How To Prepare As Built Drawings

As-built drawings and tape drawings

On building projects information technology is mutual for changes to be made during structure because of circumstances that sally on site. These changes can exist relatively pocket-sized or can exist very significant.

As a outcome, it is common for the client to require that as-built drawings are prepared, either during the construction process or when structure is complete, to reflect what has actually been built. The contractor volition generally mark up changes to the 'last structure event' drawings on-site using blood-red ink, and these can then be used by the consultant team to create tape drawings showing the completed project. This information may be supplemented by as-congenital surveys.

These record drawings (sometimes referred to every bit 'as synthetic' drawings) may exist required for the Health and Safety File or the functioning and maintenance manual issued to the client on completion of structure.

Apart from registering on site changes to the engineers' and builder'south drawings it is essential that specialist trade contractors record what has been installed on site. Records of installations such as nether-floor cabling in city offices is a particular trouble considering successive tenants cut off, simply leave in, their predecessors cables then instal their own systems. Without cabling records this can prove very problematic for subsequent companies that occupy the bounds.

The client'south facilities direction team must keep tape drawings up to date, incorporating details of hereafter modification to the edifice. If they exercise not do this, ultimately, surveys may become necessary to re-create authentic measured drawings.

The requirement to produce every bit-built drawings and record drawings must be set out in tender documentation, and should not be assumed to be part of 'standard' services. Information technology can be a fourth dimension-consuming exercise, and equally the projection team will be great to move on to other jobs, it is important that adequate retentiveness remains to ensure completion of as-built and tape drawings.

If a edifice information model has been produced, this must be updated to reverberate any changes to the design, then issued to the client in a grade that the facilities management team tin continue to develop.

NB The RIBA Plan of Piece of work 2013 defines 'as constructed' information as: Data produced at the finish of a projection to represent what has been synthetic. This volition comprise a mixture of 'equally-built' information from specialist subcontractors and the 'final structure outcome' from design team members. Clients may too wish to undertake 'equally-built' surveys using new surveying technologies to bring a farther degree of accuracy to this data.'

Blueprint Framework for Building Services 5th Edition (BG 6/2018), written by David Churcher, John Sands & Martin Ronceray, and published past BSRIA in June 2018 suggests that record drawings (in relation to buildings services) are:

Drawings showing the building and services installations as installed at the engagement of practical completion. The primary features of the record drawings should be as follows:

The drawings should be to a scale not less than that of the installation drawings.
The drawings should testify locations of all the mechanical, electrical and public health systems and components installed including ducts, pipes, cables, busbars, plant items, pumps, fans, valves, dampers, command devices, strainers, terminals, electrical switchgear and components, security and fire sensors and control equipment.
The drawings should be labelled with appropriate pipage, duct and cable sizes, pressures and menstruum rates.
The drawings should have marked on them positions of admission points for operating and maintenance purposes.
The drawings should not be dimensioned unless the inclusion of a dimension is considered necessary for location.