Frequently Asked Questions

Strom Series is three pre-designed architectural homes by architect Magnus Ström, built on site at a fixed price. Strom 01 and Strom 02 are single-storey, Strom 03 has two floors. You choose the home, the size and the specification. We build it on site and hand it over turnkey. From SEK 8,995,000.

Ola Mattisson and Magnus Ström. Magnus Ström is responsible for the architecture: the homes, the proportions, every material and every system. Ola Mattisson is responsible for the business — land, contracting and delivery — and he is your counterpart through the whole project.

That is the idea behind Strom Series: architecture at Magnus Ström's level, delivered with a property developer's grip on price and time.

Magnus Ström is a Swedish architect with a practice in England. He founded Ström Architects in 2010. The practice has twice won House of the Year at the British Homes Awards and has built in the UK, Sweden, Spain, the USA and the Caribbean. Its houses are published in Wallpaper* and Dezeen.

Ola Mattisson is a property developer who has built architect-designed houses in some of Stockholm's most sought-after areas since 2008 — one won Nacka Municipality's architecture award, voted for by residents, another made the cover of Residence. He and Magnus Ström have worked together for ten years and built several houses together.

Yes. The best way to understand what we deliver is to see a house being built. Book a call and we'll arrange a visit.

Three. Strom 01 is a single-storey home with two, three or four bedrooms, 126–173 m² living area. Strom 02 is a single-storey home in an L with three or four bedrooms, 171–190 m² living area. Strom 03 is a two-storey home with five bedrooms, 224 m² living area, with a garage and carport. All three are drawn by Magnus Ström and fully engineered.

The homes run from 126 to 224 m² of living area. Building area (BYA) is the figure that counts against the detailed development plan.

If your plot has a limit in the development plan, tell us when you book a call and we'll see which home fits.

The plans are finished. That is what makes nine to twelve months at a fixed price possible. What you choose is the home, the size, the specification and the options. Strom 02 comes with three variants of the master bedroom.

The materials are chosen by Magnus Ström and are the same in every home — they are what holds the whole together. If you want a house drawn only for you, Ström Architects takes bespoke commissions.

The house is complete as it is. The three packages give a different specification, one at a time or together, each at a fixed price.

Materials gives tiled floors throughout, lime-plastered walls, a shadow gap instead of skirting, an oak-veneer kitchen, internal doors with no visible frame and a pivot door at the entrance. Indoor climate gives ground-source heating, heat-recovery ventilation, cooling in the bedrooms and motorised blackout blinds. Acoustic-rated bedrooms and a plastered acoustic ceiling in the living areas. Smart home brings lighting, shading, climate, locks, alarm and audio into one system.

The walls are 378 mm thick with 215 mm of mineral wool, a U-value of around 0.15–0.18 W/m²K. The concrete slab sits on 300 mm of EPS insulation. The windows are triple glazed in aluminium with a thermal break.

The price includes an exhaust air heat pump with heat recovery and water-based underfloor heating throughout. Indoor climate gives ground-source heating and heat-recovery ventilation, which recovers the heat from the extracted air and filters the air coming in.

On site, on the plot, to our own construction documents — from architecture through to electrics and plumbing. We appoint selected building contractors for each build. They build to our documents and our specification, and the result is ours to answer for. What Magnus Ström drew is what gets built.

One contract: a turnkey contract at a fixed price under ABS 18, the Swedish standard contract for house building for private clients, drawn up with the Swedish Consumer Agency. Strom Series is responsible for the whole house until the final inspection is approved, and the Swedish Consumer Services Act always applies in your favour.

Nine months for Strom 01 and Strom 02, twelve for Strom 03. Counted from approved building permit and completed groundworks to moving in, and pouring the slab is part of it.

The permit and the groundworks depend on the plot and the municipality. What we promise starts when the groundworks are done. A bespoke house takes three to five years from plot to moving in; in our homes the design work is already done.

In Scandinavia — Sweden, Denmark and Norway. The prices on this site are for Sweden. For a plot in Denmark or Norway you get a price for that plot; building regulations and contracts differ between the countries, so we take it country by country. Tell us where it is when you book a call.

The responsibility is ours. The documents are ours, the contractor builds to them, and we put right whatever departs from the specification. You have one counterpart through the whole build, and the house is approved by an independent inspector before you pay the last ten per cent.

Yes. Transport and logistics to plots that are hard to reach, in the archipelago for instance, cost more, and the cost differs from plot to plot. We assess each plot on its own, and the cost is in your quote before we sign the contract.

Strom 01 from SEK 8,995,000, Strom 02 from SEK 11,995,000 and Strom 03 from SEK 16,995,000. The price depends on the home, the number of bedrooms and which specification and options you choose. Every price is fixed, and you see what the specification and the options cost before you decide.

Strom 01 costs SEK 71,400 per square metre of living area with two bedrooms, 70,300 with three and 68,800 with four. Strom 02 costs 70,200 with three bedrooms and 68,800 with four. Calculated on the house price; groundworks are additional, between SEK 600,000 and 800,000.

The price per square metre falls as the house grows, because what a larger house mostly adds is bedrooms — the cheapest square metres in the house.

Strom 03 costs SEK 76,000 per square metre of living area, but the price includes a garage for two cars and a carport, which are not counted as living area. Measured across everything built, Strom 03 costs around SEK 59,700 per square metre — the lowest of the three.

