Rules for Attefallshus and Attefallstilbyggnad 2025 – How to build correctly from the start
- Konstruktionshjälpen
- Apr 13
- 4 min read
Are you dreaming of a detached house with a loft, toilet, sauna or perhaps an annex in the form of a cozy conservatory? Then it is important to keep track of the current regulations regarding detached houses – especially those regarding building permits , size , height and plot boundaries .
In this blog post, we go over everything you need to know before you build, including what may apply in 2025 under the new attefall rules .
🏡 What is an Attefallshus?
A townhouse is a detached building that can be built on a plot of land where there is already a single- or two-family home. It is often used as a guest house, teen accommodation, office or rental unit.
The most common types are:
Attefallshus turnkey – delivered ready to move in.
Attefallshus building kit – a cheaper solution where you build yourself or with help.
Attefallshus with loft – smart solution for utilizing ceiling height.
Attefallshus with basement – more unusual, but possible with the right soil conditions.
Attefallshus with sauna – perfect for relaxing on the property.
📐 Attefallshus dimensions, height and location
What do the 2024 housing regulations say?
Regulatory area | Applies |
Maximum building area | 30 sq m |
Maximum building height | 4 meters |
Distance to plot boundary | At least 4.5 meters without the neighbor's consent |
Number of single-family homes per plot | 1 pc |
💡 Tip: A 30 sq m extension applies to extensions to an existing residential building - e.g. for a larger kitchen, conservatory or extra bedroom.
🛠️ Attefall extension – what applies?
A temporary extension differs from a temporary house in that it must be built together with the existing home. Here are the rules that apply in 2024:
Max 15 sq m extension
Must not exceed the roof ridge of the residence
Requires notification to the municipality, but not a building permit in most cases
Must follow BBR (the Swedish Board of Housing, Building and Planning's building regulations)
If you are planning to build a conservatory , a bedroom , or why not a garage with a utility extension , you should also check what applies locally - some municipalities, for example, have restrictions regarding dotted land .
🛠️ The construction assistant guides you through the entire process
Building a multi-family home can feel like a big step – especially when it comes to understanding all the rules and handling the building application to the municipality. That's why we at Konstruktionshjälpen are here to make the process easy and safe for you.
We help you from idea to move in: we produce drawings, make construction calculations, and make sure that everything meets the requirements of the Swedish National Board of Housing, Building and Planning. We also handle the entire building application for you – so you don't have to worry and know that everything is going well. Whether you are planning a turnkey detached house, a detached house with a loft, sauna or as an extension – we have a handle on the regulations and will help you all the way!
💸 How much does a rental house cost?
The price of a drop-in shed varies depending on the standard, material and delivery method. Here is a quick overview:
Type of house | Approximate price range |
Attefallshus building kit | from about 100,000 SEK |
Attefallshus turnkey | from about 300,000 SEK |
Attefallshus with sauna/toilet | 350,000 – 600,000 SEK |
Attefalls house with loft | from about 400,000 SEK |
Attefalls house with basement | often over 600,000 SEK |
Don't forget that some detached houses require a building permit , especially if you plan to build closer to the plot boundary or deviate from standard heights.
👉 Want to read more? Please visit our page about attefallshus for more information, inspiration and frequently asked questions
📝 Building a temporary house – without a building permit?
Yes, a single-family home without a building permit is possible – but it requires a building notification to the municipality. You may only start building once you have received a start notice. This applies to both single-family homes and single-family extensions.
The Swedish National Board of Housing, Building and Planning is the authority responsible for interpreting rules and regulations. According to the Swedish National Board of Housing, Building and Planning, the house must be a "complementary building" and be built on a plot with an existing home.
🔮 What happens in 2025? – New rules for attefall are coming
According to several proposals , new housing regulations in 2025 could mean that the limit for housing units is raised to 50 square meters as standard - a long-awaited change for many.
There are also discussions about simpler rules for:
Extensions up to 30 sq m
Attefall extension conservatory
Construction on dotted land
Rules for carports, greenhouses, and roof shelters
It is therefore important that you stay up to date with the Swedish National Board of Housing, Building and Planning and your municipality before you get started.
📌 Summary: Checklist for those who are going to build an attefall
✅ Have you checked what applies in your municipality?✅ Are you going to build a detached house or an attached extension?✅ Have you thought about the maximum height, size and location from the plot boundary?✅ Do you need a building permit or is a building notification sufficient?✅ Does your detached house have a loft, toilet or sauna?✅ Do you follow the latest regulations from the Swedish National Board of Housing, Building and Planning?
