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Low energy housing at Jåtta in Stavanger

Published by: Per Anda / NAL Last updated 19.04.2013

April arkitekter won Europan 7 with their project at Jåtten Øst in Stavanger. In cooperation with Norwegian Wood two projects were developed, Jåtten Øst B7 and Jåtten Øst B8. The residential area (Jåtten Øst B7) was completed in 2008. Hothouse og rekkehusene (Jåtten Øst B8) is at a preliminary stage. Developer is trying to adapt the project to market, and project is on hold.

Short facts

  • Architect: April Arkitekter AS
  • Project duration: 2005 - 2008
  • Area: Type A: 137 sqm over three floors and basement (50 units). Type B: 157 sqm over two floors + basement (23 units).
  • Environmental goal: Energy label B , Low energy house class 2

Project description

The Jåtten Øst housing project consists of two parts, B7 and B8. B7, which is now completed, was built after April Arkitekter won the Europan 7 competition in 2003, and is partly based on the winning project.  B7 comprises 20 row houses with a total of 73 units, all with a private garden on one side and a roof terrace on the other. There are three playgrounds, each with a communal greenhouse. B8 is based more closely on the Europan project, with 45 flats sharing five large communal spaces, and a row of 40 lower houses where two and two share a number of glazed greenhouse spaces.

Social sustainability has been as important as environmental sustainability in the project, which nonetheless has achieved low-energy standards even with a relatively large proportion of glazing.

Energy efficiency
Energy target: class B
Energy efficient form of development (row houses as an alternative to detached houses), Space efficient planning. Well insulated building envelope  with superinsulating windows and minimal cold bridging. Focus on reduced air leakage with courses for craft workers and two airtightness tests for each apartment before practical completion certification. Balanced ventilation with high efficiency heat recovery. Displays (meters in each apartment) indicating energy consumption for heating, hot water and electricity. Energy supply based upon district heating with gas (fossil fuel).

Timber technology
Site built, four storey timber framing. Cross-battened timber framework in external walls to reduce cold-bridging, Double timber studwork walls in party walls for good sound insulation. Sprinkler system.

Environmentally friendly materials
Guidelines for residents on environmentally friendly internal finishes and products. Environmentally certified windows (Ecolabel). Seven products with environmental documentation approved by Norwegian Wood.

Universal design
23 of dwellings (approx. 20%) have whole life standard with level access (step down in foundation wall to meet external ground plane). Possibility to fit bedroom on first floor, and bathroom sized for wheelchair users. Individual colour scheme for exteriors ease of orientation. Environmental friendy materials specification and balanced ventilation provide good conditions for asthma and allergy sufferers.

It has been important to mix different housing units to create a diverse housing area. Cars are not allowed into the area, but are limited to the road at the circumference of the development. A public park with playground has been established in the interior of the development. This playground also serves children from surrounding neighborhoods. Public footpaths assure good accessibility. Outdoor areas as well as the public greenhouses are accessible for all users. Step-free levels assure accessibility.

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AREA AND VOLUME

Area: Type A: 137 sqm over three floors and basement (50 units). Type B: 157 sqm over two floors + basement (23 units).
Net internal area 10460 m²

ENERGY

Energy label: B
Energy consumption: Energy: net: 106 kwh/m2/year.
Energy consumption: delivered: 113 kwh/m2/year.
Energy consumption: weighted delivered: 86 kwh/m2/year.
Energy sources: Heating based on local district heating plant based on gas (fossil).
Estimated net energy: 108 kWh/m²/year (NS3031)
Estimated energy delivered: 113 kWh/m²/year (NS3031)

DYNAMIC ENERGY SIMULATION

ENERGY BUDGET

Room heating: 21 kWh/m²/year
Domestic hot water: 35 kWh/m²/year
Technical equipment: 35 kWh/m²/year

BUILDING TECHNICAL

U-value roof: 0,13 (W/m²K)
U-value floor: 0,15 (W/m²K)
U-value wall: 0,18 (W/m²K)
U-value windows/doors: 1 (W/m²K)
Heat recovery efficiency: 80 %

BUILDING COSTS

Price pr square meter: 11500 kr/m²
Extra expenses energy: 585 kr/m²
Project support Enova: 470000 kr
Project support Husbanken: 350000 kr

PROJECT DETAILS

Street address: Austtunsletta 10, 4020 Stavanger
Place: Hinna
Municipality: Stavanger
Project duration: 2005 - 2008
Status: Completed
Project type: New building / addition
Building type (function): Housing area / housing development , Detached home / townhouse
Environmental goal: Low energy house class 2
Case study project program: Norwegian Wood

PROJECT TEAM

Developer / client: Stavanger kommune v/ Stavanger Eiendom
Architect: April Arkitekter AS
Energy consultants: SINTEF Byggforsk
Consultants: Multiteknikk AS (RIV) | Ekrheim Elconsult AS (RIE) | Origo AS (VVA)
Main contractor: Tunge AS Mesterhus
Sub contractors: Rygg Maskin AS (grunn), Solland AS (ventilasjon), Team Rør AS (rør), Unison Elektro (elektro)
Drawings may contain errors and may not be in accordance with local law or building code. Drawings are copyrighted and for inspiration purposes only. National Association of Norwegian Architects is not responsible for any damage og loss caused by the any type of use of drawings available online.