BOLIG+ er et ambitiøst initiativ med fokus på realisering af sunde, fleksible og energioptimerede boliger af høj arkitektonisk kvalitet.

På denne side kan du følge med i BOLIG+ processen og blive opdateret på projektets nyeste erfaringer.


BOLIG+ is about energy neutral housing units of high architectural standard with a significant reduction of CO2 emissions. 

BOLIG+ is defined by the following 5 rules:

  • ZEB building, energy neutral (yearly basis) including electricity for private equipment and lightning (minimum low energy class 1 which is 50% better than the demand in the DK building regulations 2008)

  • intelligent and user-friendly

  • flexible – in use and over time

  • good and healthy indoor climate

  • high architectural quality, adapted to the context

The BOLIG+ concept was initiated at The Danish Energy Camp 2005 and developed through 2006-2007

The BOLIG+ project is based in the BOLIG+ organisation with representatives from:

- The Danish Society of Engineers
- Architects` Association of Denmark
- The Danish Energy Saving Trust
- The Ecological Council
- Danish Building Research Institute
- Danish Technological Institute

In 2009 BOLIG+ carried through a competition on developing a BOLIG+ Housing scheme for 60 flats in Aalborg, together with A. Engaard A/S and Aalborg Municipality. The competition was won by TEAM+ and is about to be built in 2011-12. This project will be the first energy neutral demonstration multi storey project in Denmark. 



"How can Denmark be ahead in developing low energy homes for a growing World population?” This was the question formulated at an energy camp in Copenhagen 2006. 
The Residential BOLIG+ concept is afterwards developed in cooperation with many different parties in the building sector in Denmark. The process – defining the content and details – took place in 2006 to 2007. In 2009 an international project competition was carried out, thanks to grants from the Danish Energy Agency, the Realdania Foundation and the Danish Energy Saving Trust. 
The BOLIG+ is an attractive house - beautiful, functional and inspiring. The BOLIG+ is very energy effective and it is energy neutral (year to year) a ZEB, which means that it produces the same amount of energy as it consumes. 
The BOLIG+ rules are:

  • energy neutrality (yearly basis) including electricity for private equipment and lightning(Minimum low energy class 1 which is 50% better than the requirement in the DK Building Code 2006)

  • intelligent and user-friendly housing

  • flexible housing – in use and over time

  • good and healthy indoor climate

  • housing of high architectural quality, adapted to the context

Rule 1: Energy neutrality 
Annually, an energy neutral building does not use more energy from the outside than it returns. The returned energy has to be of the same or of a higher quality than the energy that is used (e.g. electricity supplied to the grid as compensation for purchased heat) and it should also have at least the same applicability (the building can e.g. not receive heat during winter and return it during summer).

Electricity produced using smaller PV-systems (< 6kW) can be delivered to the electricity network in Denmark, at the same price as the received electricity. If the “exported” production exceeds the “imported” electricity the difference has unfortunately no value. For larger PV-systems/plants a special agreement will be developed between the PV-owner and the energy company. 

The BOLIG+ is an attractive house - beautiful, functional and inspiring. The BOLIG+ is very energy effective and it is energy neutral (year to year) a ZEB, which means that it produces the same amount of energy as it consumes. 
Energy neutrality can be ensured through the design of the building, constructions and installations, including the utilisation of solar energy. The requirement for energy neutrality includes that each building must fulfil the energy framework for low energy buildings, class 1, calculated with the calculation program Be06, however not including possible electricity production in connection with the building, e.g. from solar cells. 
Energy neutrality can apply to:
Buildings without common local energy system:
The individual building observes the definition of energy neutrality. The individual buildings observe the upper limits for low energy class 1 buildings. 
Buildings with common local energy system:
The building inclusive common energy system observes the definition of energy neutrality. The individual buildings observe the upper limit for Danish low energy class 1 buildings. 
Energy neutrality is documented via Be06 and the BOLIG+ toolkit by assembling of an energy balance month pro month in a normal year: 

  • The monthly energy consumption divided on space heating, DHW and electricity.

  • Energy received from the outside: from the local grid (electricity, district heating or gas) or as oil or biomass (e.g. wood, bio fuels or biomass pellets).

  • Energy that is returned to the local grid.










Rule 2: Intelligent and user friendly A BOLIG+ dwelling is equipped with systems that via control, measurements and demand control contribute to energy neutrality but also to increasing the utility value of the dwelling. For instance – electric light only has to be on when natural daylight is insufficient and also only when users are present. The same conditions go for a number of other “energy services” – electricity consuming equipment, e.g. PCs, TVs, radios etc. 

In addition, a number of services interact – e.g. by switching off/limiting unnecessary artificial light combined with optimum use of solar shading it is possible to reduce the need for ventilation and at the same time obtain an improved indoor climate by avoiding excess heating. Optimized, intelligent use of the services can give reduced energy consumption and an improved indoor climate. 

