Plumbing contractors deal with a financial complexity that most bookkeepers aren’t equipped to handle: retainage that sits for months, jobs that bill on progress, certified payroll on public work, and bonding requirements that demand clean WIP schedules and percentage-of-completion reporting.
At Contractor’s Ledger, we work exclusively with trade contractors. Bookkeeping for plumbing contractors is something we do every single day — not as a sideline to retail accounting, but as our entire practice.
The Financial Challenges Plumbing Contractors Face
Retainage management. When a GC holds 10% on every pay app, that money sits in accounts receivable but isn’t truly receivable — it’s locked up until project completion. We track retainage separately so your receivable aging report reflects reality, not an inflated number that makes your cash position look better than it is.
Progress billing and percentage-of-completion. If you bill on a schedule of values, your revenue recognition needs to match work performed — not invoices sent. We set up percentage-of-completion accounting so your monthly P&L reflects where you actually are on each job.
WIP schedule preparation. Your bonding company and bank want to see a current WIP schedule that shows over-billed and under-billed positions on every open project. We prepare these regularly and format them to the standard surety underwriters expect. Learn more about WIP schedule preparation.
Job costing by phase and scope. Rough-in, top-out, trim, gas, and service are all different cost profiles. We build your chart of accounts to track costs at the phase level, so you can see where your margin is getting eaten before a project closes.
Certified payroll for prevailing wage work. Public projects, schools, government facilities — any of these trigger certified payroll requirements. We process certified payroll reports accurately and on time. See our contractor payroll services.
Subcontractor management. Many plumbing contractors use subs for specialty work — and managing 1099s, lien waivers, and subcontract costs correctly is more complex than most bookkeepers realize.
What We Deliver for Plumbing Contractors
- Monthly books closed and reconciled by the 5th
- Retainage tracked separately in accounts receivable
- Percentage-of-completion revenue recognition on open contracts
- Phase-level job costing matched to your estimating structure
- WIP schedules formatted for surety and bank review
- Certified payroll processing and prevailing wage compliance
- Subcontractor 1099 tracking and year-end filing
- Bonding-ready financial packages for bond line increases
Who We Work With
Our plumbing contractor clients range from 5-person residential plumbing shops to 50+ employee commercial mechanical subs handling large-scale construction projects. Many are in the $1M to $8M revenue range and ready to move up in bid size — which means their bonding capacity needs to keep pace with their ambitions.
If you’re bidding bigger jobs and your financials aren’t ready to support a higher bond line, that’s exactly what we fix.
Common Questions From Plumbing Contractors
What does retainage look like in my books? We set up a separate retainage receivable account so it doesn’t inflate your standard AR balance. You’ll see exactly how much retainage is outstanding and on which jobs.
How does percentage-of-completion accounting work? Instead of recognizing revenue when you invoice, you recognize it based on percentage of work complete. This gives you a more accurate picture of job profitability throughout the project, not just at the end.
Can you help me understand what my bonding company wants? Yes. We know what surety underwriters look for — current WIP schedules, working capital ratios, debt-to-equity, and a history of profitable job completions. We structure your financials to tell that story.
Ready to Clean Up Your Plumbing Books?
We’ll review your current setup, your retainage tracking, and what your financials look like to a bonding company — for free.
Get your free financial review →
Also serving: HVAC Contractors | Electrical Contractors | Mechanical Contractors | Fire Suppression Contractors