Reference concept

DONSÖ ONE — Gothenburg Harbour Region

DONSÖ ONE is a 50-home reference project designed for a suitable sheltered location in the Gothenburg Harbour Region. It provides a concrete basis for site evaluation, engineering, project economics and partner discussions.

01 / Programme

50 homes, three sizes, two tenures

Home type	Count	Target area
DONSÖ 30	30	30 m²
DONSÖ 50	15	50 m²
DONSÖ 80	5	80 m²
Total	50	2,050 m²

Tenure

25 cooperative or owner-occupied homes and 25 rental homes. Property formation, VAT treatment, rent setting and the cost split between the two tenures are defined with specialist legal and tax input during project development.

Shared scope

Shared access decks
Utility connections
Energy infrastructure
Water and wastewater systems
Mooring and marine infrastructure
Emergency and service access

02 / Concept drawings

Site plan

A main access spine from shore serves five finger piers with ten homes each. Geometry is illustrative and depends on navigation, depth, wave exposure, fire access and permits.

Reference geography. Final location subject to site agreement and permitting.

Home modules

Three sizes sharing one wet core and one set of system interfaces. Layouts are concept only; external dimensions and areas require coordinated architectural and marine design.

Concept plan of the 30 square metre module with sleeping area, living and kitchen space, bathroom wet core, entry and storage, and a private deck. — **DONSÖ 30** — 30 m² target area. Compact one- or two-person home.

Concept plan of the 50 square metre module with bedroom, flex or work room, living and kitchen space, bathroom wet core, entry and storage, and a private deck. — **DONSÖ 50** — 50 m² target area. Permanent home with a flexible second room.

Concept plan of the 80 square metre module with three bedrooms, living and kitchen space, bathroom and laundry, entry and storage, and a private deck. — **DONSÖ 80** — 80 m² target area. Family layout requiring a dedicated marine stability solution.

Circulation, safety and service

Plan fragment showing an articulated shore gangway leading to a main access spine with branch decks to individual homes, with continuous edge protection indicated. — **Access decks** — Step-free routes from shore to every home. Widths and gradients to be verified.

Plan showing a step-free primary escape route along the access spine leading to a shore muster point, a fire and rescue vehicle standing area on land, and a rescue boat berth, with maximum travel distance shown as an item to be set by the fire strategy. — **Emergency and service access** — Routes, travel distances and rescue provisions must be agreed with the local fire and rescue service for each site.

Schematic section through the shared deck showing a walking surface over an inspectable service duct carrying power, potable water, wastewater, data and fire water, above a compartmented floating foundation, with metered connections to each home module. — **Technical infrastructure** — Power, potable water, wastewater, data and fire-water strategy routed through an inspectable service duct.

03 / Preliminary project logic

Four separate questions, often confused

What a project is worth, what the project company must finance, what DONSÖ earns and what DONSÖ needs are four different numbers. Only the first is derived from the cost model; the others are defined per project.

Layer	What it is	Status
Total project value	Indicatively in the order of 95–100 MSEK for 50 homes and 2,050 m², at the modelled 50-unit level of 46,964 SEK/m² including shared infrastructure, engineering, permitting, finance, contingency and margin.	Preliminary target-cost model
Capital required by the project company	The project value less pre-sales, long-term lease commitments and any public or grant funding, financed by the project company that owns the assets, which DONSÖ need not own.	Structured per project
DONSÖ revenue	A development fee, a margin on system delivery, and recurring service and monitoring revenue per installed home. Rates are commercial terms set per project.	Commercial model
Capital required by DONSÖ	SEK 1–3 million for the current engineering validation phase: supplier quotations, marine engineering, site and permitting work, and a conditional pilot agreement. Larger community projects are financed separately at project level.	Current development target

Where DONSÖ ONE sits on the cost curve. At 50 homes the model indicates roughly 9% below the traditional reference. A first 6–12 home pilot sits above it — approximately 48% above at 12 homes — because fixed project costs are carried by very few homes. The current target-cost model indicates cost competitiveness from approximately 30 units, subject to engineering validation, supplier quotations, site conditions and regulatory requirements.

Discuss a feasibility study