Planning a second-story addition

First question: can the house carry it

A second floor puts new weight on walls, beams and a foundation that were sized for a one-story house. Only a New York licensed professional engineer can say whether they can take it, or what reinforcing they need. That answer comes before any design, because it can change the budget more than anything else.

Height, stories and the zoning code

Town and village zoning codes limit how tall a house can be and, in some districts, how many stories it may have. A second story that clears the height limit may still trip a rule about floor area or setbacks. If it does not fit, the zoning board of appeals can hear a variance request, which adds an application and a public hearing. Our permit guides link each town's own pages.

Living through the roof-off weeks

For part of the job the roof is open. Ask every contractor how they protect the house from rain while it is open, how long that phase usually runs for a house like yours, and whether you should stay elsewhere during it. Families often move out for this stretch, so plan the budget for it.

The parts people forget

• The stair. A new stair takes floor space on the first floor. Decide where it lands before anything else is drawn.
• Heating and cooling. A new floor usually needs its own zone or system, and the ductwork has to get there.
• Plumbing. A new bathroom upstairs needs a drain and vent path down through the house.
• Electrical service. More rooms, more circuits: check whether the panel and service can carry them.

Permits and inspections

A second story is structural work, so building departments review it from drawings, usually by a New York licensed architect or professional engineer, and inspect it as it goes. At the end the town or village signs off on the new space.

Before you sign with anyone

• Check the contractor's county home improvement license yourself: Suffolk or Nassau, plus any town license on the East End.
• Ask for a certificate of insurance sent to you by the insurance agent, not a photo of one.
• Get the contract in writing and signed. New York's home improvement contract law, General Business Law section 771, requires the contractor's license number, a description of the work and materials, the price, the approximate start and completion dates, and a schedule if there are progress payments.
• Know your two protections under that law: you can cancel until midnight of the third business day after you sign, and payments made before the work is finished must be deposited as the state's Lien Law requires, unless the contractor gives you a bond or similar guarantee instead.
• Match each payment to finished work. A payment schedule that runs ahead of the work leaves you carrying the risk.