Cost to Add a Bedroom & Bathroom: Per-Square-Foot Breakdown

Adding a primary suite (bedroom + bath) to an existing home typically runs $150–$350+ per square foot for a basic one-story addition with standard finishes.

What Drives the Range

• Size & complexity: Larger, simpler boxes cost less per SF; complex tie-ins cost more.
• Finishes: Tile, fixtures, flooring, cabinetry swing the budget.
• Structural work: Foundation, roof tie-in, load-bearing walls.
• Systems: HVAC extension, plumbing runs, electrical panel upgrades.
• Location: Labor/material costs vary by metro/region.
• Permits & fees: Design review, impact fees, inspections.

Typical Project Budget (400–600 SF suite)

• Low end: $60K–$90K
• Mid: $100K–$150K
• High: $200K+

Always get 3+ detailed bids from licensed GCs after a site visit and schematic design. Online estimators are rough guides only.