Independent network engineers and small network consulting firms design, install, and support the wired, wireless, and WAN infrastructure that small and mid-size businesses rely on. Invoices typically cover site surveys, switch and firewall configuration, Wi-Fi deployments, VPN setup, troubleshooting, and ongoing managed support. Work is billed by the hour, by the project, or as a monthly retainer, often with hardware resold at a markup.
Create an invoice for payment collection
Upload logo
PDF will be generated with filename:
Invoice_1001_Client_2026-10-14.pdf
Most independent network engineers bill hourly for troubleshooting, small changes, and support, and use fixed project fees for defined work such as an office network build, a firewall replacement, or a Wi-Fi redesign. Fixed fees are usually built from estimated hours plus a contingency, with a clear scope and a change-order rate for anything extra. Emergency and after-hours work commonly carries a 1.5x to 2x multiplier, and many engineers set a minimum charge of one or two hours for on-site visits. Ongoing monitoring and support is often sold as a monthly retainer, either a block of prepaid hours or a flat per-site or per-device fee. Hardware, licenses, and cabling are billed separately, typically at cost plus 10 to 25 percent, and subscription items like firewall security licenses are often passed through at renewal. Travel time and mileage are billed when the client is outside your normal service area.
| Service | Priced | Typical range |
|---|---|---|
| Remote troubleshooting and support | per hour | $90-175 |
| On-site network engineering | per hour | $120-200 |
| Emergency / after-hours support | per hour | $180-300 |
| Wireless site survey and Wi-Fi design | flat fee | $800-3,500 |
| Small office network build (firewall, switch, APs) | flat fee | $2,500-9,000 |
| Firewall / VPN configuration | flat fee | $600-2,500 |
| Network documentation and diagramming | per hour | $90-150 |
| Managed network monitoring and support | per month | $250-1,500 |
Typical US ranges. Rates vary by region, experience, and job size.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Network assessment and Wi-Fi coverage survey, 4,500 sq ft office | 1 flat fee | $1,200.00 | $1,200.00 |
| Firewall replacement and configuration (VLANs, site-to-site VPN, content filtering) | 6 hours | $150.00 | $900.00 |
| 48-port PoE managed switch installation and configuration | 3 hours | $150.00 | $450.00 |
| Wireless access point mounting and configuration (4 units) | 4 each | $125.00 | $500.00 |
| Network documentation and IP address plan | 2 hours | $110.00 | $220.00 |
| Hardware: firewall, switch, 4 access points (equipment cost plus 15%) | 1 lot | $3,450.00 | $3,450.00 |
| Total | $6,720.00 | ||
Notes: Payment due within 15 days of invoice date. Hardware remains subject to manufacturer warranty; license renewals are billed separately at renewal. Support after cutover is billed at the standard hourly rate. Late balances accrue 1.5% per month.
Clients often review time entries against a ticket or change window, and clear dates prevent disputes over what was done and when.
Serials let the client register warranties, process RMAs, and track assets, and they prove what was delivered.
Firewall security bundles, wireless controller licenses, and support contracts expire, and the client needs to know what they bought and when it renews.
Tying each line to an agreed scope or PO number makes approval easier, especially for clients with accounts payable departments.
Travel is often billed at a different rate, and listing it on its own avoids questions about the hourly total.
If you charged 1.5x or 2x for a maintenance window or outage call, stating it explicitly shows the rate was agreed to and not an add-on.
For managed clients, showing hours used, hours remaining, and any overage keeps the monthly billing transparent.
Net 15 or net 30 is standard for business clients, with net 15 common for small projects and time-and-materials work. For project work, many engineers take 30 to 50 percent upfront, and require full prepayment or a deposit for hardware orders so they are not financing equipment. Larger builds are sometimes split into milestones such as design approval, hardware delivery, and cutover. Monthly retainers are usually invoiced in advance on the first of the month. Late fees of 1 to 1.5 percent per month are common if stated in the agreement. Payment is typically by ACH, check, or credit card, and card fees are sometimes passed on for large hardware invoices.
Get a deposit that covers equipment cost before placing orders. Network gear is expensive and often non-returnable once opened or licensed, so you do not want to carry that cost while waiting on payment.
Diagrams, IP plans, configuration backups, and password handoff documents take real time. List them as their own line so they are treated as part of the deliverable and not free extras.
A one- or two-hour minimum covers drive time, setup, and the disruption to your schedule. State it in your agreement and show it on the invoice when it applies.
Once a build is finished, further changes and troubleshooting should move to hourly or a retainer. Note the cutover date on the final invoice so the line between warranty-type fixes and billable support is clear.
Renewals for firewall subscriptions and support contracts can be invoiced 30 to 45 days before they are due. This avoids lapses in coverage and gives the client time to approve the cost.
Use hourly for open-ended troubleshooting and unclear problems. Use a flat fee when the scope is well defined, such as a firewall swap or an office build with a known device count. If you quote a flat fee, write down exactly what is included and set an hourly rate for changes.
Resellers commonly add 10 to 25 percent over their cost. The markup covers sourcing, configuration, shipping handling, warranty management, and the risk of returns. Be upfront about it, and some clients will prefer to buy equipment themselves while you bill labor only.
Yes, and it is common to do so. Many engineers bill travel time at a reduced hourly rate or include a trip charge beyond a set radius, plus mileage. Put the policy in your service agreement so it is not a surprise.
It depends on the state. Hardware sales are generally taxable, but labor and IT services are taxed in some states and not in others. Check with your state revenue department or an accountant, and itemize hardware and labor separately on invoices so each can be treated correctly.
Invoice in advance, usually monthly, with a description of what the fee covers such as monitoring, patching, and a set number of support hours. If the client goes over the included hours, bill the overage at your hourly rate on the next invoice and show the hours used.
Send a Network Engineer estimate for approval, then turn it into an invoice when the work is done.
Network Engineer estimate template