Second-Story Additions

Building up when the lot will not let you build out

On many Massachusetts lots there is simply no room to build outward. Setbacks pin the house in, the septic field takes the backyard, or the lot coverage limit is already used up. A second story adds living space without adding footprint, and on a ranch or a small Cape it can come close to doubling the house.

A second-story addition can be a full floor over the whole house or a partial one over part of it. On a Cape, a common version raises the back slope of the roof into a full-width shed dormer, which turns cramped knee-wall rooms into full-height space. On a ranch, a full second floor changes the look of the house entirely, and the design has to make it read as one house rather than a box set on top of another box.

Height limits still apply, and towns count stories and measure height in different ways. An older house that already sits inside a setback may need a zoning board finding even to build straight up. We check those rules before any design work, so the plan you fall for is one the town will allow.

Building up also leaves the yard alone. The gardens, the patio and the mature trees stay where they are, and the lot keeps the open space that both zoning and your family care about.

Proving the foundation and first floor can carry it

A house built as a single story was framed and founded to carry one story. Adding another puts new load on the walls and beams, and all of it ends up on the footings. Before the design goes far, we look closely at the foundation and the framing, and a structural engineer typically confirms what they can carry. A ranch with its center bearing wall resting on a basement beam and a Cape with undersized ceiling joists are both common starting points.

Often the foundation is sound and the first floor needs reinforcement: new posts under the main beam, a heavier beam, or sistered joists so the old ceiling becomes a proper floor. Sometimes footings need to be enlarged where new point loads come down from above. Older fieldstone foundations need extra care and sometimes repair before they carry anything more.

This is the part that cannot be guessed. If the engineering says the foundation needs work, that work goes into the written scope as its own item, with the reasoning attached, before you commit to the second floor. Better you hear it at the kitchen table than from an inspector halfway through.

Houses built before 1978 may have lead paint on the trim and siding, and a second-story addition disturbs a great deal of both. We follow lead-safe work practices wherever older paint is cut or removed.

We frame it with those in mind and mark the layout on the floor with you before any framing goes in.

Opening the roof and keeping the weather out

The risky stretch of a second-story addition is the period when the roof is off. We plan that work for a window of settled weather wherever possible, remove only as much roof as can be framed and closed in quickly, and keep heavy tarps and temporary protection on site and ready. Rain falling into an open house is the failure everyone worries about, and the sequence is how we avoid it.

On some houses we can frame the new walls and roof above the old roof before taking it off, which keeps the house covered longer. That option depends on the existing roof structure and the new design, and we tell you which approach your house allows before the job is scheduled.

The new roof gets ice and water membrane at the eaves and valleys, proper ventilation, and insulation that meets the stretch energy code where the town has adopted it. Ice dams are especially common on older Capes, and a new roof is the chance to fix the conditions that caused them instead of carrying them up a floor.

Inside, the old attic floor usually becomes the new floor, so once the new roof is tight we insulate between the floors for sound rather than for heat.

Where the new stair goes

A second floor needs a stair, and a single-story house does not have one. The stair takes real space on the first floor, roughly the footprint of a large closet or a small room, plus headroom above. Where it lands shapes the plan of both floors, so it is one of the first decisions we make.

Common locations are a hallway, part of a large living room, or a slice of a bedroom. On a Cape that already has a narrow, steep stair to the attic rooms, we usually rebuild it to meet current code for headroom, rise and run. On a split-level, an existing half-flight can sometimes continue upward. We look at how people move through the house and where the stair arrives on the new floor before settling it.

Plumbing and heat also need a path up. A second-floor bathroom is easiest stacked over a first-floor bathroom or the kitchen, and new ducts or pipes need a chase through the first floor. We plan those routes with the licensed trades early, because they affect which first-floor walls get opened.

A stair is also something inspectors look at closely: headroom, handrails and the guard at the top. We frame it with those in mind and mark the layout on the floor with you before any framing goes in.

Living below a job that is going on above you

Some families move out for part of a second-story addition and some stay. It depends on the scope, the season and how much of the house is affected. The roof-off stretch is the hardest to live through. We talk about it honestly at the start so you can plan, and we tell you which weeks are likely to be the difficult ones.

When you stay, we protect the first floor. Ceilings may be opened for structural work, floors are covered, and dust walls separate the work from the rooms you are using. Water and power interruptions are announced well ahead of the day they happen.

Steve runs the job, with the written scope before we start, the schedule updated as inspections pass, and every change in writing. Fast response and clear updates are the standard Modern Remodeling holds itself to, and on a job that puts a crew above your bedroom, that is the part that matters most.

See the rest of our additions work, or browse the gallery for rooms we have finished.