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How Much Does It Cost to Extend an Attic of an Existing Home (15-20 m²)?

Writer's picture: Gabriel MikaelGabriel Mikael

Extending your attic can provide valuable additional space, whether for a home office, bedroom, or storage. However, understanding the costs involved is crucial to planning effectively. Below is a detailed breakdown of the expenses associated with extending an attic of 15-20 square meters.

1. Key Factors Influencing Costs

The total cost of an attic extension depends on several factors:

  1. Structural Changes: Reinforcing the roof or floor to handle the new space.

  2. Roof Modifications: Adding dormer windows, skylights, or raising the roofline.

  3. Insulation and Ventilation: Ensuring the attic is energy-efficient and well-ventilated.

  4. Utilities: Extending electrical wiring, HVAC, or plumbing if required.

  5. Finishes and Interiors: Flooring, walls, lighting, and other design elements.

2. Cost Breakdown

Here’s a detailed estimate of costs for a typical attic extension project:

Item

Estimated Cost (USD)

Details

Structural Modifications

$2,000 - $5,000

Reinforcing floor joists, roof structure, or walls.

Roof Alterations

$3,000 - $8,000

Installing dormers, skylights, or extending the roof.

Insulation

$1,500 - $3,000

Materials like spray foam, rigid boards, or fiberglass.

Ventilation Systems

$500 - $1,500

Adding vents, fans, or improving airflow.

Electrical Work

$1,000 - $2,500

Installing outlets, lighting, or circuits.

Plumbing (if needed)

$1,500 - $3,000

Adding pipes for a bathroom or sink.

Interior Finishing

$3,000 - $7,000

Walls, ceilings, flooring, and painting.

Permits

$500 - $2,000

Depending on local regulations.

Labor Costs

$5,000 - $12,000

Contractors, electricians, plumbers, etc.

Total Estimated Cost

$18,000 - $48,000

Depending on complexity and location.

Additional Costs to Consider

  1. Design Fees: $1,000 - $3,000 for architects or engineers.

  2. Furnishings: Depending on usage, additional costs for furniture may apply.

  3. Unforeseen Expenses: Always budget 10-20% extra for unexpected issues.


Cost-Saving Tips

  1. Keep the Design Simple: Avoid major structural changes or complex roof modifications.

  2. DIY Certain Tasks: Painting or finishing can be done yourself to reduce costs.

  3. Reuse Materials: Salvage materials where possible for a budget-friendly approach.

  4. Plan for Energy Efficiency: Invest in quality insulation to save on future energy bills.


Extending your attic can cost between $18,000 and $48,000, depending on your choices and the complexity of the project. A well-planned attic extension can add significant value to your home and improve your living space.

For accurate estimates, consult with local contractors or architects to tailor the project to your budget and needs.


How Much Does It Cost to Extend an Attic of an Existing Home (15-20 m²)?
How Much Does It Cost to Extend an Attic of an Existing Home (15-20 m²)?


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