Last edited 15 Dec 2020

Self-build home: Appoint a range of contractors and suppliers to construct the home

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Where a self builder intends to co-ordinate the purchase of goods, materials and labour themselves, they may benefit from the services of a project manager or construction manager. This method of procurement carries with it the greatest risk in terms of keeping to budget and programme because responsibility is fragmented among many parties. The biggest challenge is sequencing the work in a way that minimises return visits and potential disruption. Problems of synchronisation can result in delays and claims for non-productive time.

Trade packages.

Production information should be divided into trade 'packages' to obtain prices from individual contractors and suppliers.

When deciding how to divide the works into separate trade packages, the interfaces between packages must be carefully considered and constantly monitored. Elements can fall between packages (for example the flashing to a rainwater outlet). Responsibility and consequent liability for each element of the works must be clearly defined.

It is normal to get quotes from more than one supplier or contractor for each package of work.

Contractors and suppliers might be identified by:

Discussing the works with suppliers and contractors during the design process, before appointing them, can help identify those that are most helpful and can also highlight potential problems. Contractors and suppliers might also be able to suggest alternative approaches based on their experience.

Discounts may be available from suppliers, particularly for large orders (this may make it worth buying a range of items from a single supplier), or by registering with organisations such as the self-build portal to benefit from group discounts. See Self-build homes negotiating discounts for more information.


When appointing contractors and purchasing goods and materials, it is important to be properly organised, with files for:

Other issues to address when obtaining quotations and placing orders include:

NB Self-build homes and the conversion of non-residential buildings into dwellings may qualify to reclaim VAT paid on eligible building materials and services. See VAT refunds on self-build homes for more information.

NB Self-build clients are ‘domestic clients’ for the purposes of the Construction (Design and Management) Regulations (health and safety regulations generally referred to as the 'CDM Regulations'), and so the client's duties under the regulations will generally fall to the contractor on a project where there is only one contractor or to the principal contractor on a project where there is more than one contractor. However self-build clients can attract health and safety duties under Part 4 of the Regulations if they control the way in which construction work is carried out. See CDM for self-builders and domestic clients for more information.

Next stage: Prepare for construction.

List of all stages.

Designing Buildings Anywhere

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