1. Average Cost

• Cost per Square Foot: $40–$70.
• Total Project Cost by Extension Size:
  | Project | Size | Cost Range | |----------------------|----------------|-----------------------| | Convert 1-car to 2-car | 8 x 20 ft | $6,400–$11,000 | | Convert 2-car to 3-car | 10 x 20 ft | $8,000–$14,000 | | Convert 1-car to 3-car | 22 x 22 ft | $19,360–$33,800 |

2. Cost Breakdown

a. Design and Permits

• Structural Engineer: $200–$1,500 (1%–20% of budget).
• Permits: $200–$1,500, depending on location and complexity.

b. Demolition (if needed)

• Wall Removal: $1,200–$3,000 for load-bearing walls.
• Factors: Plumbing/electrical inside walls can increase costs.

c. Foundation and Framing

• Foundation: $4–$25/sq. ft. (depends on soil and type).
• Framing: $4–$8/sq. ft. for new walls and beams.

d. Electrical and Plumbing

• Electrical: $50–$100/hour (for outlets, lighting, garage door motors).
• Plumbing: $45–$200/hour (if adding a sink, washer, or spigot).

e. Roofing and Garage Doors

• Roofing: $1,000–$3,000. Simple roofline extensions cost less.
• Garage Door: $750–$3,000 (based on size and style).

f. Exterior Finishing

• Siding Costs:
  | Material | Cost (per sq. ft.) | |------------------|------------------------| | Stucco | $7–$9 | | Vinyl | $3–$12 | | Wood | $1–$15 | | Brick | $10–$20 | | Stone | $7–$30 | | Fiber Cement | $5–$14 |

g. Interior Finishing

• Drywall and Insulation (Optional): Costs depend on size and material choices.
• Painting: $1–$6/sq. ft. (interior and exterior).

3. DIY vs. Hiring a Pro

• DIY Savings: Labor accounts for 50%–70% of total costs, saving $20–$50/sq. ft. by DIYing.
• Example: Extending a 200 sq. ft. garage saves $4,000–$10,000 in labor if DIY.
• Considerations:
• DIY is suitable for tasks like painting or minor demolition.
• Complex tasks (framing, electrical, plumbing, roofing) require professional expertise for safety and structural integrity.

4. Money-Saving Tips

• Limit Expansion: Add only the essential extra space.
• DIY Where Possible: Painting or installing a garage door opener.
• Delay Interior Finishing: Postpone drywall or insulation if budget-constrained.
• Choose Affordable Materials: Opt for cost-effective siding and roofing.
• Plan Thoroughly: Avoid costly changes during construction by finalizing plans early.

5. Is a Garage Extension Worth It?

• ROI: Recoup 75%–85% of the investment upon resale.
• Best Uses: Storage, workspace, or accommodating more vehicles.

A garage extension enhances functionality and boosts home value—a practical upgrade for homeowners with growing needs!

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