Extensions: Get a free price quote
Extensions
Do you dream of having more space at home, without moving? Then an extension could be the perfect solution. With an extension, you can create an extra bedroom, extend your living room or have a lovely conservatory.
Or maybe you’d like a practical storage room or a cozy barbecue hut in the garden? The possibilities are endless! On this page you’ll find information about what an extension is, price examples of different types of extensions, application requirements and much more.
We can also provide you with a free, no-obligation quote from a contractor in your area.
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What is an extension?
An extension is an expansion of the home that results in the home being extended to provide more space. Extensions provide extra floor space on one or more floors. You can build many different types of extensions, depending on your needs. Here are some common examples:
Storage room
A shed provides good storage space for things that don't fit inside the home itself, such as bicycles, garden furniture and tools.Conservatory
A conservatory is an extra room with large windows that provide plenty of light. Here you can grow plants or enjoy the sun for much of the year.Kitchen/living room
If you need a larger kitchen or a more spacious living room, you can add a few extra square meters.Bedroom
If you have more family members and need an extra bedroom, an extension could be the solution. That way you don't have to move even if your space requirements change.Bathroom
An extra bathroom is always nice to have. With an extension, you can easily make room for a bathtub and sauna if desired.Garage
A garage or carport built adjacent to the home is also considered an extension. Here you get safe parking and extra storage space.Entrance hall
A larger entrance hall with a cloakroom, storage room and space to store shoes can make the room more practical for everyone living in the house.
What does it cost to build an extension?
The price of an extension varies depending on size, choice of materials, construction and how complicated the building process is.
Prices for extensions usually range from around NOK 20,000 to 50,000 per square meter. On average, the price per square meter for extensions is around NOK 35,000. For example, building a bathroom is more expensive than building a bedroom. An extension of 20 square meters will usually cost in location between NOK 400,000 and NOK 1,000,000.
Here are some specific price examples based on different types of extensions:
- Bedroom extension 15 sqm: From approx. NOK 300,000
- Kitchen/living room extension 20 sqm: From approx. NOK 700,000 incl. plumbing and electrical work.
- Bathroom extension 10 sqm: From approx. NOK 500,000 incl. membrane, tiling and plumbing.
- Simple storage room extension of 5 sqm: From approx. NOK 75,000
- Conservatory extension 25 sqm: From approx. NOK 600,000
- Extension of garage 20 sqm: From approx. NOK 300,000
It is difficult to provide specific price estimates without first carrying out a thorough inspection to map the scope of the job. Prices can vary greatly, and these price examples are only intended as a guide.
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What can affect the price of extensions?
Craftsman costs
Electrician, plumber, carpenter, excavation contractor, bricklayer, architect, painter, and tinsmith.The size and design of the extension
Number of square meters and floors. Height under roof and roof pitch. Necessary adaptations to existing buildings.Choice of materials
Framework and cladding in wood, brick, glass or steel. Insulation, windproofing and vapor barrier. Roofing material such as tiles, shingles and cardboard.Groundwork and foundations
Excavation, blasting and removal of masses. Drainage and insulation against the ground. Casting of foundations and floors.Technical installations
Kitchen with white goods and ventilator. Wet room with plumbing, tiling and underfloor heating.Architectural drawings and building applications
The hourly rate of the architect. Fees for municipal building application processing.Electricity, water and drainage
Scope of excavation and pipe work. Number of sockets, downlights, heating cables etc.Ventilation and heating
Balanced ventilation system with heat recovery. Heat sources such as heat pumps and panel heaters.Geographical location
Prices may vary depending on where you live in the country. Labor and shipping costs can also be affected by distance.
Are extensions subject to application?
In recent years, there have been several changes to the building regulations that have simplified the process of getting an extension approved on your own property. In 2015, the rules were adjusted to make it easier to erect smaller structures without having to go through an extensive application process. Among other things, it became possible to build terraces, tool sheds and greenhouses of a certain size without a building application.
On May 1, 2021, another simplification of the rules came into force. It is now possible to build extensions of up to 15 m² intended for permanent residence without the need for an application. This opened up the possibility of expanding the home with an extra room without having to fill out a lot of paperwork.
Although national building regulations have become more flexible, it’s important to check whether special rules apply in your area. This is because the application rules for extensions do not override any restrictions in the zoning plan for your property. There may be specific limits for height, roof angle and distance to the neighboring boundary that override the general rules.
If you live in the beach zone, there are also restrictions on what you can build as an extension. Here, the building regulations are particularly strict to prevent the degradation of attractive areas along the sea.
Before you start building an extension, you should therefore always check with your local authority’s planning and building department what applies to your property. That way you can avoid doing something that is not allowed.
The Norwegian Building Authority has created a guide that shows which extensions can be built without applying.
How close to the neighbor can you build an extension?
According to the Planning and Building Act, as a general rule, you cannot build closer than 4 meters to your neighbors. This also applies to smaller buildings and extensions that do not require an application. If you want to build closer than 4 meters to the boundary, you must apply to your neighbors for consent.
The distance is measured from the outer edge of the extension. In towns and city centers, local regulations may allow construction closer to the neighboring boundary than 4 meters. Always check with the planning and building department in your municipality to find out what applies.
Can you design an extension yourself?
You can try drawing an extension yourself first to visualize it, but professional architectural drawings are a great advantage when building an extension. An architect can ensure that the drawings work well and meet the required standards. They can also take care of the dialog with the municipality in the building application process.
Most classes of measures still require professional architectural drawings in order to obtain a building permit.
What does it cost to have an extension design?
The price of architectural drawings for extensions depends on the size and complexity of the project.
For smaller, simple extensions such as sheds and garages, the price starts at around NOK 5,000. For larger and more complicated extensions with several rooms, the price will be between NOK 15,000 – 60,000 for a complete set of working drawings and application documents.
Hourly rates between NOK 1,000-1,800 are common.
What is the difference between an extension and an addition?
Many people confuse the terms extension and build-on, but there is an important difference between the two. An extension is when you expand your house by building a new section at ground level next to the existing house. You then have to dig out space for a new foundation wall and pour this together with the old foundation wall.
An extension, on the other hand, is when you build on top of the existing house and extend it in height. In this case, you don’t need to create a new foundation as the new building rests on the walls of the floor below. On the other hand, you often need to reinforce walls, floor partitions and roofs so that the house can withstand the weight of an extra floor.
Additions can be smart if your plot is already fully utilized, and you don’t have room to build in width. However, they tend to be a little more expensive than extensions, especially if the house needs a lot of reinforcement. When building an extension, the amount of groundwork needed will be an important price driver.