What is a Bump-Out?

• A bump-out is a small extension of an existing room (e.g., kitchen, bedroom) without the cost or scale of a full room addition.
• Sizes: Typically extend 2–15 feet from the home, with smaller ones often cantilevered without a foundation.

Cost

• Average Cost Range: $4,000–$30,000.
• National Averages:
• Small cantilevered bump-out (2 feet): $5,000.
• Larger bump-out (4x10 feet): Up to $30,000.
• Regional Variations:
• Boston, MA: $6,000–$35,000.
• Detroit, MI: $3,500–$30,000.
• Phoenix, AZ: $5,000–$28,000.

Cost Breakdown

• Permits: $400–$1,500.
• Contractor Fees: 10%–20% of the total project cost.
• Windows: $3,500–$15,000 (large bay windows or skylights at higher end).
• Electricity: $50–$100/hour for wiring or installing fixtures.
• Interior Finishing:
• Painting: $2–$6/sq ft.
• Flooring: $3–$22/sq ft.
• Exterior Finishing:
• Siding: $3–$11/sq ft.
• Roof extension: $50–$85/linear foot.
• Plumbing (if needed): $45–$200/hour or $1,500–$6,100 for fixtures.
• Foundation (if required): $4–$16/sq ft.

Cost by Room Type

• Kitchen Bump-Out: $100–$300/sq ft (plumbing and electrical increase costs).
• Bathroom Bump-Out: $200–$300/sq ft (more costly due to plumbing).
• Bedroom Bump-Out: $80–$200/sq ft (lower range without plumbing).
• Garage Bump-Out: $40–$70/sq ft (simpler construction).

How Far Can a Bump-Out Extend?

• Cantilevered Bump-Outs: Up to 2 feet without additional support.
• Larger Additions: Require foundation or posts for structural support.

How to Save on Costs

• Limit Mechanical Work: Avoid extensive plumbing or HVAC changes.
• DIY Small Tasks: Take on demolition, debris removal, or painting.
• Compare Quotes: Get at least three bids, avoiding unusually low estimates.
• Reuse Materials: Use salvaged or second-hand materials when possible.

Budget-Friendly Options

• $5,000 Budget: A 2-foot kitchen extension or bay window addition.
• $10,000 Budget: 2x10-foot library nook or playroom storage.
• $20,000 Budget: 3x10-foot entryway or porch expansion.
• $30,000+ Budget: 4x10-foot laundry or mudroom addition.

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