Here’s How Much a Simple Addition Will Cost

SMALL ADDITION
100 – 300 SQ FT
$150,000 – $200,000

MEDIUM ADDITION
300 – 600 SQ FT
$200,000 – $300,000

LARGE ADDITION
600 – 1,000+ SQ FT
$300,000 – $650,000

SimpleAddition-768x576.jpgA simple addition is the most basic and affordable way to expand your home’s living space. It typically consists of a rectangular room with standard construction – four walls and a roof – added to your existing house. Common examples include a bedroom, office, or family room.

This type of addition works best on level ground with minimal excavation needed. The straightforward design keeps engineering and construction costs low. A side bedroom with a crawl space foundation is a typical example.

Common features of a Simple Addition include:

  • Single level on the ground floor
  • Slab or crawl space foundation
  • Bedroom, living room, or office
  • No major excavation
  • Minimal plumbing & electrical
  • Basic structural design

Here’s How Much a Standard Addition Will Cost

SMALL ADDITION
100 – 300 SQ FT
$200,000 – $300,000

MEDIUM ADDITION
300 – 600 SQ FT
$300,000 – $650,000

LARGE ADDITION
600 – 1,000+ SQ FT
$650,000 – $1,200,000

StandardAddition-768x576.jpgA standard addition is more complex than a simple room addition because it typically includes utilities like plumbing and electrical work. Examples include bathrooms, kitchens, or laundry rooms.

These projects require more extensive engineering and design work. For instance, a kitchen addition needs detailed planning for cabinet layouts and appliance placement. These extra complexities increase both design time and overall cost.

Common features of a Standard Addition include:

  • Basic shape with some variation
  • Slab or crawl space foundation
  • Bathroom, kitchen, or laundry room
  • Requires some excavation
  • Lighting fixtures
  • New flooring

Here’s How Much a Complex Addition Will Cost

SMALL ADDITION
100 – 300 SQ FT
$250,000 – $400,000

MEDIUM ADDITION
300 – 600 SQ FT
$400,000 – $880,000

LARGE ADDITION
600 – 1,000+ SQ FT
$800,000 – $1,500,000+

2ndStoryDuring.jpgA complex addition involves extensive engineering and specialized construction due to its scope or unique challenges. These projects typically:

  • Significantly alter the existing home’s structure
  • Require comprehensive utility systems (plumbing, electrical, and HVAC)
  • Feature specialized architectural or design elements

Examples include historic home renovations, multi-level additions, and accessory dwelling units (ADUs).

  • 2nd story, basement, or multi-level
  • Complex, custom shape
  • Multiple rooms & functions
  • New flooring
  • Updated backsplash
  • New lighting fixtures
  • Custom features

What Affects the Cost of Your Home Addition?

There are several factors that may influence the cost of your home addition. Here are the 3 most important ones to consider when planning your project.

1. Level of Customization

The more customized your home addition designs, the more the project will cost. Custom work requires more labor and higher-quality products, so be prepared to pay more for custom features.

2. Labor & Construction Administration

Some homeowners prefer to have a more involved role in organizing or constructing their home addition. Others simply want to hire a contractor who will handle the entire process. The more involved your contractor is in managing and constructing the project, the more expensive it will be.

3. Product & Material Quality

Nobody wants to build their home addition just to watch it fall apart a year later. However, high-quality materials and craftsmanship for your addition often come at a higher cost.

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