Simple and continuous feedback about the energy consumption and energy production to the users of the individual dwellings combined with control via a pedagogical user interface can contribute to: improved user patterns, a more appropriate control of heat and ventilation system and improved use of flexible components in the thermal envelope. 
When the conditions concerning energy tariffs and control of electricity consumption in the long run are provided, the systems can be equipped with an “Energy trader” that to a possible degree controls the electricity consumption and sale according to varying electricity prices. The “Energy trader” can give a possible financial advantage and also be an asset in connection with the visualisation of the energy users. The system can form part of the intelligent control of a dwelling but in principle it is not necessary in order to obtain energy neutrality as it does not by itself lead to reduced energy consumption. 
Well-documented combinations of known solutions are important. As far as possible the systems have to utilize open standards (plug and play suited) with expansion possibilities and wireless communication.










Rule 3: Flexible – in use and over time This includes flexibility for use, flexibility for renovation and flexibility for adapting to different climatic conditions during the year. The BOLIG+ has to be the physical frame related to the opportunities for various family structures - the traditional family etc. Flexibility means that the house can be adjusted to new conditions, e.g. the number of occupants, young families, families with grown up children, old and not so mobile people etc. 

The flexible climatic shield can be replaced currently due to wear and tear and due to the fact that new technology gives new opportunities for more energy-optimized solutions. All components with a lifetime shorter than the building itself is replaceable in a simple way in a BOLIG+. The basic constructions in a BOLIG+ have a long lifetime and are made in sturdy materials. 

The climatic shield in a BOLIG+ is dynamical and varies during the year. The design of a flexible climatic shield is very close connected to the decisions regarding energy consumption, utilization of the house and habits of the occupants. 
The agents can be dynamic facades, windows with shutters, sun shadings, double-facades, flexible utilization of the rooms, replicable components of the building, flexibility in utilization of the installations (electricity, heating, water supply etc.). 















Rule 4: Good and healthy indoor climate This includes: Indoor air quality, daylight quality, thermal conditions and noise. 

Building materials must not liberate gasses, solid polluting particles or ionizing radiation, which can result in unsatisfactory and unhealthy indoor climate conditions. Indoor air humidity has to be kept at a reasonable level. The daylight conditions in a HOUSE+ have to assure good and sufficient daylight in a big part of the daytime. Draught etc. must not occur and uncomfortable temperatures must be avoided. Noise nuisance from outside and internal noise is minimized in a HOUSE+. 













Rule 5: High architectural quality, adapted to the context A BOLIG+ is adjusted to the local conditions, e.g. public and private energy supply and local drain off etc., sun and wind conditions, noise influence, air quality, surroundings and scenery. A BOLIG+ is of high architectural quality. A BOLIG+ building is situated, designed and shaped so that the local microclimatic conditions around the house are optimized. The daily experiences both inside and outside the house are very important. 

Documentation of energy neutrality The documentation of the buildings’ and installations’ performance (including renewable energy) is provided through input data and calculation results using the official and latest version of the Danish calculation tool Be06, with some raised standards:

Be06 standard raised into Bolig+ standard

  • Temperature 20 > 22 °C

  • Intern heat load 3.5 > 1.72 W/m²

  • HDW 250 > 375 l/m²

  • Private electricity 0 > 1700 kWh/dwelling.

The documentation of fulfilling the overall demanded energy neutrality is provided using the BOLIG+ toolkit. Be06 is the official Danish tool for proving that a new building meets the requirements in the Building code (BR) regarding energy performance. Compliance with the demands in the BR is a necessity to obtain a building permit. Be06 also calculates compliance with the two low energy classes defined in BR. 
The BOLIG+ toolkit is an Excel-tool, developed by the Danish Building Research Institute and the Danish Technological Institute, and used for verification and calculation of energy neutrality for a building, month by month and on a yearly basis. 
Collaboration with the municipality and the developer
A central idea of this project was to force a maximum climate and environmental responsible development of the Danish building tradition, by actually having a ZEB house build under normal market conditions. The BOLIG+ organisation collaborated with the Aalborg municipality who wanted to sell the building site to be a place for housing of a specific architectural quality. We made it a clear selling condition, that a BOLIG+ housing project should be realised by the future owner of the building site. 

