Residential fire sprinklers in Columbia Heights

Columbia Heights has the biggest rowhouses in the District outside of Capitol Hill: wide three story brick houses from the 1900s and 1910s that were built for one large household and have spent the last twenty years being cut into flats. The English basement is the classic move here. A front areaway, a separate door under the stoop, and the lower level becomes a rental unit that pays a good part of the mortgage. The moment it becomes a separate dwelling unit, the house is a two unit building, and a 13D system covering the house comes with the permit.

The newer version of the same idea is the accessory dwelling unit. Some Columbia Heights lots run deep enough for a garage or carriage house on the alley, and owners are converting them or building new. A new ADU is new construction, which means a 13D system as part of the permit, and a two story ADU generally makes the property a two family dwelling with the full system that implies. Whether it is the basement or the alley building, the question we answer first is the same: how many units does the property have when the work is done, and can the water service feed all of them plus the sprinklers.

That water question is louder in Columbia Heights than the size of the houses suggests. A big rowhouse with a big demand on a service line from 1910 is a service upgrade waiting to happen, and adding a unit tips it over. We pull the records with DC Water, confirm the size at the meter, and run the calculation before the quote. Occupied houses with plaster ceilings and a family living upstairs put the retrofit toward the top of our range; a basement already open to the joists brings it down. Either way you get the number before the permit set goes in.

Why Columbia Heights calls us

• English basement and ADU conversions are the two jobs we do most in Columbia Heights, and we design the system for the finished unit count.
• Service upgrades are common on these large 1910s houses, and we check the records with DC Water before quoting.
• We work in occupied rowhouses with tenants upstairs and plan the pipe routing to keep the disruption to a few rooms.
• The hydraulic calculation goes into the first DOB permit set so review does not stall on it.

What it costs in Columbia Heights

Same published table as everywhere we work. New construction, including new houses, townhouses, and new ADUs, runs $1.35 to $1.60 per sprinklered square foot. Retrofits in an existing house run $2 to $7 per sprinklered square foot, toward the top when ceilings are finished and the house is occupied, toward the bottom when the walls are already open. Water service upgrades are priced separately after we check the records with DC Water. The full breakdown is on the cost page, the unit count rules are on the ADU and conversion guide, the service line question is covered on the water service page, and existing systems are handled through inspection and repair.