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Code of Practice 'Measures Necessary where Apparatus is affected by Major Works' (Diversionary Works)


The aim of this Code of Practice (CoP) is to provide guidance on the costs of diversionary works and to minimise the extent of such works to everyone who would be affected. It also sets out who is responsible for each aspect of such works and explains what needs to be done before, during and after works.

The cost are to be split between everyone concerned with the authority paying 82% of cost and undertakers 18%.

The CoP applies to undertakers apparatus within a maintainable highway or road, such as ducts, pipes, cables and any other such apparatus.

Where does the CoP apply?
The CoP applies to works in the following categories:

  • reconstruction of any road, including widening or being made redundant.
  • installation of a dual carriageway road or roundabout.
  • where the surface level of the road is to be changed.
  • where a carriageway, footway or cycleway is being provided, altered, widened or re-levelled.
  • where a road hump is installed or removed.
  • if a vehicle crossing over a footway or verge is to be constructed.
  • installation of cattle grids.
  • tunnelling or boring under the highway.
  • any bridge which crosses the highway that belongs to the authority or transport authority is to be replaced, altered, reconstructed or removed.

What need to be done?
The road and highway authorities produce annual planning reports and plans which show where planned works are going to take place. A copy of these reports are sent to each undertaker within the region of the planned works. Undertakers also need to provide the road or highway authority with their own planned major works programmes. This would in principle ensure that works are coordinated by consultation and agreement prior to the works commencing.

Authorities will be required to issue a notice of intended works to undertakers and enter the details on their streetworks register, undertakers are required to acknowledge receipt of this notice.

An undertaker is required to give notice of intended major works, the authority can counter this notice by proving that they intend to carry out their own works within 5 years and issue their own notice to this effect. If the undertaker carries out works within this period then they are to pay for all necessary diversionary works and the care and protection of already installed apparatus.


Bridge Works and Replacement Schemes
Any works which include strengthening, waterproofing, widening, reconstruction or widening of the bridge that will affect apparatus will require early consultation to identify solutions and agree works to be carried out.

Redundant Roads and Highways
Redundant road, highways, verges, footways, etc are those that the authority or the Secretary of State are to close or are no longer required. The maintenance of these would normally revert to persons who's property fronts the areas.

The authority is required to discuss such closures with undertakers  and undertakers inform the authority of its needs in relation to apparatus. New owners will need to be informed of any wayleave or easement. Undertakers should also consider the installation of any ducts to facilitate any future diversionary works. Where new owners are to develop the areas they must consult with the undertaker prior to any development work being carried out.

Should the redundant road still be maintainable by the authority the right of the undertaker remain unaffected.

Redundant Bridges
Where a bridge is to be demolished the authority must inform undertakers within 10 years of expected works. The undertaker must respond to this notice by stating the apparatus that would be effected by such works. An undertaker who goes ahead and places apparatus after notice is given will be responsible for all cost of diversionary works when demolition is carried out within 10 years.

If the redundant bridge is to remain maintainable by the authority then the rights of the undertaker are protected.

Replacement Carriageway Construction
Where the authority is to replace a for example a flexible carriageway with a rigid construction or any expensive paving surface, etc, the undertaker will meet the full cost of diversionary works where such works are not required by the authority.

Modified or Replacement Bridges
Where apparatus already exists the new bridge design will allow for the placement of the  apparatus. The authority is to pay 82% of the cost and the undertaker 18% for the works to be done. This would include hangers, ducts, pipes, etc and any diversionary works. Any additional apparatus that the undertaker wishes to install may be done at the time but full cost will be met by the undertaker.

Changes in Depth
Provided that the apparatus is at a reasonable depth before works starts the cost will be split 82/18. Where the apparatus is not at a reasonable depth to allow for protection the authority should consult the undertaker to making a greater contribution to cost. This additional cost need not be made where the undertaker accepts the reduced depth as a result of the works.

Private Development Funded Works
Where an authority is entitled to a contribution from a private developer towards the cost of diversionary works the undertaker will only meet the 18% of cost that are not covered by the contribution.

The developer will normally pay for the undertakers works prior to works commencing to ensure that the works are protected from any further diversionary work or as a result of undertakers changing their plans.

The authority can recover cost from third parties on behalf of the undertaker for any diversionary works.

Any resurfacing or replacement or replacement of special surfacing should normally be done by the highway authority. Undertakers highway ironwork where worn or damaged will be supplies without charge when being replaced. The undertaker may refit ironwork. This type of work would not be treated as diversionary works.

Redundancy of Roads and Bridges
Where undertakers carry out diversionary works within a redundant highway that has been declared by the authority, the undertaker is to pay the full cost of such works. This applies where the road has been made redundant within 5 years of declaration or ten years for a bridge. If redundancy has not occurred then the 82/18 cost applies.  

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