Adding Addition to a House

Many homeowners eventually come to that daunting dilemma: whether to buy their dream house or transform their current home into that dream. Once you make the commitment to build an addition, you've probably decided to go down the latter road. This decision might be something you've long considered, or it may have been thrust upon you by an expanding family. In either case, recognize that this will be a profound investment in time and money, but one that, if done properly, will enhance the value of your most important investment: your home.

aluminum addition

Aluminum Enclosure

When you decide to build the latter, the budget is one the profound consideration. There are many different factors including the square footage and the size of the addition that will largely affect the whole cost. In general, the larger you go, the more expensive the project will be. Some of the important factors include necessary services for the house addition for the project are as follows:

Design services

  • Architectural services make sure that the design of the new addition looks good with the
    style of the home. This typically accounts for 10% to 17% of the total project budget.

Main Construction

  • Excavation, demolition and site-preparation costs vary depending on the amount of work that needs to go into the prepping. For example, removing a wall costs $300–$500, while excavation costs around $2,559 on average.
  • Pouring concrete footings and a slab foundation costs an average of $75 per cubic yard
  • The support beams and roof trusses have to be integrated with the rest of the home's structure. The average cost runs from $15–$30 per square foot, depending on the lumber charges and labor costs.


  • Roofing for the new addition averages $80–$100 per square foot for asphalt shingles and
    galvanized metal flashing. Metal roofing and slate are two pricier options.
  • Molding for ceilings costs around $3 per foot.


  • Installing vinyl siding and trim finishes the exterior of your addition for an average cost of $7 per square foot.
  • Finishing the interior by drywalling the ceiling and walls costs an average of $9.80 for each 4-foot by 8-foot sheet of drywall.
  • Insulation costs $2 per square foot.
  • A door costs anywhere from $175 or more, depending on the material and the style of the door.
  • Adding windows for light and ventilation costs an average of $300–$700 per window.
  • Flooring options include ceramic tile ($1,640), carpeting ($1,490), laminate ($2,748), vinyl/linoleum ($1,185), natural stone tile ($1,826) or wood flooring ($4,396).

Mechanical and electrical

  • Electrical wiring and making sure the electrical system is up to code is important and it requires a licensed electrician, which typically costs $50–$100 per hour.
  • Tying into the existing HVAC system varies in cost, but the average cost for installing ducts and vents is $1,050.

Apart from the general list above, it also largely depends on the addition that you intended to do. You can choose from several types of additions for an average house, including ground level additions, second-floor additions, and detached additions. Each option has its own benefits, drawbacks and estimated prices based on factors such as the size of the structure and the features that you want to incorporate.

To build an additional room, for instance, average costs run anywhere from $80 to $200 per square foot. No matter whether you build out or up, it is advisable that you consult with an architect before getting started to make sure that the design looks cohesive with the rest of your home, which will help enhance the resale value. In addition to that, hire a structural engineer to make sure the plans are safe and sound and hire a general contractor or a remodeling company.


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