Four types of house additions that add more space


There are a few types of house additions that can be made to meet homeowners’ requirements for space, cost, and style. There are many house additions, from small, DIY sunrooms that are easy to build, to large, conventional additions that cost a lot. Garage conversions are considered additions because so much living space is gained at once.

All you need to know about bump outs

These are the four main types of house extensions you should consider when expanding your home.

Conventional House Addition

Conventional house additions are multi-room structures that are built on the side of a house. They are permanently visible from the main house. A house addition blends in with the main house and can be built well.

An addition to a house can include a great room, dining area, family room and bathroom. A kitchen is rarely added to an addition unless it is intended to be an apartment.

About This Term: Primary Bedroom

The national Real Estate Standards Organization and many real estate associations recommend that the industry unite around a term that is less discriminatory, better defines the purpose of the room, and is more inclusive. The name “Primary Bedroom” has become a popular term in the real estate industry and better describes the purpose of the space.

Full-size house extensions are expensive and can be costly. However, they often return a high amount of value relative to the cost of their construction. It is a tedious and lengthy process to add a conventional addition. It is often helpful to think of your house as a mini-house. This includes permits, wiring, HVAC, plumbing and change orders.

Room Addition or Bump out

A room addition, or bump out, is a room added to a house that serves a single purpose. Sometimes, it expands one room in an existing house.

A house bump out or room addition is an addition that has been scaled down. You might add 50 square feet to your kitchen in order to make room for a kitchen island. You might also cantilever a few feet further out to make a cramped area for eating and socializing a more comfortable space.

Bump outs and room additions often install a new roofline. This may be a flat or shed-style roof. These types of additions can be cheaper than full-size conventional additions but they are still expensive. These additions are subject to building codes and permits as well as inspectors.


Sunrooms are an addition to the house on the side that serves as a living space. Sunrooms can usually be separated from the main house by doors.

Sunrooms cannot be used as an alternative to conventional additions. Sunrooms are usually smaller than full-size additions and made from prefabricated materials like aluminum and thermal-resistant glasses. They are often assembled on site. Sunrooms can be stick-built using lumber, concrete, or other materials that were used in the construction of the house. This creates a living space that is visually identical to the existing house.

Sunrooms should not be used as permanent sleeping spaces. Sunrooms are not permitted to have bathrooms or kitchens. Sunrooms cannot be used as permanent living spaces year round. This is why certain features that are possible in sunrooms can’t be done with a traditional addition are possible. Sunrooms can be constructed with large glass and other fenestrations that are not possible in a traditional addition. Sunrooms do not need to be equipped with heating or air conditioning.

Garage Conversion

A garage conversion is an attached one- or two-car garage that has been converted into a living area by installing flooring, a solid wall and a ceiling. Garage conversions can be used as living spaces or bedrooms.

It is tempting to turn garages into living spaces. It already has the basic structure of walls, foundation, concrete flooring and roof. A number of elements required for living spaces, such as electricity or windows, are either partially or fully in place. Many garages have drywall already attached to the studs. This makes it easier for you to complete this task. Garage conversions have their downsides. It can be hard to blend the garage conversion with the rest. Major systems like plumbing and HVAC may not be in place so they will need installation.