Self-build home: Prepare production information
In this stage, we attribute design activities to ‘designers’. These may be architects and engineers, a design and build contractor, or a kit house supplier. If a kit house supplier is only supplying the house itself, additional design consultants may be required.
Production information may include:
- Drawings (location drawings, component drawings and dimensioned diagrams).
- Specifications, calculations and design criteria. Specifications provide descriptions of the materials and workmanship required. Design criteria might include; environmental conditions, acoustic requirements, critical dimensions, accessibility requirements, loadings and so on.
- Bills of quantities or schedules of work. Bills of quantities are measured quantities of the work identified on the drawings and specifications that can be used to cost the works. Schedules of work are 'without quantities' instructional specifications often produced on smaller projects, or for items such as builders work or fixing schedules.
- Bespoke cladding systems.
- Service diversions.
- Underground drainage.
- Piling and groundworks.
Preliminary contracts might be considered for some of these works to allow them to begin early. Long-lead items such as piling rigs might also be ordered in advance of other works.
Many elements of production information will be produced by suppliers or contractors. The designer should check drawings and specifications provided by suppliers and contractors to ensure they are properly co-ordinated.
Increasingly, software is used to prepare elements of production information, such as; computer aided design (CAD) to prepare drawings, and proprietary systems for the preparation of specifications. The recent emergence of building information modelling (BIM) can allow the automatic generation of production information from a single co-ordinated model, which should result in a reduction in errors and so costs.
NB During this stage, the lead designer should also co-ordinate any outstanding information needed for remaining building regulations or other statutory approvals which must be submitted before works start on site. It is also important to ensure that any necessary party wall notices have been served.
► Next stage:
- Appoint a contractor to construct the home, or;
- Appoint a range of contractors and suppliers to construct the home, or;
- Confirm appointment of the design and build contractor to construct the home, or;
- Confirm appointment of the supplier to fabricate and install the kit house.
Featured articles and news
There were over 1,400 new articles added to Designing Buildings Wiki in 2016. Here are the top 15 most popular.
MVRDV reveal designs for a strange holiday villa in Taiwan.
New milestone achieved with launch of new safety lanyard for working from height.
A quick introductory article about preliminaries in construction.
Brandenburg Gate - an historic structure that went from symbolising German partition to European unity.
A discussion between construction key players and leading insurers on the future outlook for construction insurance.
New guide from BSRIA on building performance evaluation in domestic buildings.
Rogers Stirk Harbour and Partners complete new trio of towers at Sydney Harbour.
With a new government consultation underway, ICE look at creating a smarter, more flexible energy system.
British Antarctic Survey announces research station is to relocate 23km due to growing crack in the ice shelf.
A great example of mimetic architecture with the Fish Building of India.