Development proposals may include specialist components that are best designed in detail by their manufacturers or installers. Such items could include; lifts, escalators, cladding systems, switchgear, refrigeration units, heating ventilation and air conditioning (HVAC) systems, cleaning cradles and so on.
In such cases it is often desirable to secure this specialist design before the supply contract has been tendered in order that they can be properly integrated into the overall design and so that delays do not occur and variations are not necessary.
- Writing a closed specification for specific components that could only be satisfied by the specialist contractors.
- A two-stage tender process where the specialist contractors design services are procured in the first stage along with agreed rates, overheads and profit for the products or services to be supplied in the second stage. The specialist contractor might then become a named sub-contractor or nominated sub-contractor, or a named supplier in the main contract. In some cases, the second stage appointment might be made direct by the client (for example for the supply of equipment outside of the scope of the main contract).
 Related articles on Designing Buildings Wiki
- Building information modelling.
- Collaborative practices.
- Main contractor.
- Nominated sub-contractor.
- Named sub-contractor.
- Named supplier.
- Procurement routes
- Specialist designer.
- Specialist contractors' start-up meeting.
- Specialist subcontractor.
- Tender process.
- Two-stage tender.
- Types of contractor.
- Working with landscape maintenance contractors.
Diversity, social value and skills
 Join in
Building People is bringing together the huge amount of resource that exists across the Built Environment industry, with a focus on diversity and inclusion, skills and careers, and social value.
We need your help to do this.
Have you got useful material to share? Do you know of information that would be helpful to others? If it is relevant to the Built Environment and to diversity, skills and social value, then it's relevant to others. Help them find it by using the guidelines below.
 Add your own content
- For guidance about writing and adding your own content see Get started - top tips and help.
- Some articles are more popular and useful than others. This article explains more.
- Make sure you use the right title as this helps search engines find it. See here for guidance.
- Add your signature to link readers to your profile.
- Tick the 'People' box when you submit the article - that way your content will appear in this Building People microsite.
- Finding it tricky? Contact us for assistance.