Retainer tracking for engineering consultants and PE firms.
Engineering consultants retained for ongoing technical advisory — structural review, MEP oversight, civil site consulting — bill clients by the hour against a monthly or quarterly retainer. Clients who’ve paid $5,000–$25,000 in advance want to know what they’ve consumed before adding scope or requesting another site visit. The problem: engineering billing cycles are irregular, with quiet months followed by intensive review periods. Without a live balance, clients can’t tell whether an expensive month is unusual or expected. HourTab gives them a live URL that shows both the running total and the itemized log of every site visit, review session, and coordination call.
Free forever for your first retainer · no credit card.
Why engineering retainer tracking breaks down
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Site visits and reviews have wildly different hour counts — clients need context, not just a number.
A 1-hour site visit and a 12-hour HVAC system review both appear in the same billing cycle as hours consumed. When a client sees they’ve used 18 of 20 retainer hours in week two and doesn’t know it was because of an intensive structural drawing review, they question the billing. An itemized log that shows “structural review — foundation drawings, 12h” next to “site visit — excavation inspection, 1.5h” provides the context that prevents that question. Clients understand intensive review cycles when they can see what the hours produced.
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PE stamp time is expensive and scrutinized — clear descriptions prevent disputes.
Licensed engineer hours are among the most expensive line items on an engineering services invoice, and clients know it. When a PE spends 6 hours reviewing structural calculations and the client only sees “engineering review, 6h” on their month-end summary, they wonder what exactly was reviewed and whether 6 hours was warranted. A detailed entry description — “PE review — moment frame calculations, floors 3–7, 6h” — makes the work legible. The more specific the description, the less likely the client is to push back on the hours.
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Multi-discipline retainers need a shared balance view to prevent over-consumption.
On large development projects, structural, mechanical, and civil engineers may all bill hours against one owner’s retainer. Without a shared balance view, each discipline logs hours independently and no one has visibility into the aggregate until the invoice arrives. A single HourTab URL showing all three disciplines’ entries — tagged by type — gives the owner a running picture of total consumption. When structural hits 80% of their allocated share mid-month, the owner knows before approving another round of review, not after.
How it works for engineering consultants
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Set up the retainer. Enter the client or project name, the monthly or quarterly hour cap, and the billing cycle. For a multi-discipline retainer, you can create one combined entry or separate per-discipline retainers under the same client — whichever gives the client the clearest view of their total exposure.
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Import from your time tracker CSV. Export time entries from Toggl, Harvest, Clockify, Deltek, or Mavenlink and paste the CSV into HourTab. Each entry populates the client-facing work log: date, scope item (e.g. “Structural review — foundation drawings” or “MEP coordination — HVAC riser diagram”), hours, and remaining balance. Your internal project accounting workflow stays unchanged.
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Share the URL. Drop the unique public link into the kickoff email or first invoice. The client bookmarks it and checks their running balance before requesting additional site visits or review cycles. Irregular consumption — the big review month followed by a light coordination month — becomes understandable when clients can see the log and read what drove each spike.
A public balance URL makes irregular consumption visible — clients understand the pattern instead of questioning the invoice.
“Engineering clients on retainer often lose track of their remaining hours, especially on projects with irregular activity patterns — quiet months followed by intensive review cycles.”
— Engineering consultant practice guide
A public balance URL makes irregular consumption visible — clients understand the pattern instead of questioning the invoice.
Frequently asked questions
How do engineering consultants typically track retainer engagements?
Most engineering consultants track time in Deltek, Mavenlink, BST Global, Toggl, or Harvest — or in a spreadsheet. Hours are logged internally per project, but clients have no visibility unless the consultant sends a monthly status report. HourTab adds a live public URL on top of that workflow so clients can check their balance and work log at any time, without waiting for a report or making a call.
Can I show entries by discipline (structural, mechanical, civil) separately?
Yes. Each CSV row becomes a line item in the client’s work log. Include the discipline in the entry description — “Structural — foundation review, 4h” or “MEP — HVAC system coordination, 6h” — and clients see the discipline breakdown across the billing cycle. For multi-discipline teams billing against a single owner’s retainer, this is the clearest way to show how the hours were distributed.
Does HourTab work with Deltek, Mavenlink, or BST Global?
Yes, via CSV export. Deltek Vantagepoint, Mavenlink (now Kantata), BST Global, and most engineering project management platforms support time entry CSV exports. Export entries for the relevant client engagement, import into HourTab, and the client-facing URL updates. Your internal project accounting workflow stays exactly the same.
What happens when a client consumes more hours than the retainer allows?
When the retainer balance hits zero, the HourTab URL shows the overage clearly — hours consumed beyond the retainer amount are flagged as billable at the standard rate. Because the client has been watching the balance approach zero, the overage conversation is expected rather than a billing shock at month-end. You can also set threshold alerts on HourTab’s Studio plan to notify the client (or yourself) when 80% of hours are consumed.