Not all main contractors are created equal. The difference between a good contractor and a bad one can mean the difference between a profitable project and a cash flow disaster. But how do you tell them apart before you've committed?
Here are the four things that matter most when evaluating a main contractor, and how to assess each one.
1. Payment Reliability
This is the number one factor for most subcontractors, and for good reason. You can handle a difficult site or a demanding programme, but you can't run a business if you're not getting paid.
What to look for:
- Payment terms of 30 days, and certainly no more than 60. The Commercial Payments Bill would make 60 days the legal maximum in most business contracts, but on 14 October 2026 it was still before Parliament and not law.
- Clean payment history. Check the government's Check Payment Practices service for large contractors.
- A good word on payment from other subcontractors who have worked for them
- No history of County Court Judgments. Adjudication decisions are private, so you'll usually only hear about those through your network.
- Fair retention terms (5% max, released on time)
A contractor who pays well attracts the best subcontractors, which means better quality work, which means fewer defects and disputes. It's a virtuous circle that starts with payment reliability.
2. Communication
Good communication prevents problems. Bad communication creates them. A well-run contractor will have:
- Clear tender documents. The scope should be unambiguous. If you can't understand what's included, how can you price it accurately?
- Responsive project teams. Queries answered within 24 to 48 hours, not left hanging for weeks.
- Regular site meetings. With agendas, minutes, and follow-up on actions.
- Early warning of changes. Not springing variations on you after the work is done.
- Accessible QS and commercial team. The people processing your payments should be reachable and helpful.
3. Site Management
A well-managed site makes everyone's job easier. Poor site management costs subcontractors time and money through:
- Waiting for access to work areas
- Clashes with other trades due to poor coordination
- Missing or late information (drawings, specifications)
- Inadequate welfare facilities
- Unrealistic sequencing that creates bottlenecks
Before committing, ask to visit one of the contractor's current sites. You can learn a lot from 30 minutes on a live project. Is it clean and organised? Are the operatives wearing PPE? Is the site board up to date? These details reflect the contractor's standards.
4. Health & Safety
Safety should never be compromised, but some contractors take it more seriously than others. The best contractors:
- Invest in proper inductions, not just a tick-box exercise
- Provide adequate welfare facilities (clean toilets, drying rooms, canteen)
- Have visible safety leadership, with managers on site and engaged with the workforce
- Report near-misses honestly rather than hiding them
- Don't pressure trades to cut corners to meet programme
The HSE does not publish RIDDOR reports by company. What it does publish are registers of improvement and prohibition notices, which stay up for 5 years, and convictions, which stay up for 10 years for organisations. They're worth a search, but they only tell part of the story. The culture on site matters more than the records.
How to Research Contractors
Before committing to a project, spend an hour doing your due diligence:
- Check the company on Construction Rating. Each company page shows financial signals from public records: Companies House status and filings, Gazette insolvency notices, payment practices figures and Fair Payment Code awards. Here's how they work.
- Check Companies House. Look at their accounts, filing history, and director information.
- Check Payment Practices. For larger contractors, the government's service shows their reported payment statistics.
- Search the HSE registers. Look for recent enforcement notices and convictions.
- Ask your network. Talk to other subcontractors who've worked with them. The construction industry is smaller than you think.
- Visit a current site. If the contractor is serious about winning your services, they'll arrange a site visit.
The Bottom Line
The best main contractors to work for share the same qualities: they pay on time, communicate clearly, run organised sites, and take safety seriously. These aren't luxuries. They're the baseline for a professional working relationship.
Don't settle for less. There are good contractors out there who value their supply chain, and the more subcontractors who choose to work with them over the cowboys, the faster the industry improves for everyone.
Construction Rating lets subcontractors review the main contractors they work for. If you've worked for one, add your experience.