Selecting the right builder is one of the highest-impact decisions in a property development. Get it right, and you have a partner who delivers on time and on budget. Get it wrong, and you face variations, delays, disputes, and margin erosion. This guide covers how to run a robust selection process that protects your project.
Why Builder Selection Matters More Than You Think
The builder relationship affects every aspect of the project from approval through to defect liability. A builder who understands development — as opposed to one-off residential builds — will manage costs more tightly, coordinate with your consultants more effectively, and understand the commercial pressures of a project that needs to settle on time. Choosing based solely on the lowest tender price is the most common and most expensive mistake developers make.
Preparing for Tender
Before approaching builders, ensure you have a complete set of documentation. This includes fully detailed architectural drawings and specifications, structural and civil engineering drawings, energy assessment reports, a geotechnical report for the site, landscape plans, and any specialist reports required by the approval conditions. The more complete and detailed your documentation, the more accurate and comparable the tender responses will be. Incomplete documentation is the primary cause of scope gaps and subsequent variations.
Running the Tender Process
Issue your tender documentation to three to five builders with relevant experience. Provide a consistent tender package to each, including a clear scope of works describing exactly what is included and excluded, the contract form you intend to use, a response template to ensure submissions are comparable, a tender programme with key dates, and site access arrangements for inspections. Allow builders adequate time to price the work — typically three to four weeks for a residential development. Rushed tenders produce inaccurate pricing.
Evaluating Tender Responses
When responses come in, resist the temptation to jump straight to the bottom line. Instead, check the scope of each tender against your documentation line by line. Look for items that have been excluded, qualified, or marked as provisional. Common exclusions that catch developers off guard include site preparation and demolition, temporary fencing and site facilities, utility connection charges, landscaping and external works, window furnishings, and any work described as by others. Create a comparison matrix that adjusts each tender to a like-for-like basis before comparing prices.
Conducting Builder Due Diligence
Price comparison is only part of the assessment. Before appointing a builder, verify their financial position through a credit check or financial reference, review their builder registration and insurance coverage, check references from previous developer clients specifically, inspect completed projects of similar type and scale, assess their current workload and capacity to take on your project, and understand their subcontractor relationships and trade availability. A builder who is financially stretched or overcommitted is a risk to your project regardless of their tender price.
Contract Negotiation
Once you have selected a preferred builder, negotiate the contract terms carefully. Key issues include the contract sum and whether it is fixed price or subject to adjustment, the practical completion date and delay provisions, the variation process and how additional costs are assessed, defect liability period and rectification obligations, retention amounts held as security for defect rectification, insurance requirements and responsibility allocation, and dispute resolution mechanisms. Engage a construction lawyer to review the contract. The cost of legal advice at this stage is negligible compared to the cost of a contract dispute during construction.
Checklist: Builder Selection
- Tender documentation is complete and detailed
- Three to five builders with relevant experience have been invited
- All builders received identical documentation and instructions
- Tender responses have been adjusted to a like-for-like basis
- Exclusions and qualifications have been identified and priced
- Financial due diligence completed on the preferred builder
- Builder registration and insurance verified as current
- References checked with previous developer clients
- Current workload assessed for capacity
- Contract reviewed by a construction lawyer
- Variation and dispute resolution processes clearly defined
- Defect liability and retention provisions agreed
Common Mistakes
The most frequent builder selection errors include choosing the lowest tender without adjusting for scope differences, issuing incomplete documentation and accepting the resulting variations, not conducting financial due diligence on the builder, skipping reference checks with previous developer clients, rushing the tender process to save time, not engaging a construction lawyer for contract review, accepting provisional sums without understanding the exposure, and failing to define the variation approval process before construction begins.
Frequently Asked Questions
Should I always go with the lowest tender?
No. The lowest tender often reflects excluded scope, understated provisional sums, or a builder who has underpriced to win work. A thorough like-for-like comparison is essential.
What is a provisional sum and why does it matter?
A provisional sum is an estimate for work where the full scope is not yet defined. It creates exposure for the developer because the actual cost may exceed the estimate. Minimise provisional sums by providing detailed documentation.
How many builders should I tender to?
Three to five is standard for residential development. Fewer than three limits competition. More than five dilutes the effort each builder puts into their response.
Is a fixed-price contract always better?
Fixed-price contracts provide greater cost certainty but may include a premium for the builder’s risk. They work best when the documentation is complete and the scope is well-defined.
What if I need to change the design during construction?
Design changes during construction are costly. They disrupt programming, require repricing, and often affect multiple trades. Resolve the design fully before construction begins wherever possible.
How do I manage the builder relationship during construction?
Regular site meetings, clear communication channels, prompt decision-making on variations, and timely progress payments build a productive relationship. Treat the builder as a partner, not an adversary.
Kaizen Projects has built strong relationships with quality builders across South Australia. Download the Builder Assessment Scorecard or contact us to discuss builder selection for your next project.
General information only, not financial, tax, or legal advice. Seek independent advice for your circumstances.