Room Addition cost › Collier County
Room Addition Cost in Collier County, FL (2026)
Planning a room addition in Naples, Marco Island, Immokalee? A mid-range project of 400 new floor area (sq ft) typically runs $50,000–$100,000. Public sources do not publish reliable county-level price indices, so the ranges below are regional; local quotes may land higher or lower.
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Cost by finish level
| Finish level | Installed cost | Source |
|---|---|---|
| Basic: Basic finishes | $125–$250 per sq ft estimate | HomeGuide - Home Addition Cost (2026) |
| Mid: Mid finishes | $125–$250 per sq ft estimate | HomeGuide - Home Addition Cost (2026) |
| High: High-end finishes | $125–$250 per sq ft estimate | HomeGuide - Home Addition Cost (2026) |
Source gives one $125-$250/sq ft range; tiers are not split. Plumbing-heavy rooms (baths/kitchens) can exceed it.
Collier County permit notes
Additions need full plans, zoning/setback review, and possibly flood-elevation compliance. Expect the longest permit timeline.
- Collier County charges a minimum $100 application fee. Source
- Third-party estimate: about $316.50 for a 200 sq ft residential remodel permit and about $388.25 for a 2,000 sq ft re-roof (estimate, verify with county). Source
FAQ
How much does a room addition cost in Collier County?
Using public 2025-2026 cost-guide data, a mid-range room addition of 400 sq ft runs about $50,000 to $100,000 installed. Basic work starts around $125 per sq ft and high-end work can reach $250 per sq ft. These are estimates, not quotes.
Do I need a permit for a room addition in Collier County?
Additions need full plans, zoning/setback review, and possibly flood-elevation compliance. Expect the longest permit timeline.
Are these prices exact quotes?
No. They are planning ranges compiled from public sources such as HomeGuide and the Remodeling Cost vs Value report. Get written quotes from at least three licensed contractors.
Why are Florida prices different?
Florida building code wind-load and hurricane requirements, product approvals, insurance, and post-storm labor demand can push costs to the upper part of national ranges.