Office-to-Apartment Conversions Are Won Behind the Walls
Turning older downtown buildings into housing sounds simple from the sidewalk. The structure is already there. The location is already serviced. The shell has a roof, walls, stairs, and utilities. But once the demolition starts, the real work begins. That is the practical lesson behind Farhi Holdings’ latest downtown London apartment conversion, reported by The London Free Press.
Developer Shmuel Farhi put it plainly. With a new build, the team knows what foundation, electrical, and mechanical systems are going in. With an older building, nobody knows the full condition until walls and ceilings are opened. That is where adaptive reuse projects either stay on track or start bleeding time and money.
For builders and renovators, the biggest issue is not whether an old office or commercial building can become apartments. Many can. The question is how much hidden work is required to make that building safe, code-compliant, efficient, and livable by today’s standards.
Older downtown buildings often carry layers of past renovations. One floor may have newer wiring, while another still has outdated service runs. Plumbing may not be located where kitchens and bathrooms now need to go. Mechanical systems that worked for offices may not suit individual apartments with different ventilation, heating, cooling, and hot water demands. Fire separations, alarms, exits, accessibility, and sprinkler requirements can also change once the use changes from commercial to residential.
That means the early budget is only as good as the investigation behind it. A proper conversion needs selective demolition, structural review, hazardous material checks, service capacity reviews, and a clear plan for fire and life safety upgrades. Skipping that work at the front end usually costs more later. Once trades are on site and occupancy deadlines are set, surprises become expensive.
In an old building, the most important construction work often starts after the first wall is opened.
There are good reasons cities and developers keep looking at these projects. Conversions can bring housing into areas that already have transit, sidewalks, sewers, hydro, and nearby services. They can also reuse embodied carbon already locked into the existing structure, instead of tearing everything down and starting from zero. For downtowns with vacant or underused commercial space, that matters.
But the construction path is not the same as building a new apartment block on a cleared site. Trades have to work around existing columns, floor heights, shafts, stairwells, and exterior walls. Window placement may affect unit layouts. Ceiling cavities may be too tight for modern ductwork. Concrete, masonry, or steel conditions may limit where openings can be cut. Every one of those details can affect design, sequencing, and cost.
Homeowners can learn from this too. Whether converting a commercial space, renovating an older home, or adding a secondary suite, the same rule applies. The visible finish is the last part of the job. The hidden systems are what determine whether the space is safe, insurable, comfortable, and legal to occupy.
The takeaway for contractors is simple: price the unknowns honestly and document them early. The takeaway for owners is just as clear: do not treat an adaptive reuse project like a cosmetic renovation. Budget for investigation, code upgrades, and coordination. A good conversion can give an old building a second life, but only if the work behind the walls is done properly.
Source: The London Free Press
