Self-build home: Appoint a contractor to construct the home
Preparing tender documents.
Before appointing a contractor to construct the home, it is important to decide:
- The form of contract and contract conditions.
- Requirements for contractual warranties and performance bonds.
- Works that will not be part of the contract.
- The dates for commencing and completing the works and any phasing requirements.
The designer should co-ordinate the preparation of tender documentation, a pre-tender estimate (the final estimate of the likely cost of the works) and a cash flow projection (so that the requirement for funds is known).
The tender documentation provides a detailed description of the works that is issued to prospective contractors (tenderers) so they can prepare an offer (tender) for carrying out the works.
The tender documents might include:
- A letter of invitation to tender.
- The form of the tender submission that is required from prospective contractors. The more prescriptive this is about what is required, the easier it will be to compare tenders from different prospective contractors.
- Preliminaries. A description of the project that allows the contractor to assess costs which, whilst they do not form a part of any package of works, are required by the method and circumstances of the works, such as; contractors site huts, site hoardings, scaffolding, site plant and so on.
- The form of contract and contract conditions.
- The tender pricing document. Effectively this is an unpriced bill of quantities onto which contractors enter the prices, rates and totals that constitute their offer. Requiring contractor's to present their offer in this way makes it easier to compare submissions by different contractors. It can also help negotiations, by allowing easy identification of areas where one contractor may be proposing to charge significantly more than another.
- Design drawings.
- Specifications.
Selecting a contractor.
Potential contractors might be identified by:
- Advertising.
- Research.
- Recommendation.
- Existing relationships.
Interviews might then be carried out to produce a short list that appear suitably experienced, available and easy to work with.
The designer collates the tender documents and arranges dispatch to and return from the tenderers. It may be appropriate to arrange mid-tender interviews for the tenderers to answer questions, talk through alternative proposals, and to arrange site visits.
The designer co-ordinates assessment of the tenders received from contractors and may conduct further interviews. The designer prepares a tender appraisal report and negotiations are entered into with the preferred tenderer. A reserve tenderer may be selected in the event that negotiations are unsuccessful.
Before a decision is made to appoint the preferred tenderer, it is important to ensure adequate funding is in place.
The designer collates the contract documents and arranges for the execution of two copies, one for the self builder and one for the contractor. The contractor may be required to provide evidence of their insurance cover.
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. See CDM for self-builders and domestic clients for more information.
Featured articles and news
BSRIA Briefing 2024: Sustainable Futures speakers
Redefining Retrofit for Net Zero Living 22 Nov.
Wall of support for post-Grenfell regulation of electricians
Call for a shake-up of the construction industry highlighted on radio.
Digital sustainability through future AEC tools
Bringing together industry and academia to meet challenges.
Skills gap for net zero highlighted to Minister for Industry
ECA convenes roundtable discussion at Portcullis House.
Evidencing Net Zero with the new UK buildings standard
Pilot version with detailed excel proforma out now!
Scottish Building Safety Levy, in consultation
From direct remediation and the RPDT, to the costs and alternatives.
Waves of warmer homes grants for the rental sector
Boosting energy efficiency standards for all rented homes.
A refocus of the National Planning Policy Framework
Key terms described in brief, as the consultation closes the evening of the 24th.
Fortified farmhouses of the unruly 16th-and 17th-century borders.
ECA shares advice for those who may be exposed to risks.
How to revolutionise UK housing with MMC
CIC and Supply Chain Sustainability School unveil a plan.
From the UKs largest manufacturer and supplier of lime.
From mud bricks to smart concrete
A brief history from 7000BC to a future on the moon.
Regulator of Social Housing publishes latest fire safety report
Covering remediation of 11 metre plus social housing sector buildings.
Apartment and Duplex Defects Remediation Bill 2024
Approved for priority drafting by Government of Ireland.
The long list with in the frame of key historical events.
Competence frameworks for sustainability in the built environment
Code of practice, core criteria consultation draft for comment.
New Floods Resilience Taskforce
With a wet met office autumn prediction.