The housing thesis
From invisible vacancy to living homes.
Europe's biggest household bill meets Europe's biggest waste of buildings. Unlocking Housing maps who holds empty stock, why it stays empty, who bridges the gap, and the seven ways someone can stay — from a weekend retreat to a lifetime right to live there.
The biggest item on most people's bill is housing. And yet Europe simultaneously holds an enormous stock of housing that sits empty — villages depopulated by rural exodus, islands abandoned, apartments locked in speculation. We are working to unlock it.
This isn't only a German-speaking story. Most countries with a depopulating countryside have their own name for it:
Sources: Treccani, Vocabolario online, entry "spopolamento" [A], accessed 2026-08-19, https://www.treccani.it/vocabolario/spopolamento/ · Sergio del Molino, La España vacía, Turner, 2016 [B]; term's public-discourse history per es.wikipedia.org/wiki/España_vaciada [B], accessed 2026-08-19. Portuguese and Greek equivalents were researched but not confirmed with a citable source in this pass (web-search budget exhausted mid-research; see the result report) — left out rather than guessed.
The model and its people
The map is only the left-hand side. What makes a building become housing is the chain from owner through steward to resident — and the institutions that hold data or money at each step.
The whole ecosystem
Read it clockwise. A building has someone who holds it; the holder has a reason it stays empty — the four reasons are in the table below, since they are reasons and not a group of people; a bridging institution dissolves that reason; someone moves in — and gives stewardship, care or rent back to the holder. The map itself only feeds the loop: public data in, named candidates out.
On a narrow screen the diagram scrolls sideways. Every group is written out in full, as plain lists, in the section directly below; the four reasons a building stays empty are in the table just beneath the diagram.
Known lag: the plain list's "Who bridges" group now carries a fifth entry (Genossenschaftskreis, added 2026-08-19) that this hand-drawn diagram doesn't show yet — redrawing the diagram's bridge cluster is a follow-up, not done here.
Not a stakeholder — a set of reasons
Four reasons show up when we ask why a building that could be housing isn't. They belong to the holder, not to a group of their own — which is why they sit in a table here rather than in the loop above.
| Reason it stays empty | What the holder is actually facing | What dissolves it | How hard |
|---|---|---|---|
| Emotional attachment | An owner won't rent because of what the place means to them — memory, family history, reluctance to let a stranger live there. | The bridging institutions (community house steward, Zwischennutzungs-agentur) build the relationship an owner needs before they'll say yes. | Harder |
| Aufwand — too much hassle | Listing, vetting and maintaining a tenant relationship feels like more effort than the empty building is worth. | The tenure ladder's low-commitment entry rungs (a retreat stay, a test stay), plus bridges that absorb the paperwork and vetting. | Easy |
| Fear of tenancy law | Austrian tenancy law (MRG) protects tenants and is hard to undo once a lease looks like ordinary tenancy. | Short-duration instruments — Prekarium · Bittleihe — sit outside MRG protections at the entry rungs, where trust hasn't been built yet. |
Easy-ish |
| Doesn't know it's wanted | Nobody has ever asked, or the ask never reached them — the owner doesn't know anyone wants what they have empty. | The map itself, plus the bridging institutions' outreach role: visibility and a named contact, not paperwork. | Harder |
Each reason is written out in full — how we address it, how easy that is, and where the reason comes from — in the collapsed note at the bottom of this page.
The same model, as a plain list
The diagram and the table above are one shape for this. Here is the same content as five plain lists, so nothing depends on reading a diagram correctly.
The trust-holder / broker / insurer relationship these two roles perform is exactly what a real, ready-to-use stewardship agreement template formalizes.
Genossenschaftskreis (cooperative circle): a fifth bridging model, distinct from the trust-holder/broker pattern above. A closed circle of up to 80 adults forms around roughly eight desirable-location properties; members contribute unevenly by design (money, labor, or competence, not equal shares), governed by a rotating Kreisen (circling) practice rather than a single board. Genossenschaftsverträge (cooperative-membership contracts) delegate risk and set out who stewards which property, under a shared code of ethics ("leave a better trace," trusted tenants act as stewards, clear membranes on who joins). Closer in spirit to the member-governed Syndikat/habiTAT/Genossenschaft entry than to the trust/broker pair, but organized around a fixed circle and a fixed property set rather than an open syndicate.