The plot was bought under these conditions by a local developer A.Engaard A/S, who afterwards participated in formulating a competition program for dwellings, he would like to build and sell and dwellings fulfilling the 5 BOLIG+ rules. The building site is harbour front – south orientated and standard within a reasonable economy set by the in the Centre of the town of Aalborg. 
A huge interest resulted in some 44 applicants for the prequalification of competing teams of engineers and architects. Five teams of engineers and architects were prequalified. 
During the prequalification process we had conferences and seminars on the subject of architectural challenges, and on the definition of the BOLIG+ standard. The mantra was: This has to be real integrated design among architects and engineers if you will realise the BOLIG+. 
Competition process 
The competition program defined quite a job for the architects and engineers – detailed calculations were demanded, as we know fatal decisions can be taken in the first sketches if you stick only to your intuition. During the competition period, teams were allowed to have each 2 free workshops with experts from the Danish Building Research Institute and from the Danish Technological Institute. 














Team: Rambøll Denmark, Transform Architects, COBE Architects, Transsolar Stuttgart, PROTEC, Danfoss and Rockwool 















Team: Arkitema Architects, Leif Hansen Engineers & Thornton Thomassetti Engineers, Esbensen Engineers, Faktor 3, DONG Energy, Boligforeningen Ringgården and Bau-How Danmark 















Team: C. F. Møller Architects, Moe & Brødsgaard Engineers, Vogt Landschaftsarchitekten, Erik Juul, Cenergia, Schüco and Philips 














Team: Lundgaard & Tranberg, Dominia and Danfoss Heating Pumpss














Team: Vandkunsten Architects, Wissenberg Engineers, Brian Edwards from Architecture School / Royal Academy of Fine Arts, Rockwool International and Danfoss 

The evaluations of the entries were conscious – a jury with specialists: engineers, architects and the developer supported by the Danish Building Research Institute and the Danish Technological Institute were evaluating the entries. 

Documentation of the energy performance of the competition projects was provided through input data and calculation results using the official Danish Building Code calculation tool Be06, while the documentation of fulfilling the overall demanded energy neutrality was provided using the BOLIG+ Toolkit, an Excel-tool, developed by the Danish Building Research Institute and the Technological Institute for this project. 

The results of the BOLIG+ project competition in 2009 winner was published September 28th 2009 in Aalborg:
TEAM+, consisting of Arkitema Architects, Esbensen Engineers, Orbicon/Leif Hansen engineers and Factor 4 is the team to build their project. 

The winning project



















The 6 to 10 storey high dwelling building is formed to enjoy natural daylight, the view and outdoor balconies. A building with a view of the fjord and the town of Aalborg, while orientated towards the sun to harvest the maximum solar energy on the east to west facades, while the north-west facade is different, protecting the dwellings against a rather harsh wind. 


  • A prefabricated wood construction

  • 62 dwellings

  • 7000 m²

  • 10 and 6 floors

  • Energy need: 13 kWh/m² per year

  • 200 m² PV/solar heating on the roof

  • 600 m² PV on the roof

  • 900 m² PV on the facade

  • Heat pump on air inlet and solar heating for floor heating and HDW

  • Mechanical ventilation with recovery

  • PV

  • Pumps

  • Ventilation

  • HDW

  • Room heating

  • Private appliances and lightning


  • PV
  • Pumps
  • Ventilation
  • HDW
  • Room heating
  • Private appliances and lightning



This demonstrates the design dilemma: How to cope with possibilities for integrating PV’s on the building compared with the basic energy needs for a low energy class 1 building? The winning project went through a process of optimising on all possible parameters – to find a balance that ensured energy neutrality on a yearly basis. 










 Conclusions by BOLIG+

The overall conclusion of the competition process so far is a “yes we can design a ZEB building of good quality within normal cost.” 2 of the 5 entries, no 2 and no 3, did reach the target of energy neutrality on a yearly basis. 

  • Electricity needs for installations
  • HDW
  • Room heating
  • Electricity for household 

Furthermore it’s clear that building the expected 2020 energy frame “near zero energy” is easy done already now. The winning project and project no 3 do have an energy need for running the house of only 13 and 18 kWh/m2/y. The conclusion is: we can build 2020 standard without very high extra costs. 
Another conclusion is: A real profound integrated design process is not yet everyday practice in the building sector. It was obvious that some of the competing teams to some extend failed on this, and it was clear that the winning team had made huge progress on developing a new working method. Architects and engineers so to say working hand in hand from the very first sketches and all through the process with focus on the five rules, and with both a parallel running energy performance and economic calculation to ensure the project could be build within the economic frame and still energy neutral. 
Ongoing process on realising the winner project in Aalborg harbour residential area. In the final detailing together with the contractor, is now also investigated the possibilities of a BOLIG+ construction with precast concrete elements, in order to compare costs, aesthetics and performance. During final detailing process further workshops with specialist, from the Danish Building Research Institute and the Danish Technological Institute, will be made. 
The building process as well as the evaluation conducted by the Danish Building Research Institute / Aalborg University, will be widely disseminated for maximum impact, e.g. the project is a part of the IEA Task 40.