Addition cost depends heavily on foundation type, square footage and whether plumbing is included. Here is what homeowners in Calcasieu Parish typically plan for.
A room addition in the Lake Charles area typically runs $120 to $200 per square foot for a simple bump-out or bedroom addition, and $200 to $350 per square foot when the addition includes a bathroom or kitchenette. A 300 square foot bedroom addition often falls between $40,000 and $70,000.
These are typical 2026 planning ranges for the Lake Charles and Southwest Louisiana area, based on general industry cost data, not a quote for your project. Prices change with materials, labor availability and scope. Brothers Construction gives a written, itemized estimate after a site visit.
Foundation type and whether plumbing is added are the two biggest cost drivers for an addition in this area.
| Addition Type | Typical Cost per Sq Ft | 300 Sq Ft Example |
|---|---|---|
| Bump-Out or Sunroom (no plumbing) | $120 – $180 | $36,000 – $54,000 |
| Bedroom Addition | $140 – $200 | $42,000 – $60,000 |
| Addition with Bathroom | $200 – $350 | $60,000 – $105,000 |
Pier-and-beam or elevated foundations, required in some flood zones, cost more than a standard slab.
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Written, itemized estimates in Lake Charles and these surrounding Calcasieu Parish communities.
Prices above are typical planning ranges. For a fixed, itemized quote on your project, call or send the form and we will schedule a visit.
Call (337) 602-1283