Tiny House Sizes: from 15 to 100 sqm with Prices and Floor-Plan Tips
The size of a tiny house decides the price, floor plan, number of occupants and heating costs – and whether it is still a tiny house under building law. This guide classifies the classes from 15 to 100 sqm, names prices for 2026 for each class and gives concrete floor-plan, occupancy and energy recommendations.
How big does a tiny house have to be? The answer decides almost everything: the price, the floor plan, the number of occupants, the heating costs – and even whether, in building-law terms, it is still a "tiny" house at all. Between the compact 15-square-metre model on wheels and the generously laid-out 100-square-metre small house lie worlds. This guide categorises the size classes from 15 to 100 m², names realistic prices for each class for 2026, explains from what point one strictly speaks of a mini-house rather than a tiny house, and gives concrete floor-plan, occupancy and energy recommendations for each size.
Which tiny-house sizes are there?
Short answer: Tiny houses usually range from 15 to around 50 m²; mini-houses and small houses follow with 50 to 100 m². Roughly four classes can be distinguished: the mobile tiny house (15–30 m²), the compact mini-house (30–50 m²), the comfortable small house (50–70 m²) and the full-fledged single house or small family house (70–100 m²). The larger the area, the lower the square-metre price, but the higher the total price and the building-law requirements.
Tiny-house and mini-house sizes with price orientation 2026
| Size class | Area | Turnkey price | Suitable for |
|---|---|---|---|
| Mobile tiny house | 15–30 m² | €55,000–110,000 | 1 person, couple (deliberately reduced) |
| Compact mini-house | 30–50 m² | €90,000–160,000 | couple, home office, second home |
| Comfortable small house | 50–70 m² | €140,000–230,000 | couple with child, seniors |
| Small family house | 70–100 m² | €200,000–320,000 | family, permanent main residence |
The price figures are guide values for turnkey houses including building services, but excluding land, parking space and servicing. The ranges are deliberately wide, because the fit-out standard, material quality and region strongly influence the price. Anyone who wants to understand the individual cost blocks in detail will find them in the tiny-house costs, which also quantify the hidden items such as servicing and permit. A broader overview is provided by our guide Modular house: prices & providers.
From what point is it no longer a "tiny" house?
Short answer: There is no legal definition for "tiny house" in Germany. As a rule of thumb: up to around 50 m² one speaks of a tiny house, above that rather of a mini or small house. More important than the label is the building-law treatment: as soon as a small house stands permanently and is lived in permanently, the same requirements apply as for any other building – building permit (Baugenehmigung), structural design, energy certificate and a permissible location. Whether 25 or 90 m²: building law gives no discount on the area.
The term "tiny house" is therefore more a way of life than a legal category. The mobile tiny house on wheels takes a special position, because it is registered as a trailer – but here too building law applies as soon as it is lived in stationarily. The exact permit questions, the differences between the inner and outer zone (Innen- und Außenbereich) and the type of use are clarified by the guide on tiny-house pitch & building law. Anyone planning over 50 m² should also engage with the single-house concepts .
Compare area fairly: living space instead of base area
When comparing sizes, pay attention to whether offers state the pure living space or the base area including wall thicknesses and sleeping gallery. A sleeping loft in many cases only counts to a limited extent towards the countable living space, even though it creates room in everyday life. Have the area calculation explained to you in order to compare two houses really fairly.
Floor-plan tips per size
Short answer: The smaller the house, the more important a well-thought-out floor plan: up to 30 m² the concept lives on multifunctional furniture, a sleeping gallery and plenty of storage in walls and stairs. Between 30 and 50 m² a full-fledged bedroom becomes possible without giving up an open kitchen and living area. From 50 m² separate rooms, retreats and a larger bathroom can be realised. Always plan the floor plan from your actual daily routines, not from an ideal show house.
What each area makes possible in the floor plan
| Area | Sleeping | Kitchen/living | Bathroom |
|---|---|---|---|
| 15–25 m² | Gallery / folding bed | combined, compact | wet cell |
| 25–40 m² | own sleeping area | open kitchen + living | full bathroom |
| 40–60 m² | 1 bedroom | separation possible | bathroom + possibly guest WC |
| 60–100 m² | 2–3 rooms | generously separated | bathroom + guest WC |
Multifunctionality on a small area is not a compromise but the design principle: extendable tables, beds over storage, stairs with drawers. From around 50 m² the focus shifts from clever use of space towards classic room division. Concrete floor-plan examples and inspiration for small houses can be found in our tiny-house floor plans.
