How much does a prefab house cost in 2026? Real prices, types and what nobody tells you

How much a prefab house costs per square metre

A prefab house is no longer the “cheap” option: it is a different way of building. It is made in a factory, with fewer surprises and less time on site, and the saving compared with traditional construction is usually between 10% and 25%, not half. What really sets the price is the quality of the materials and finishes, not the fact that it is prefabricated.

Based on the quotes we are seeing in 2026, these are the indicative price ranges for the house itself (house only, excluding land and paperwork):

In real houses: a 90 m² home with two bedrooms costs between €110,000 and €180,000 for the house; a 140 m² home with three or four bedrooms, between €170,000 and €300,000. And then you have to add everything covered in the following sections.

What the manufacturer’s price includes (and what it doesn’t)

Two quotes with the same price can differ by €40,000 in the end. Before comparing, ask each manufacturer for a written breakdown.

What is usually included

• Structure and envelope: walls, roof, insulation and external joinery.
• Internal services: electrics, plumbing and drainage up to the edge of the house.
• Standard finishes: flooring, paint, bathroom fittings and kitchen in the manufacturer’s standard range.
• Transport and assembly up to a set distance (watch out for extra kilometres and special cranes).

What is almost never included

• Foundations (slab or footings): between €6,000 and €20,000 depending on the ground and size.
• Utility connections for water, electricity, drainage or a septic tank: €3,000 to €15,000; on remote plots, much more.
• Design and site supervision (architect and quantity surveyor): 6% to 10% of the construction budget.
• Building permit and ICIO tax: around 3% – 5% of the budget, depending on the municipality.
• VAT: 10% if it is a dwelling, 21% if it does not meet the requirements (section 8).
• Site works: fencing, access, earthworks, pool, porch, garage.
• New-build deed, land registry and occupancy certificate (cédula).

The 8 factors that drive the price

1. Construction system and materials. Light steel is the cheapest; concrete the most durable and the most expensive.
2. Size and shape. A rectangular floor plan is cheaper per m² than an L-shape or two storeys. Above a certain size the price per m² comes down.
3. Quality of finishes. Between the standard and the high-end range there can be a €300/m² difference.
4. Degree of customisation. A catalogue model is cheaper than a bespoke design; changes once manufacturing has started are expensive.
5. Energy efficiency. Aerothermal heating, underfloor heating, solar panels or triple glazing raise the initial price and cut the bills for life.
6. Ground and foundations. A sloping, rocky or hard-to-reach plot can double the cost of the preliminary works.
7. Location. Transport, crane and permits vary a lot between the Barcelona metropolitan area, inland and the coast.
8. Extras. Porch, garage, pool and home automation are what push the final budget up the most.

Calculator: what it will really cost you

Fill in the details and we give you a turnkey estimate, with a breakdown. These are indicative figures for Catalonia in 2026; they help you see whether the project is viable before asking for quotes.

Assumptions: design and site supervision 8% of the house cost; permit and ICIO 4%; foundations €110/m² × difficulty; utility connections €6,000 × difficulty; 10% VAT on house, foundations and extras (21% on fees); notary, registry and occupancy certificate €2,500; if you buy land, 10% ITP (Catalonia) and €1,500 in costs. Contingency 5%.

Modular, timber or concrete: which suits you

At Profinca, when the goal is a main home and future resale, we usually recommend timber or concrete: they get the best valuations and cause the fewest problems with the mortgage.

The land: which plots qualify in Catalonia

This is the most expensive mistake of all. For planning purposes, a prefab house on foundations is a dwelling like any other: it can only go where the planning rules allow a dwelling to be built.

• Consolidated urban land: the safe option. It has services (water, electricity, drainage, access) and a defined building allowance.
• Developable land: only if the sector has been developed and serviced. If not, you could wait years.
• Non-developable (rural) land: in Catalonia, as a general rule, no new dwellings can be built. The exceptions (ties to a farm, listed masies) are very limited.

Before reserving a plot, ask for three things

1. Planning certificate (certificat d’aprofitament urbanístic) from the town hall: what you can build, how many m², how many storeys, setbacks.
2. Land Registry extract (nota simple) from the Land Registry: charges, easements and confirmation that the seller is the owner.
3. Geotechnical survey (€600-1,500): the type of ground defines the foundations and can change the budget by tens of thousands of euros.

Permits, project and paperwork

The order matters. This is the full route for a prefab house on foundations in a Catalan municipality:

PEM = material execution budget. Serious manufacturers have their own or a partner architect and handle the permit; even so, you are the one who signs with the town hall, and the planning responsibility is yours.

Taxes: VAT, AJD and IBI

10% or 21% VAT

Building a dwelling is taxed at 10% when the contract is a works contract with the manufacturer, the house is permanently fixed to the ground and is intended as a dwelling. If you buy the house as movable property (no foundations, no permit) or as a module for office or tourist use, VAT is 21%. On a €180,000 house, that difference is almost €20,000.

If you buy land

From a private seller: 10% ITP in Catalonia (11% on the part above one million). From a company or developer: 21% VAT plus AJD.

When registering the new build

AJD (stamp duty) on the value of the works: 1.5% in Catalonia. This is what lets you register the dwelling at the Land Registry and apply for the mortgage.

Every year

IBI (property tax) according to the cadastral value assigned once the works are declared (form 900D, to be filed within the following two months).

How to finance it: the self-build mortgage

There is no such thing as a “prefab house mortgage”: what you sign is a self-build mortgage, the same as for a traditional build. It works like this:

• The plot must be yours and registered in your name; the bank does not finance the plot together with the house, except in rare cases.
• It finances up to 80% of the final appraised value (project and land), not of the manufacturer’s quote.
• The money is released against works certificates: part on signing and the rest as the surveyor certifies that work has been done. This clashes with manufacturers who ask for 40-60% up front: negotiate the payment schedule before signing with either of them.
• During the works you pay interest only (grace period) and the full instalment starts on completion.
• You need the building permit granted before signing: no permit, no mortgage.

Real timescales (not the brochure’s)

The advantage over traditional building (18-24 months) is real, but the bottleneck is not the factory: it is the municipal permit.

Mistakes we see every week

1. Buying the plot before knowing what can be built on it. First the planning certificate, then the deposit.
2. Comparing prices without VAT or transport. Ask for all quotes with the same scope.
3. Paying large advances to a manufacturer without a guarantee. Insist on a bank guarantee or deposit insurance, as in a new development.
4. Forgetting the foundations and utility connections. They are the first thing done and the last thing budgeted.
5. Signing without an approved mortgage. Make the contract with the manufacturer conditional on the financing being granted.
6. Thinking about today and not about resale. A registered dwelling with an occupancy certificate and ten-year insurance sells like any other; a “mobile” one without papers does not.

Checklist before signing with the manufacturer

• Fixed quote including VAT, transport and assembly on your plot.
• Detailed specification: brands, insulation thicknesses, joinery, equipment.
• What about the foundations: do they build them or a third party? Who is liable if they don’t fit?
• Payment schedule compatible with your self-build mortgage.
• Guarantee or insurance covering the advances.
• Delivery date with a penalty for delay.
• Warranties: 1 year finishes, 3 years habitability, 10 years structure (Building Act, LOE).
• Expected energy performance certificate (aim for A or B: it counts for green mortgages and resale).
• References: visit at least one house delivered more than two years ago.
• The contract conditional on the permit being granted and the financing approved.