![]() ![]() It is usually meant for a single function, such as a bedroom or bathroom. This kind of project is considered a major addition, and nationally, costs average about $72,000, but it is easily possible to spend $150,000 or more if the addition is quite spacious or uses upper-end materials.īest for: Adding a single room to the home.Ī room addition or bump out is a single room structure built onto the side of a house. When such additions are designed so that they have all the features needed for independent living, they are sometimes known as AADUs (attached accessory dwelling units). They are subject to all of the same building codes and permit requirements, and they normally require extensive excavation, foundation work, and subcontractors who install wiring, plumbing, and HVAC service. Major additions have all of the issues and requirements that come with full house construction. But it is rare for an addition to include a kitchen, unless the addition is intended as an apartment suite. A house addition can have many types of areas: great room, dining room, family room, bathroom, guest bedroom, or primary bedroom. ![]() When well designed, a house addition blends into and creates an entirely different house. But the costs can vary enormously depending on the size of the space and if structural alterations-such as new egress windows-are necessary.īest for: Major, multi-room home additions.Ī conventional house addition is a multi-room structure that is built onto the side of a house and is permanently open to the main house. Nationally, the cost of finishing a full attic space averages about $40,000 basement finishing costs are usually about half that. Any converted spaces that include sleeping areas must have egress exits, which may mean adding special windows. Attic conversions are practical only for home with attics that are framed without roof trusses. Ceiling height must be sufficient, and floor and ceiling structures must meet engineering requirements in order to support the structural loads of active living spaces.Ī basement must be utterly dry, and attics must be amendable to insulation and ventilation requirements mandated by the local building code. And it is one of the few expansion projects that recoups its full investment through added real estate value.īut an attic or basement must meet certain structural qualifications to make it practical to turn them into code-approved living space. Here is some basic information on six common types of additions that can give you more living space and the factors you should consider when choosing which is best for you and your home.īest for: Adding living space without changing home footprint.Īlthough technically not an "addition"-it doesn't expand the actual footprint of your home-converting existing unfinished space in a basement or attic can be one of the most cost-effective ways to add practical living space. Called DADUs (detached accessory dwelling units), these, too, fall under the category of home addition. And an increasingly popular option is a secondary living structure detached from the main house, used as an independent dwelling unit. Garage conversions can even legitimately be called additions since so much living area is added at once. ![]() They can range from relatively low-cost attic or basement expansions to expensive, full-size conventional additions that require excavation, footings, and additional siding and roofing. Home additions come in a number of basic types to address homeowners' needs for living space, cost, and style. That's where house additions enter the picture. Even homeowners who claim that their house is big enough may, from time to time, want a bigger kitchen, an extra bedroom, or a larger bathroom. Sooner or later, an addition is a universal desire of most homeowners.
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