The Directorate for Building Quality (DiBK) is working on establishing a framework to analyse how rule changes in planning and construction affect construction costs. The Ministry of Local Government and Modernisation gave DiBK an assignment for 2019 in an award letter. The starting point for the order was the government declaration (the Jeløya platform), which states, amongst other things: The government would like houses, infrastructure, and commercial areas to be built quicker and cheaper. One of the measures that the government will carry out.

The cost effects of rule changes in planning and construction every fourth year.

This project consists of 2 parts:

— development of a calculation model for analysing the cost effects of rule changes,

— periodic calculations and maintenance of the model.

Development of a calculation model.

DiBK has assessed that the most appropriate calculation method is calculation from modelling buildings. I.e., an analysis of the cost effects of rule changes is made by modelling different types of buildings and the costs of constructing them before and after the rule changes.

Simple and representative model buildings must be modelled for the most relevant building categories. DiBK has used models for 3 different buildings for previous reviews, including energy rules.

— small houses,

— blocks of flats, and

— office buildings.

We would also like to use the same 3 building categories in this project.

DiBK has used building models that are a modification of SINTEF's building models for previous cost calculations of changes to energy rules. Furthermore, we have used a model that was developed for DiBK, DiBK-blokka. This is a further development of UU-blokka, which, amongst other things, is used to calculate the costs of changes in availability and universal design requirements. DiBK has specifications for these building models. Further development of DiBK-blokka is included in the project. DiBK has not developed its own models for small houses and office blocks other than the SINTEF models. These must therefore be developed in the project. It must be possible to put small house models together to form terraced houses.

The models for the 3 building categories must be built up in accordance with the specifications that apply in the current TEK requirements, so that they fulfil the rules, and so that, over time, it is possible to follow changes in construction costs resulting from rule changes. Furthermore, the models must be updated with any production requirements, such as working environment.

BIM models will not be developed in this project, but the models that are developed must be in IFC4 format so that they can be transferred to BIM for any later development of the model.

The models for building costs are a first step to assessing the total effects of rules connected to a building's lifecycle, for example, energy use in the building's lifetime.

In addition to developing building models, the tenderer must ensure that there is sufficient data that can be used as input values in the calculations. Tenders must include an account of how tenderers will obtain such data.

DiBK has established a reference group for the project, with representatives from relevant actors in the trade. Tenderers are asked to give an account of how they would make use of the above-mentioned reference group.

It is a prerequisite in the EU's building energy directive (Directive 2010/31/EU article 5) that a cost-optimum level is calculated for energy savings in buildings, in accordance with regulation 244/2012 and accompanying guidelines. Tenderers are requested to assess whether this regulation, or parts of it, are relevant for the development of the building models in this project.

The development of the model must be completed by 1.3.2020. Meetings will be arranged between the tenderer and the Contracting Authority as needed during the development of the model.

The model that is developed must be documented in a report that is to be made available for the Contracting Authority.

Periodic calculations and maintenance of the model.

Calculations of the cost effects of rule changes by using the developed model are to be made ad-hoc, based on the Contracting Authority's needs. There can be a need to set fixed intervals for the calculations if the Contracting Authority finds it appropriate. A cost calculations must be made in 2020, based on a selection of previous rule changes.

The calculation results must be documented in writing in reports that are suitable for publication to a broad target group of interested persons in the BAE industry, authorities and media. In addition the basic data for the calculations must be digitally available for the Contracting Authority.

The Contracting Authority will continually maintain the model and update the necessary data basis for the calculations.