SIP or brick: which technology to build with in 2026

This is where most of the myths live, including some we used ourselves. A SIP wall gets compared with a wall of old solid brick and the numbers come out spectacular, along the lines of "150 mm of SIP replaces two metres of brick". For a house built today that comparison says very little: nobody raises two-metre walls of solid brick, they use modern ceramic blocks plus insulation.

The fair comparison is between complete walls, not materials. The panel's real advantage is that almost its whole thickness works as insulation, so a good thermal resistance comes at a thin wall. In masonry the block carries the load and the insulation comes from an added layer. Both reach an energy-efficient house; they simply get there differently, and the brick wall ends up thicker.

There is no answer valid for the whole market, and comparing the price of one SIP house with a per-square-metre figure found online is not a fair comparison: what contractors include differs too much. Our anchors are from €400/m² for the shell on a foundation, without windows, and from €900/m² turnkey, and what sits inside each is taken apart in the price guide and on the price list.

When you compare against a brick quote, check what each price contains: the foundation, the roof, the windows, the facade, the installations, heating, ventilation, floors, interior joinery, bathrooms and finishes. A low price for the shell says little about the cost of the finished house.

The saving with SIP does not come from the panel being a cheap material. It comes from fewer manual operations on site, from fast assembly, and from the low weight of the building, which sometimes allows a simpler foundation. A short cycle also cuts the costs that accumulate with time: rent during the build, site security, the risk of materials getting more expensive. But it does not follow that any SIP house comes out cheaper than any brick house: the architecture, the plot and the finishing level move that picture easily.

Brick has an obvious advantage here: its service history. Masonry buildings stand for decades and centuries, so the technology is easy to trust emotionally. SIP is much younger. Designed and maintained correctly it also lasts decades, but with one underlying condition: the timber-based elements of the panel have to stay dry.

The enemy of a SIP house is not frost or heat, it is water reaching, over a long time, somewhere it should not. That is why the roof connections, the facade protection, the sealed joints, the window fitting, the plinth waterproofing and the service penetrations matter. In that sense SIP forgives carelessness less: a good factory panel does not save a house where a bad detail lets water in for years. How long a SIP house actually lasts, and what shortens it, is taken apart in the article on service life. The rest of the technology downsides are in the article on SIP disadvantages.

Compare the materials as such and the advantage is brick's: ceramic brick is a non-combustible A1 material. A SIP panel is made of several materials, timber-based boards and polymer insulation, and those sit in other reaction-to-fire classes. We would not claim that SIP is inherently safer in fire than brick, because it is not.

The right question is not "does polystyrene burn" but "what fire resistance does the finished wall have and how sound is the design". In the finished house the panels are closed by protective finish layers, and the electrical installation, the position of heating equipment and the flues are designed separately. A correctly designed SIP house can meet fire safety requirements the way other lightweight timber structures do.

A SIP panel is a structural element: the OSB skins work together with the rigid core. We would not lean on advertising lines like "one panel carries X tonnes", though. The load on the wall of a house is more complicated than one attractive number: there are vertical loads, wind, snow, floors, openings and the panel connections. Load-bearing capacity is calculated for the specific house, exactly as with a brick one, where a very strong material does not rescue a badly calculated building.

For Romania the seismic question is a fair one. The low weight is an advantage: in an earthquake a smaller mass generates smaller inertial forces, and a panel house is a connected spatial structure. But it does not follow that a SIP house is "automatically earthquake-proof". Resistance depends on the design, the connections, the floors, the foundation and the seismic zone. The advantage exists; the engineer is the one who realises it. How exactly, and what nobody is allowed to promise you, is in the article on SIP houses and earthquakes.

SIP gets interesting when you want the house quickly, when you want most of the structure prepared in a factory, when you need an efficient envelope at a small thickness, when the lower weight helps on your plot, and when you want as few manual operations on site as possible and a predictable process from one contractor. And when you are building the kind of house the format suits: an A-frame, a barnhouse, a holiday house or a family house with rational geometry.

Not because brick is a poor material, but because for this kind of house SIP solves the same brief faster and with fewer unknowns. The detail on the panel and the assembly is on the technology page, and the designs themselves are in the catalogue.

The useful comparison does not start from theory, it starts from the same house. Pick a design from the catalogue or send us your own sketch and the plot details: we price the SIP version, show what the package contains and explain exactly where the difference in timeline and budget appears. Then the decision is made on figures rather than on promises.