What a Second Story Addition Requires
A second story addition adds living space on top of an existing house. It usually requires an engineer to confirm the foundation and walls can carry the new load, plan review to check height and zoning and a plan for where the family lives while the roof is open. Few remodels affect a house as much.
Start with feasibility before falling in love with a design.
Structural Capacity
Existing foundations and walls were often designed for one story. An engineer must check whether they can support another. If not, the foundation may need strengthening, which adds cost.
Because this step decides everything else, do it first.
Zoning and Height Limits
Zoning sets height limits and sometimes design rules. The City of Sacramento zoning information explains how districts apply. Plan reviewers also check setbacks and height during review.
Neighborhood design review or historic rules may add more steps.
Second Story Addition and Stairs
A new stair takes space on the first floor. Often a bedroom or living area gives up room. So plan the stair location early.
- Stair location and footprint
- Loss of first floor space
- Natural light at the stair
- Code rules for headroom and rails
Living Arrangements
Removing a roof exposes the house to weather. Many families move out during that stage. Because rain can arrive with little warning, ask how the crew will protect open framing overnight.
Also plan where furniture and belongings will go while the work runs. The article on living through remodeling covers the decision.
Systems and Energy
New floors need heating, cooling, plumbing and electrical service. Existing systems may not reach upstairs. The article on ducted versus mini split compares heating options.
Second Story Addition Versus Building Out
If the lot has room, a ground floor addition may cost less. The article on addition versus remodel compares paths. Also see bedroom addition for single room projects.
Second Story Addition Timeline
A second story usually takes longer than a ground floor project. Because the roof comes off, weather affects the schedule. Also, plan review for structural work can take several rounds.
So build a long buffer into the plan. Then the household can arrange housing and storage without rushing.
Next Steps for a Second Story Addition
Bring in an engineer for a feasibility review, check zoning and get rough estimates. Also ask the engineer what the foundation work might involve, since that often decides feasibility. Then decide whether a second story addition fits the budget and the household’s tolerance for disruption.