The price is a complete house, ready to move into: a kitchen from our joinery workshop, bathrooms, a fireplace, underfloor heating, smart lighting and an EV charger. The homes are fully engineered — the architecture, structure, electrics and plumbing were drawn once. You are not paying for years of drawing work.

If you are comparing with a cheaper house, look at what its price per square metre covers — groundworks, connections and a good part of the work on site are often additional.

A complete house, ready to move into, on a concrete ground slab. Everything is chosen by Magnus Ström: triple-glazed windows and large aluminium sliding doors, pre-greyed timber cladding, single-plank oak flooring, flush solid internal doors, a kitchen built in our joinery workshop, fully integrated appliances and an induction hob with built-in extraction, tiled bathrooms, a walk-in shower with a linear drain and a wall-hung WC, a bath in the shared bathroom, a fireplace set into the wall with the chimney on the outside, an exhaust air heat pump with heat recovery, water-based underfloor heating throughout, smart lighting and an 11 kW EV charger.

The groundworks sit outside the house price. They get a fixed price for your plot after a geotechnical survey and stand as their own line in the same contract — on a normal plot between SEK 600,000 and 800,000 depending on the size of the house. The plot, utility connection fees and the building permit are additional.

The groundworks get a fixed price for your plot. We carry out a geotechnical survey before the contract is signed, and they stand as their own line in the same contract as the house — one counterpart, one contract.

What is included: site set-up, topsoil stripping, excavation and levelling, the compacted gravel bed under the house, drainage, stormwater to a soakaway, water, sewer, electricity and fibre brought to the house up to 15 metres, backfilling and rough grading three metres around the house.

On a normal plot the groundworks come to between SEK 600,000 and 800,000 depending on the size of the house. By a normal plot we mean a drivable road up to it, a slope under 5 per cent, friction soil without rock or clay that needs piling, municipal water, sewer, electricity and fibre at the plot boundary within 15 metres, no trees thicker than 15 centimetres inside the building area, no demolition, and room to store materials on the plot.

Rock, piling, longer service runs, tree felling, the driveway and landscaping are priced separately once the plot has been surveyed.

Strom 03 has a garage and a carport. A pool with a terrace is an option. Sliding doors with minimal profiles and external solar shading are an alternative specification, under Materials and Indoor climate. A garage or store for Strom 01 and Strom 02: talk to us.

You are paying for a house drawn by Magnus Ström, built on site to complete construction documents. The price is possible because the design work was done once and is used in every home we build. In a bespoke house you pay for it every time.

Yes, five. The plot. Groundworks — a fixed price for your plot after a geotechnical survey, on a normal plot between SEK 600,000 and 800,000; rock, piling, long service runs, landscaping and the driveway are priced separately once the plot has been surveyed. Connection fees — for water and sewerage to the municipality, for electricity and fibre to the network operators. The amounts depend on the municipality and the plot. Weather protection — if the house is built through the winter months it may be needed, and it is priced once the start date is set. The building permit — we prepare the drawings for your plot and submit the application. That work is charged for, and the municipal fee is additional.

Before the contract we carry out the geotechnical survey, so you know the whole cost. The groundworks stand as their own line in the same contract as the house — one counterpart, one contract.

You pay as the house is built. Each part is paid when the corresponding stage is finished and checked:

• 10 % at contract
• 30 % once the municipality approves the start — ordering windows, cladding and other items with long lead times
• 10 % when the concrete slab is poured
• 20 % when the shell is complete — cladding, walls, roof and windows in place
• 20 % when the floors are laid, the walls painted and the doors hung
• 10 % after an approved final inspection, when you move in

The last ten per cent you pay only once an independent inspector has approved the house against the specification.

Yes. A house built on site on your own plot is mortgaged like any other house. During the build most people use a building credit (byggnadskreditiv) — a temporary loan paid out as the build progresses, where you pay interest only on what has been drawn. Once the house is finished and valued it converts to an ordinary mortgage. Talk to your bank early, preferably before you sign a contract.

Ola Mattisson. He is your counterpart from the first call until you move in: the contract, the timetable, the money and the decisions along the way. Magnus Ström is responsible for the architecture and the specification; coordinating architect and builder is our work. One counterpart, one contract, one responsibility.

Ola procures the building contractor and drives the build against the timetable; every stage is checked before you pay. At the end an independent inspector approves the house.

No. The design work is done and the materials chosen. You choose the home, the size, the specification and the options; we build and coordinate everyone involved, through to a turnkey house.

1. Book a call. We talk, you tell us about your plot and what you want.

2. Choose the home. Home and size, Materials, Indoor climate or Smart home, and options. We go through what is included and what each choice costs.

3. Contract. A fixed price and a clear timetable.

4. Building permit. We produce the permit drawings from our own drawings and submit the application for you.

5. Groundworks. The plot is made ready to build on.

6. The build. Nine months for Strom 01 and Strom 02, twelve for Strom 03, from completed groundworks. You pay as the house is built.

7. Final inspection and moving in. An independent inspector approves the house. Then you move in.

We get in touch and arrange a time. You tell us about your plot, if you have one, and what you are looking for; we tell you about the homes, what is included and what it costs. If it fits, we go on to home, size and choices, so you get a clear picture of what your home would cost.

That depends on the municipality. We produce the permit drawings and submit the application for you straight after the contract, and what we promise starts when the permit is granted and the groundworks are done: nine months for Strom 01 and Strom 02, twelve for Strom 03.