A component is a constituent part of a building (or other built asset) which is manufactured as an independent unit, subsystem or subassembly, that can be joined or blended with other elements to form a more complex item. Generally, components are ‘self-contained’ and sourced from a single supplier, typically the complete unit provided by that supplier rather than its constituent parts.
A combination of components may be described as an ‘assembly’.
Where a component is a bespoke item, it may be necessary to prepare a component drawing. Where a component is an off-the-shelf-product or a commonly-used element, a component drawing may already exist that can be re-used.
Component drawings provide detailed information about the individual units. They may be drawn at large scales such as; 1:10, 1:5, 1:2, 1:1 and so on. They may include information such as component dimensions, construction, tolerances and so on. They may include references to the relevant parts of the specification providing information about materials and the minimum acceptable quality. It is important that component drawings do not duplicate information included in separate specifications as this can become contradictory and may cause confusion.
Component drawing numbers may be prefixed by the letter C.
Component range drawings describe a range of components of a similar type. Where a range of components comprise a number of standard constructions, sub-component drawings may be prepared.
Assembly drawings represent items that consist of more than one component, showing how the components fit together.
 Related articles on Designing Buildings Wiki
- As-built drawings and record drawings
- Assembly drawing.
- CAD layer.
- Concept drawing.
- Design drawings.
- Detail drawing.
- Engineering drawing.
- General arrangement drawing.
- Installation drawing.
- Scale drawing.
- Shop drawing.
- Section drawing.
- Technical drawing.
- Types of drawing.
- Working drawing.
Featured articles and news
Read about RSHP's British Museum extension which has been shortlisted for the 2017 Stirling Prize.
Read our introductory article to building a house extension.
More updates from DCMS about the large-scale testing of cladding systems and the number of buildings affected.
UandI secure resolution to grant planning consent for major new regeneration project.
IHBC article considers how heritage is dealt with when infrastructure schemes are authorised.
It was the tallest structure in the world for 3,800 years, but to this day the exact construction techniques are a mystery.
Shortlist for the industry's most coveted award announced.
Government responds to Mark Farmer's review of industry, rejecting the call for a levy on clients.
Peter Hansford to examine what wider lessons can be learned from the fire.
Every project is subject to uncertainty. How can construction better understand uncertainty for performance improvement?
MAD Architects reveal their designs for a futuristic campus for electric car manufacturer.
Homebuyers could borrow more with better forecasting of energy bills, according to industry consortium's new report.
Read our introductory article on carbon capture and storage.