Additions and Conversions · Additions
Second Story Addition Installation Cost, Permits and Who Does the Work
First-time installation of second story addition on a single-family home, typically handled by a general contractor.
Model reviewed August 2026
Typical cost
$190,000
National, standard scope
Range
$90,000 – $400,000
Low to high scope
Trade
General contractor
DIY difficulty 1/5
Permit
Usually required
Plan on a permit and inspection
Do I need a permit for second story addition installation?
Usually yes
Second Story Addition work at this scope touches structure, life safety or a permitted trade in most jurisdictions, so a permit and inspection are normally required. Always confirm with the building department that has jurisdiction over your address.
Cost breakdown
Modeled national figures for a standard single-family job.
| Low endSimple scope, easy access, no surprises | $90,000 |
|---|---|
| TypicalWhat most homeowners pay | $190,000 |
| High endLarge scope, upgrades or difficult conditions | $400,000 |
| Job type | Project |
| Cost varies by location | High |
Calculators for this job
Also searched as
You may also hear this called:
install second story addition · new second story addition · second story addition install cost · put in second story addition
Frequently asked questions
How much does second story addition installation cost?
Most homeowners pay between $90,000 and $400,000, with $190,000 typical for a standard single-family job. Figures are modeled national estimates, not quotes.
Do I need a permit for second story addition work?
Yes — in most jurisdictions this job is permitted and inspected. Check your local building department before work starts.
Who does second story addition installation?
A general contractor handles this job. DIY difficulty is rated 1/5 (5 = very DIY friendly).
Does the price change much by location?
Yes. Across the states we price, the typical cost ranges from $171,000 to $248,900 — about a 46% spread — driven by labor rates, code requirements and permit fees.