What a sprinkler retrofit looks like in a rambler, a split level, a colonial, and a townhouse

Northern Virginia was built in waves, and each wave left a house shape behind. The 1950s and 60s gave Annandale, Vienna, and McLean the rambler. The 70s filled Burke, Springfield, and Sterling with split levels and split foyers. The 80s through the 2000s put colonials on every lot from Fairfax Station to Leesburg, and townhouses everywhere a builder could fit a row. Our cost page gives one retrofit range for all of them, $2 to $7 per sprinklered square foot, and the retrofit cost article explains what moves a quote inside it. This article is the other half of that answer. It walks through where the pipe goes in each of the four shapes, because the shape of the house decides most of the price before we measure a single room.

The rambler

One story, a low attic over everything, a crawlspace or an unfinished basement under everything. For a sprinkler installer this is the easy one. The riser goes in the basement or the utility room, the main runs up a closet or a chase to the attic, and every head in the house drops through the ceiling from above. No finished ceiling gets opened. Concealed pendent heads with flat white cover plates go in the bedrooms and the living room, and a sidewall head handles the kitchen if the attic has a vault in the way.

The two things that complicate a rambler are both about cold. The attic is unheated, so the pipe up there needs the insulation over it, or dry heads, or the loop kept inside the heated envelope, as the freeze protection article lays out. And if the house sits on a crawlspace, the main under the floor needs the same care, covered in the crawlspace article. A rambler on a slab with a cathedral ceiling in the great room loses the easy attic route and moves up the range. Most ramblers land near the bottom of it.

The split level and the split foyer

Half levels stacked on a slope, a bedroom wing a few steps up from the living room, a family room a few steps down, and a garage tucked under the bedrooms. The attic still covers the upper level, so the bedrooms are fed from above like a rambler. The lower level is where the work is. Its ceiling is the floor of the bedroom wing, and in most of these houses it was finished with drywall forty years ago.

We run the lower level from two directions. Heads along the outside walls come from sidewall heads fed through the wall from the garage side or from a closet, which spares the ceiling. Heads in the middle of the family room come down from the floor cavity above, which means a few access cuts in the drywall that get patched after. The garage under the bedrooms is exempt under 13D, which the rooms without sprinklers article explains, so the pipe that crosses it only has to be protected from the cold, not spread into heads. Split levels sit in the middle of the range. The number of finished ceilings between levels is what decides whether they lean low or high.

The colonial

Two full stories and a basement, which is the most common house we retrofit in Loudoun and western Fairfax. The second floor is easy. It sits under the attic, so every bedroom head drops from above. The basement is easy when it is unfinished, because the first floor heads can be fed from below and poked up through the subfloor and the first floor ceiling. The hard part is a finished basement, which most of these houses have by now, because then the first floor heads have to be fed through a cavity that is sealed on both sides.

Three ways around it, in the order we try them. Sidewall heads from the hallway, closets, and the stair wall, which reach most first floor rooms from one chase and leave the ceilings alone. A run through the basement ceiling with a drop ceiling tile or an access panel where the basement is finished with a grid instead of drywall. And, last, cut and patch drywall where no other route works, usually in the dining room or the kitchen. The patching and paint are normally priced on their own, which is one of the items the retrofit cost article lists as outside the per square foot number. A colonial with a finished basement and nine foot first floor ceilings lands in the upper half of the range. The same house with the basement still open lands close to a rambler.

The riser usually goes next to the water heater. The service line is the other thing we check on the first visit, because a 1990s colonial on a 3/4 inch line sometimes needs a bigger meter or tap, and the water meter article covers how Fairfax Water and Loudoun Water handle a meter upsize for sprinklers.

The townhouse

Three levels, twenty feet wide, with neighbors on both party walls. Newer rows in Ashburn, Brambleton, and Potomac Yard often came sprinklered from the builder, so the first step is to look for a riser and a cover plate before quoting a retrofit. The buyer’s checklist shows what to look for. Older rows in Reston, Burke Centre, and the Route 1 corridor usually have nothing.

A townhouse retrofit is a vertical job. One chase, often beside the plumbing stack or through stacked closets, carries the main from the riser on the entry level to the top floor. Each level is narrow enough that sidewall heads from the hallway side reach most of the rooms, and the top floor drops from the attic as usual. The finished ceiling problem on the middle level is the same as a colonial’s first floor, scaled down. What is bigger in a townhouse is the water. Many rows share a smaller service, and the HOA and townhouse article covers both the association approval and the party wall rules that come with running pipe near a shared wall. Townhouses land anywhere in the range depending on the water answer more than the pipe routing.

What all four have in common

• The permit. Every jurisdiction here treats a 13D retrofit as a fire protection permit with a plan review, which the permit timeline article walks through county by county.
• The riser. It needs a drain, a heated spot, and room to work. The utility room beside the water heater is the usual answer in all four shapes.
• The week of work. Most retrofits take about a week of work with the family in the house, described in the install week article.
• The attic. Three of the four shapes feed the top floor from the attic, and the attic is where a Northern Virginia system freezes if the insulation gets moved. Every retrofit ends with that conversation.

Getting a number for your house

The style tells us where to look. The estimate visit tells us the price. The estimate visit article lists what we measure, and a written quote follows with the head count, the pipe route, and the items outside the per square foot figure called out on their own lines. If you already have a bid in hand, the comparing bids article shows how to read it against the house shape described above.