Revit MEP modelling
Mechanical, electrical and public health models from your architectural model, DWGs or PDFs, to LOD 200–350, with sheets, sections and schedules where asked.
Single dwelling from 5 working days; one commercial floor from 10
MEP design that gets through checking the first time.
Overflow Revit modelling, duct and pipe sizing, ventilation design and design review for UK consultancies and contractors. Fixed fees. A calculation note with every issue, so the checker can follow the numbers.
Drawn byFirst Pass MEP Ltd
StandardsCIBSE Guides B and C, DW144, BS EN 1506, Approved Document F
StatusCHECKED – FIRST PASS
RevP01
BasisFixed fee, 50% deposit
What we take off your desk
Defined packages for the work that piles up before a deadline. Each one is issued as PDF drawings or a sizing schedule plus a calculation note, under written terms, with a stated turnaround.
Ductwork and pipework sizing
Darcy–Weisbach and Colebrook–White, not chart readings. Sizes snapped to DW144 rectangular and BS EN 1506 round, velocities to CIBSE Guide B and BS 8233, index run and fan or pump duty.
Ten runs in 3 days; a floor in 5; a building in 7
Ventilation design to Approved Document F
Extract and whole-building rates, system selection, duct routes marked on your plans, terminal and fan schedule. Small commercial and residential.
Dwelling in 3 to 5 days; small commercial in 7
Plant room and riser layouts
Equipment set out to maintenance clearances, pipe and duct routes coordinated, access checked, with a schedule of what sits where.
From 5 working days
Design review and checking
An independent second pair of eyes on a consultant's or contractor's design before it goes to tender or site: calculations re-run, drawings cross-referenced, findings in a short report.
From 3 working days
Electrical small works and calculation tools
Load assessment, distribution and lighting design for small commercial projects, and calculation tools or spreadsheets built to your office method.
Quoted per job
How a package runs
Six steps, the same every time, so you know what arrives and when. Working hours are evenings and weekends; replies within one working day.
1EnquirySend the drawings you have and the deadline. Acknowledged within 24 hours.
2Fixed quoteScope, exclusions and standard editions in writing. Valid 30 days.
3InstructionSigned terms and a 50% deposit. Work starts the same week.
4DesignModelled or calculated with assumptions written down as we go.
5CheckEvery result run a second way before anything leaves.
6IssuePDFs plus a calculation note and issue sheet. Balance invoiced on issue.
Calculators we use and sell
Built for our own design work, then documented so other engineers can use them. Single HTML files that run offline; each ships with its method note and a worked example.
| Tool | What it does | Standards | Status |
|---|---|---|---|
| FCU Grille and Ductwork Sizer | Duct sizing by Darcy–Weisbach with Colebrook–White friction, Huebscher equivalent diameter, preferred sizes, linear slot grille selection. | DW144, BS EN 1506, CIBSE Guide B2, BS 8233 | Live |
| MEP Design Checker | Five calculators: ventilation, ductwork, pipework, heat pump checks, terminals. Prints a one-page check sheet per tab. | AD F, MIS 3005-D, CIBSE Guide C | Coming |
| GSHP Sizer | Vertical borehole sizing for heating and cooling from first principles, with an MCS look-up check and open-loop screening. | MIS 3005-D, MCS 022 | Coming |
| R32 Charge Limit Checker | A2L charge against room area, mounting height and ventilation, with the mitigation options worked through. | BS EN 378-1, IEC 60335-2-40 | Coming |
Tools are sold under a licence with liability limited to the purchase price. They are calculation aids for competent engineers, not a substitute for design responsibility.
Schedule of fees
Indicative starting fees for defined packages. Anything outside the schedule is quoted fixed where the scope is clear and at £55 an hour where it is not.
| Package | Includes | Turnaround | From |
|---|---|---|---|
| Duct and pipe sizing, up to ten runs | Sizing table with velocities and pressure drops | 3 working days | £[150] |
| Duct and pipe sizing, one floor | Sizing schedule, index run, marked-up plan | 5 working days | £[350] |
| Ventilation design, single dwelling | AD F rates, system selection, duct routes, terminal and fan schedule | 5 working days | £[300] |
| Revit MEP model, single dwelling | Full MEP to LOD 300, RVT, PDF plans and schedules | 7 working days | £[450] |
| Revit MEP model, one commercial floor | Coordinated model to LOD 300 with sheets, sections and schedules | 10 working days | £[950] |
| Design review | Calculations re-run, drawings cross-referenced, findings report | 3 to 5 working days | £[250] |
Fees exclude VAT, surveys, site visits, Building Control charges and manufacturer selections. 50% deposit on instruction, balance on issue, 14-day terms. One round of comments is included; further rounds are quoted as a variation.
Who does the work
One engineer, no hand-offs. You deal with the person who models, calculates and checks the package.
- Senior Building Services Design Engineer, UK residential and commercial
- MSc Renewable Energy Engineering
- Member of CIBSE; working towards CEng with the IMechE
- Revit MEP, AutoCAD, own calculation tools
- Professional indemnity insurance: £[1m], [insurer]
I'm Saad [surname], a London-based building services design engineer. Most of my work is HVAC design in Revit on UK residential and commercial projects: ductwork and pipework, ventilation, plant rooms and the coordination that makes them buildable.
Before building services I worked in process engineering in shipbuilding and automotive manufacturing. That is where the habit of checking every calculation a second way comes from, and it is why every package leaves with a calculation note a checker can follow line by line.
First Pass MEP takes overflow work from consultancies and contractors who need a defined package delivered to a date, without adding headcount.
Send an enquiry
Tell us what the package is and when you need it. Attach drawings later; a description is enough to quote from.
Working hours are evenings and weekends. Enquiries are acknowledged within 24 hours and quoted within two working days.