KvarterA housing co-op’s noticeboard, bookings and meetings in one app.

Kvarter AS is an Oslo startup that makes software for borettslag, the resident-owned housing co-ops of 40 to 400 flats found on almost every street in the city. In 2024 a typical co-op still ran on a cork board by each entrance, a paper sheet on the laundry room door, a spreadsheet on the chair’s laptop and an annual meeting that a third of the flats attended.

Kvarter had a booking tool used by nine co-ops. The brief was one app a whole co-op would open every week: notices from styret, the board, plus shared spaces, fault reports and the annual vote. It had to work for a student renting a room and for a widow who has lived in the same flat since 1962, and it could not leave out the flats that would never install it.

1. 1

   Flat numbers first, names by choice

   Everyone appears by flat number, H0204, unless they choose to show a name. We tested names by default with two co-ops, and four residents in ten switched them off within a week. Several said they did not want neighbours counting how often they did laundry. Flat numbers are what people already wrote on the paper sheet, so nobody had to learn anything new.

2. 2

   Styret’s notices and neighbours’ posts live apart

   The cork board put a water shut-off next to a lost cat and last winter’s Christmas tree collection. Our first prototype kept that in a single feed, and in testing half the residents scrolled past the shut-off. Now notices from styret sit in their own list, set in brick, pinned while they matter and taken down when they are over. Everything else goes on the neighbours’ noticeboard.

3. 3

   Styret posts once, and every flat hears

   About one flat in five in the pilot co-ops would never install an app. Rather than chase them, a notice goes out three ways from the same form: as a notification, as a text to the flats that asked for one, and as an A4 sheet for each stairwell, ready to print. The paper is part of the product, not a fallback.

4. 4

   The booking sheet keeps the house rules

   Rules used to be taped to the laundry room door and argued about on the stairs. In Kvarter they are part of the grid: two hours a day per flat, three nights in the guest flat, closed while the water is off. When the app says no, it says why in one sentence. We tried having styret approve bookings instead; no chair wanted that job.

5. 5

   An identity taken from the buildings

   The colours come from a 1962 brick block at dusk, and each has one job: brick is styret, moss is yours, window yellow is new. Fault categories are drawings rather than photos, so reporting a broken light takes two taps and nobody has to photograph their landing. The mark is four windows with one lit.

Kvarter launched the app in 14 co-ops in January 2026, 2,310 flats in all, and has signed 31 more since. Fjellhagen, the 64-flat pilot on the cover, held its first annual meeting with digital voting in May: 58 flats voted, against 23 the year before.

We built the interface in React with Kvarter’s two engineers and handed over the identity, the illustration set and the component library in November 2025. They have since added the party room and a key register using the same parts.