Tenure by duration
The site's first question. Each rung is a different legal instrument in Austria — the ladder is deliberately continuous, so someone can enter at a weekend and end at a lifetime right without ever leaving the system.
| Rung | Likely Austrian instrument | Turns into a problem when… |
|---|---|---|
| Retreat / test stay | Beherbergungsvertrag — guest, not tenant | it repeats until it looks like living there |
| Short-term, extendable | Prekarium · Bittleihe ABGB §974 | rent flows regularly → becomes tenancy |
| Season / project | befristeter Mietvertrag · Untermiete | minimum-duration rules bite |
| Ordinary tenancy | Mietvertrag under MRG | owner wanted flexibility they no longer have |
| Permanent home | ownership · Genossenschaft · syndicate | capital is the barrier |
| Lifetime right to live | Wohnungsgebrauchsrecht · Leibrente ABGB §1284 · Ausgedinge→ the stewardship agreement template | care obligations are promised but unregulated |
| Legacy / succession | Stiftung · syndicate veto share · Genossenschaftsverträge (Genossenschaftskreis)→ the stewardship agreement template | nobody wrote down what happens next |
Instruments are research, not legal advice — the detailed check on Überlassung, the 2026 Mietenpaket changes, and where neighbourly help becomes regulated care is running now and will replace this table's shorthand.
Four reasons show up when we look at why a building that could be housing isn't. We can address some of them today. Others need people, not code — and this page says so plainly rather than overselling what a map can do.
An owner won't rent because of what the place means to them — memory, family history, reluctance to let a stranger live there.
How we address it: the bridge institutions (community house steward, Zwischennutzungs-agentur) exist to build the relationship an owner needs before they'll say yes. Trust before technology — no map or legal instrument substitutes for that.
Harder — needs relationship-building, not a legal or technical fixGrounded directly in the owner's own working notes (Tana, 31 Jul 2026, "Unlocking potential housing resources for community use"): second homes not rented out, "due to emotional reasons or Aufwand."
Even an owner willing in principle won't act if listing, vetting, and maintaining a tenant relationship feels like more effort than the empty building is worth.
How we address it: the View-3 tenure ladder exists exactly so low-commitment entry points (a retreat stay, a test stay) reduce the Aufwand barrier at the point of entry; the bridge institutions absorb the paperwork and vetting an owner would otherwise face directly.
Renovation capacity: Two renovation companies — one in Vienna, one in Graz — are soft-agreed partners for bringing houses back into use. Full names and public links pending.
Easy — already addressed by existing designGrounded directly in the owner's own working notes (Tana, 31 Jul 2026, "Unlocking potential housing resources for community use"): second homes not rented out, "due to emotional reasons or Aufwand."
An owner hesitates because Austrian tenancy law (MRG) is protective of tenants and hard to undo once a lease looks like ordinary tenancy.
How we address it: the ladder's short-duration instruments (Prekarium, Bittleihe) sit outside MRG tenancy protections entirely, reducing an owner's legal exposure at the entry rungs where trust hasn't been built yet.
Inferred from the project thesis, not a direct note — a Tana search of the UnlockingHousing tree (legal › methods › Austria, kinds-of › housing-to-be-unlocked, and text search for "tenancy law" / "Mietrecht" / "MRG" / "fear") found no node stating this reason directly.
An owner simply doesn't know anyone wants what they have empty — no one has ever asked, or the ask never reached them.
How we address it: the map itself, plus the bridge institutions' outreach role, close this gap — visibility and a named contact, not paperwork.
Harder — requires outreach and relationship-building, not a one-time technical fixInferred from the project thesis, not a direct note — the same Tana search (legal › methods › Austria, kinds-of › housing-to-be-unlocked, and text search for "doesn't know it's wanted" / "outreach" / "aware") found no node stating this reason directly.