the perimeter. The failure mode in a conversion is flanking, where sound travels around the wall through the floor slab, the window mullions, or an unsealed head-of-wall joint. Building the assembly to the tested detail, and closing it off at every edge, is what makes the STC number real when a tenant is on the other side.

Unit-to-unit and corridor fire separation, built to the listing

Residential occupancy changes the fire rating map of the floor. Party walls between units and the walls along the exit corridor become fire partitions under IBC Section 708, typically a one-hour rating (reduced where the building is fully sprinklered), and the vertical shafts for stairs, elevators, and mechanical chases require rated shaft-wall assemblies under Section 713. These are built to a specific UL listing, with the correct board type and layering, CH or CT studs and gypsum liner panels at the shaft walls, fire-stopping at every penetration, and a proper head-of-wall detail at the top of the partition. Because a conversion sits inside an existing structure, the top of a rated wall often meets a fluted metal deck or an irregular concrete underside, so the deflection and fire-stop detail at that joint has to be built and inspected before the wall is closed.

Working inside an existing shell at repetitive volume

The structure is a given, and it fights the framing. Floor-to-floor heights are set by the old office building, slabs are rarely flat or level, existing columns and spandrel beams land in the middle of new unit layouts, and window mullions dictate where a demising wall can die into the exterior wall. The productive way to run this work is to treat every floor as a repeat of the one below: the same wall types, the same rated assemblies, the same finish, laid out and stocked so crews move unit to unit and floor to floor without relearning the job. That is where a shop that understands the conversion earns its place, holding a Level 4 finish across hundreds of units on a developer’s and CRDA’s schedule, keeping the rated and sound assemblies correct at volume, and passing the corridor and unit-separation inspections the first time so the building can move toward lease-up.