Add a sunroom for about a third of what an addition costs.

The Sophab is a curved, glazed arch that attaches to the house you already own — no new foundation, no demolition. Find your home on a map, put one on your wall, and see your own price. Five minutes, free, and nobody will call you.

See it on my house → How it works

Not a render

A local contractor is building the first one

This is a Sophab Solarium going up on our founder's own house in Fredericton, built by Westner Handwerk from the same drawings the tool on this site generates. It is where the cost model, the rib section and the arch geometry come from — not from a catalogue.

That it is a contractor building it, and not us, is the part that matters to you. It is the difference between a shape somebody drew and a set of drawings a builder can price, order from and put up.

A long timber-ribbed glazed arch attached to the side of a two-storey house, glazing on and the far end still open to the frame — Our first Sophab Solarium — Fredericton, summer 2026, built by Westner Handwerk. Glazed and standing; the end walls are still to come, and we'll show it again when they're on.

One honest note on the comparison above. A Sophab is a glazed, solar-tempered room — it is not an insulated, drywalled, furnace-fed addition, and the two are not the same thing to own. The estimate you get itemises both side by side, by trade, so you can judge the trade for yourself rather than take our word for the ratio.

A retrofit, not a rebuild

New room on the home you already own

A Sophab is a curved, glazed arch that attaches to your existing building — no demolition, no new foundation. It turns an outside wall into a bright, sheltered room and wraps your home in free solar warmth, working with the house you already have.

See it on your home →

Sustainable energy solutions

From a heat-pump cover to a home in a dome

Interested in harnessing solar energy but not sure where to start? We offer Solar Passive Habitats that range in size — from compact heat-pump covers, to full-house coverings and solar modifications tuned to your site.

Start with the smallest one, on us: grab the free build-it-yourself plan for the Heat-Pump Sophab — a canopy that shelters your outdoor unit from wind, snow and ice so it runs steadier in winter. Three sizes, for ground- or wall-mounted units.

Get the free heat-pump plan →

What it does for your home

Three ways a Sophab pays you back

🚪

Open new doors

The arch turns an outside wall into usable, sheltered living space — a sunroom, a mudroom buffer, a place to grow — adding room to your home without a full addition.

☀︎

Heat your building

The glazing captures low winter sun to pre-heat the house before your furnace or heat pump runs, and shades the high summer sun — free tempering, lower bills, no fuel burned.

🛡️

Slow the clock on your home

By sheltering the walls, windows and roof beneath it from sun, rain and freeze-thaw, the arch slows the weathering that ages them — and a full enclosure can nearly stop it.

The Sophab Arch

One idea, at every scale

The same curved, solar-passive shell — sized to your home, from a cover over a heat pump to a full Solarship: a whole home in a dome. It's the gothic arch brought into the modern world: here's the physics of how it works.

Sophab Solarium on a home — Sophab Solarium

RoofPhab — a flat structural roof deck with a greenhouse arch over part of it — RoofPhab — roof into a floor

Own a commercial building?

The same arch, underwritten like an investment

On a commercial building the arch does one of two jobs: over a flat roof it cuts heating, cooling and the billed demand that dominates a commercial bill — or against a dead wall it adds leasable square footage for about half the cost of a build-out.

Send us the building and we'll run the payback on your own rates and rents, itemised down to the line, with every assumption written out.

Sophab for commercial →

A glazed timber-ribbed arch over half a two-storey commercial roof, the rest left as open deck with cafe tables and shade sails