Find the right size – with real offers
Which area really suits your life shows up best in concrete floor plans and prices. Request offers from suitable manufacturers in your desired size free of charge and without obligation, and compare specification and fixed price.
How many people fit into which size?
Short answer: As orientation: up to 25 m² one person lives comfortably, a couple lives here deliberately reduced. 30 to 50 m² are well suited for couples and, with a well-thought-out floor plan, for a couple with a small child. From 50 to 70 m² there is room for a couple with a child or two people with home offices, and 70 to 100 m² permanently support a small family. What is decisive is less the pure number of square metres than the layout and the number of lockable retreat rooms.
- 1 person: comfortable from 15–20 m², with a home office better 25–35 m².
- Couple: 25–40 m² for deliberately reduced living, 40–60 m² for more comfort.
- Couple with child: from 50 m² with an own children's room, from 70 m² permanently relaxed.
- Family: 80–100 m² for separate sleeping rooms and a shared living area.
- Plan retreat rooms: from two occupants, every lockable room counts for more than every additional square metre of open area.
The most common misjudgement is choosing the area too tight for daily use. What seems charming on holiday can feel cramped in continuous operation with a home office, visitors and bad weather. If you plan permanently as a couple or with a child, one size class more is often the wiser investment. Anyone still wavering should try out living on a small area in advance – how that works is explained by the guide on buying a tiny house.
Heating and energy consequences of size
Short answer: A larger area means more volume to heat and thus higher heating costs – but not linearly, because compact, well-insulated houses are often more efficient per square metre than loosely laid-out ones. A 15 m² tiny house can be kept warm economically with a small electric or infrared heater; from around 50 m² a heat pump pays off, and over 70 m² modern heating technology and a good insulation standard are a must to keep the energy costs within bounds. Investments in insulation and efficient technology pay off more strongly as the area grows.
Recommended heating technology by size (guide values)
| Area | Sensible heating technology | Energy demand |
|---|---|---|
| 15–30 m² | Infrared, compact electric heater, small stove | low, but mind the electricity price |
| 30–50 m² | Compact heat pump, pellet stove | moderate |
| 50–70 m² | Air heat pump, possibly with PV | higher, controllable with efficiency |
| 70–100 m² | Heat pump + good insulation, PV recommended | like a small prefab house |
Photovoltaics and a small storage lower the ongoing costs increasingly noticeably as the area grows and can cover a large part of the demand in sunny months. Bear in mind: a small, poorly insulated house can cause more heating costs per square metre than a larger, well-insulated one. Therefore never skimp on the building envelope. Anyone planning over 70 m² is, in terms of price and energy, already in the range of compact prefab houses – a comparison is worthwhile beyond the tiny-house house types .
The size can hardly be changed later
Unlike remodelling a large house, the area of a tiny house or mini-house is practically fixed – extending it afterwards is rarely sensible and, with the mobile model, impossible because of the weight. Therefore choose the size with an eye on the coming years, not only on the current life situation. Better one class larger once than permanently too tight.
The right size is always a compromise of budget, number of occupants, building law and energy costs. Form a picture with concrete floor plans and offers before you commit – that way you avoid the most expensive mistake, namely building too small or unnecessarily large in the end. Start with the tiny-house floor plans and offset the figures against the tiny-house costs . A general overview of models and providers is offered by the tiny house. How to use the chosen area cleverly is shown by the guide Furnishing a tiny house, and how the terms around small-scale living connect is explained by the guide on the mini-house. With our calculator you can calculate prefab house costs and play through different fit-out levels individually.
From 20 to 100 m² – the right size at a fixed price
Whether a compact tiny house or a comfortable small house: a transparent offer comparison shows which area suits your budget and life situation. We connect you free of charge and without obligation with suitable manufacturers with a clear construction and specification of works.
What does your dream house really cost?
Request suitable quotes from vetted manufacturers for free and compare the prices per square metre for your construction project.
Compare house prices nowImportant questions briefly explained
The most common price questions around Tiny House Sizes – answered concisely by the Prefabricated House editorial team (as of 2026).
