Self-build home: Appoint a range of contractors and suppliers to construct the home
Introduction.
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.
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:
- Advertising.
- Research.
- Recommendation.
- Existing relationships.
- During the design process.
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:
- Requests for quotations.
- Submitted proposals and prices.
- Orders.
- Confirmation of orders, prices and delivery.
- Delivery receipts.
- Invoices (separating the VAT element on the direct purchase of materials).
- Accompanying product literature such as; assembly instructions, operating manuals, spares and consumables information, maintenance and repair depots.
- A ledger recording all payments and financial commitments.
- Receipts of payment.
Other issues to address when obtaining quotations and placing orders include:
- Allowing for cutting and wastage.
- Purchasing spares and consumables to take full advantage of purchasing power.
- Obtaining warranties wherever possible.
- Obtaining servicing and maintenance quotes at the same time to take advantage of competitive leverage. This might include; boiler plant, heat exchangers, security systems, sewage treatment systems, automatic gate systems, garden maintenance and so on.
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.
Featured articles and news
Introducing or next Guest Editor Arun Baybars
Practising architect and design panel review member.
Quick summary by size, shape, test, material, use or bonding.
Types of rapidly renewable content
From forestry to agricultural crops and their by-products.
Terraced houses and the public realm
The discernible difference between the public realm of detached housing and of terraced housing.
Put digitalisation and sustainability at the core of curricula
Project management educators are urged.
Looking back at the influence of climate events
From a designer and writer: 'There are limits to growth but no limits to development'.
Terms, histories, theories and practice.
Biophilic design and natural light
Letting in the light and natural elements into spaces.
APM Programme Management Conference 2024
Strategies for Success.
Residential takes the reins as contract awards even out
Contracts down, but remain above the last quarter of 2023.
Celebrating Eid and the largest mud-brick building.
Barry Kingscote claims prestigious CIOB CMYA Award.
The British Mosque: an architectural and social history
The story of some 1,500 mosques or more in Britain.
Heat pump refrigerants, efficiencies and impacts
R12 to R1270 what are the differences?
Global heat pump market in 2023
Challenging times with positive but modest outlook.
Beyond the infrastructure pipeline
Opportunities and chokepoints.