MEP engineers send a fee proposal before any design starts, usually after a request from an architect, developer, contractor, or building owner who is comparing several firms. Clients look at total fee, what drawings and calculations are included, the schedule, and how changes are handled. A clear proposal also doubles as the scope of the contract.
When to use estimates: Use estimates to provide project quotes and get client approval before starting work. Once approved, convert your estimate to an invoice with one click to collect payment.
Create an invoice for payment collection
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Invoice_1001_Client_2026-10-14.pdf
Clients often assume fire sprinkler design, fire alarm, lighting controls, or low-voltage are included. State which ones are in and which are by others.
List each phase and what is delivered, such as stamped permit drawings, specifications, load calculations, energy compliance forms, and one round of review comments.
State the building area, existing system conditions, utility capacity, and code edition you assumed. If these prove wrong, the fee can be adjusted.
Site visits, design meetings, and construction-phase visits cost time and travel. Set a number included and a rate for additional ones.
Define how many rounds of review are included and that owner or architect changes after approval are additional services.
Specify whether responding to plan check comments is included, and for how long after submittal.
Name items not included, such as commissioning, energy modeling, utility applications, and field-testing. List how printing, permit fees, and travel are billed.
Link your timeline to receiving architectural backgrounds, surveys, and decisions on time, so delays on the client side do not become your cost.
| Service | Priced | Typical range |
|---|---|---|
| Principal / PE engineer time | per hour | $150-250 |
| Project engineer or designer time | per hour | $95-160 |
| CAD / Revit drafting technician | per hour | $65-110 |
| Existing conditions site survey and report | flat fee | $800-3,500 |
| Tenant improvement MEP design (small office or retail) | per sq ft | $1.50-4.50 |
| Heating and cooling load calculations (Manual J/N style or ASHRAE) | flat fee | $500-2,500 |
| Permit-ready construction drawing set (small commercial) | flat fee | $4,000-18,000 |
| Construction administration (RFIs, submittal review, site visits) | per hour | $130-220 |
Typical US ranges. Rates vary by region, experience, and job size.
Estimate hours by role for each phase, then compare the total to a per-square-foot figure or a percentage of MEP construction cost. If the two are far apart, review your assumptions before sending the quote.
Renovations often have missing or wrong as-built drawings. Include a site survey line and a time allowance for field verification, or price the design after the survey is finished.
A table with fees per phase makes it easier for the client to approve work in stages and for you to invoice progress. It also shows exactly what is cut if the client asks for a lower price.
Fees depend on current workload and labor costs. State that the proposal is valid for 30 to 60 days and that the schedule begins on receipt of a signed agreement and retainer.
Use a fixed fee when the scope and drawings are clear. Use an hourly estimate with a not-to-exceed amount when conditions are uncertain, such as existing building work or early-stage projects with unsettled layouts.
Compare scope line by line first. Lower bids often leave out site visits, construction administration, or revisions. Offer to remove services or reduce deliverables rather than discounting the same scope.
Refer to the additional services clause in the agreement. Send a short written change request with the added scope, hours, and fee, and get approval before doing the extra work.
Most MEP firms provide simple proposals free. For large projects that need detailed pre-design studies, feasibility analysis, or a significant site visit, a paid pre-design phase is reasonable.
Use the MEP Engineer invoice template to bill the client, or convert this estimate once it's approved.
MEP Engineer invoice template