Modified timber

In modified timber, the durability of the wood is improved by chemical or thermal treatment.

Regulatory framework

DIBt grants national technical approvals (abZ) for modified timber,

  • when it is not covered by the harmonised standards and
  • when it deviates significantly from the Technical Building Rules (cf. MVV TB, Chapter C 2) or
  • when neither Technical Building Rules nor generally recognised technical rules exist (e.g. innovative products).

European Technical Assessments (ETAs) can also be issued for products that are not (fully) covered by a harmonised standard.

For construction techniques comprising these construction products, DIBt grants general construction technique permits (aBG) when there is no conclusive technical rule for design and execution.

Application forms

National procedure

A national technical approval (abZ) and/or oder general construction technique permit (aBG) is granted upon application (see Model Building Code (MBO), Sections 16a(2) and18(2) and (4)). This also applies to amendments and supplements to, or renewals of existing approvals and/or construction technique permits.

No formal requirements apply. The following information is needed: name and address of the applicant, description of the product and/or construction technique and its field of use or application, type of decision required (new decision, amendment or supplement to, or renewal of, an existing decision).

Please feel free to use the template below.

Application for a national technical approval and/or construction technique permit (3 pages)

Version: January 2018; Application form

Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages)

Version: January 2018; Application form

Guideline: How to provide drawings for national technical approvals and general construction technique permits (5 pages)

Version: July 2017

European Technical Assessment (ETA)

To start the ETA procedure, please submit the form below. We will then check if the prerequisites for issuing an ETA are met, i.e., in particular, if the product is not fully covered by an existing harmonised standard. If the prerequisites are met, we will check whether a European Assessment Document (EAD) covering the requested assessment scope already exists or still needs to be developed. If an EAD needs to be developed or amended, a complete technical file needs to be established before the procedure can begin.

Form for requesting a European Technical Assessment (ETA) (2 pages)

Last updated: September 2021

  • abZ/aBG
  • Z = new decision | E = supplement | Ä = amendment | V = renewal | G = valid until
    Subject concerned Applicant Decision no. Validity
    from / to
    Kebony Clear Decking

    Kebony AS

    Hoffsveien 48

    0377 OSLO

    NORWEGEN

    Z-9.1-863 Z: 21.02.2017
    G: 21.02.2022
    "Accoya Schnittholz" als tragende Bauteile im Holzbau

    Accsys Group

    2-19 Lancaster Place

    WC2E 7EN

    LONDON

    GROSSBRITANNIEN

    Z-9.1-865 Z: 29.04.2020
    G: 21.02.2022

Anja Dewitt
Head of Section – Timber Construction

Phone +49 30 78730-317
Email adw(at)dibt(.)de

Legal reference documents

Testing, certification, inspection