Addition cost per square foot — October 2026 market guide
| Scope (market guide, Oct 2026) | Published figure | Source basis |
|---|---|---|
| Additions, Atlanta design-build | $300–$525+ per sq ft | Silver Oak: starter $300–425, mid $425–525, luxury $525+ |
| Second-story addition, Atlanta average | $350 per sq ft · avg total $175,175 | Angi Atlanta (updated May 2026) |
| Primary suite addition, midrange | $162,109 job cost · 36.6% recouped | Cost vs. Value 2025, Atlanta |
| Primary suite addition, upscale | $330,626 · 20.4% recouped | Cost vs. Value 2025, Atlanta |
Market guide ranges, October 2026 — published Atlanta/Marietta sources and Remodeling Magazine Cost vs. Value 2025 (Atlanta), reconciled in our research. These are planning ranges, not a quote for your home; your written scope sets your price.
Additions recoup the lowest percentage of any major project in Cost vs. Value — and homeowners still build them, because the maths that matters is stay-vs-move: your rate, your schools, your lot. We show both sets of numbers.
Permit and HOA order of operations
- Survey and setback check for your parcel and jurisdiction
- HOA architectural review packet where your subdivision requires one — drawings, materials, colours (we submit to your HOA's guidelines, provided by you; HOA rules vary and we do not guess them)
- City (SagesGov) or County permit, then footing → foundation → framing → rough-in → insulation → final inspections
New conditioned space also needs an HVAC load calculation — a bigger box on the same system is how additions end up hot in July. Read planning a home addition in Marietta.
Which addition fits?
Primary suite addition — the East Cobb pattern: main-level suite so the house works for the next 25 years. Second-story addition — for small lots near the Square and Whitlock where footprint cannot grow. Home office addition — a door that closes, its own page here. Sunroom — usually better as a screened porch in Georgia's climate.