The engineering brain-work — so the job gets built right.
I do the calculations, the sizing and the specification that make a heating or cooling system correct — then hand it over for your team to install, and stay on call for any questions. You get a fully qualified engineer’s judgement on the design, without paying engineer’s rates to fit the pipework. Most systems fail because nobody did the maths. I do the maths.
Pay me for the thinking. Pay your plumber for the fitting.
The expensive way to get a system right is to pay a fully trained engineer to do everything — the calculations, the design and the physical installation. The smart way is to split it: I do the engineering — the loads, the sizing, the specification, the checks — and your own plumber or installer does the hands-on work, guided by it.
It costs the contractor far less, and the job still gets built to a proper design rather than to guesswork. I’m available throughout for clarifications, and for a check before or after the work if you want one. This is the work I do best and want to do — the engineering and the problem-solving, not lagging pipe at the top of a ladder.
A system that wasn’t calculated is a system that was guessed.
Across years of servicing properties built to other people’s specifications, I keep meeting the same problem: the heating or cooling was never actually calculated. It was sized by rule of thumb, by what fitted the budget, or by copying the last job. When it underperforms, the customer is told it’s “just how it is” — or sold more kit to mask the original mistake.
A proper calculation removes the guesswork. It gives the real heat loss of each room, the genuine load on the plant, the correct pipe and emitter sizes, and the flow temperatures the system needs to run at. Get that right on paper and the system behaves — quiet, efficient, and warm where it’s meant to be. Get it wrong and no amount of callbacks will fix it. This is what proper heating system design in Luton and the surrounding counties should mean: a system calculated for the building, not guessed at.
Five things that make a job correct — and profitable.
The numbers the whole design rests on
Room-by-room heat loss to BS EN 12831 and proper cooling load calculations — worked by hand to the CIBSE Domestic Heating Design Guide, using the real figures for the building rather than a default template.
Sized properly, not by habit
Pipe and emitter sizing worked from pipe run length, internal resistance, flow rate and noise — pumps and flow temperatures matched to suit. Strainers and dirt separators specified correctly for the pipework and the appliance: on a heat pump, where higher constant flow is needed, that often means a larger strainer or a strainer paired with a dirt separator. Judgement from the field, not just the textbook.
So you get quoted for the right job
The exact specification a job should be built to, written out clearly. Landlords and clients can then get installation quotes against a proper spec — comparing like with like, instead of quotes where corners have been cut to show a smaller number that misses what the job actually needs.
Win the job at the right price
From drawings and a site visit, an accurate build-up of materials and a work schedule in man-days. You drop in your own day rate to reach the final price — so you tender on a number that protects your margin and reflects the real work, instead of guessing and swallowing the difference.
Cut the cost of installing it — and of running it
Before sizing more kit, I look at whether the building’s heat loss or heat gain can be reduced in the first place. Often it can — which means smaller plant, lower installation cost, and lower bills for the life of the system. I use calibrated measuring equipment, including thermal cameras and flow meters, so the advice is based on what the building is actually doing, not assumptions.
By hand, to the standard — so every figure is defensible.
The building, as it actually is
Dimensions, fabric, exposure, ventilation, intended use — the real inputs, gathered from drawings or a site visit, not assumed.
Calculated to the CIBSE method
Heat loss to BS EN 12831 and cooling loads worked through by hand to the CIBSE Domestic Heating Design Guide — so every figure can be traced and justified, not taken on trust from a black box.
Turned into a buildable specification
The numbers become pipe and emitter sizes, flow temperatures, plant selection, a written specification and basic schematics your installer can work straight from.
Explained, and on call
You get the results in plain English, and I stay available for clarifications during the work — and for a check before or after, if you want one.
Contractors, landlords and owners who’d rather get it right first.
- Contractors & installers — get the engineering done properly, keep the labour in-house, and tender on a price that holds.
- Landlords & property managers — specifications written so you can get clear, like-for-like installation quotes.
- Property owners — a quote that doesn’t feel right, checked by someone independent before you commit.
This is a paid professional service.
Design, calculation and estimating are charged as a service in their own right — quoted per project once I understand the building and what you need. They are not a free add-on to an installation. What you’re paying for is the engineering judgement that makes a job correct, cheaper to run and more profitable to win. Tell me about the project and I’ll give you a clear quote.
Tell me about the project.
Send the drawings, the plans, or just the problem — and I’ll tell you what the calculation and design work involves, and what it costs.
Call 07864 757929
Email office@bson247.co.uk
Building Services ON 247 — Luton. Mechanical & electrical design and calculation, by the engineer who does the thinking.