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Renewal, phase by phase
Replacing heating and cooling plant in a building that stays open. Six stages, each one with a defined end, and nothing ordered until the scope is agreed in writing.
Six stages
Every stage closes before the next opens. If one of them turns up something that changes the job, the scope gets reissued rather than absorbed quietly into the price.
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01
Survey
On the roof or in the plant room, with the panels off. Condition, model and serial numbers, curb and access, how the unit comes off and what it comes off with, electrical supply and isolation, what the controls do, and which hours you can genuinely give us. Photographed throughout.
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02
Written scope
What is being replaced, what is being kept, and — the part most scopes leave out — what is explicitly not included. Curb adaptation, structural work, roofing, electrical distribution and asbestos are named as in or out, not left to be argued about later.
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03
Permit
Filed with the city or county that covers the address. Arvada, Westminster, Wheat Ridge and unincorporated Jefferson County each have their own process; we file with the right one and we do not begin until it is in.
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04
Phasing
The work broken into pieces that each fit the hours agreed at survey. The rule is simple: every phase ends with the building conditioned. Where that is not possible, temporary heating or cooling is written into the scope and priced, not improvised on the night.
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05
Commissioning
Airflow, temperature rise or split, static pressure, economiser travel and minimum position, control schedule and safeties. Numbers, recorded per unit, handed over rather than kept.
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06
Handover
Model and serial numbers, filter sizes, belt part numbers, the control schedule as left, the permit and the commissioning sheets. Enough that a different contractor could pick it up, which is the only real test of a handover.
Questions worth asking any contractor
Including us. If a renewal proposal cannot answer these, it is not finished — and the gaps are where the extra invoices come from.
- What is explicitly out of scope?A scope that names nothing as excluded has simply moved the argument to later.
- Who is filing the permit, and with whom?The wrong jurisdiction is a delay you find out about on the day.
- Does the existing curb fit the new unit?If it does not, an adapter is either priced or it is a surprise. There is no third option.
- How does the old unit come off?Crane, street closure, weekend permit — all of it is cost and all of it is knowable at survey.
- What happens if a phase overruns?Ask what the fallback is for heating or cooling the building on Monday morning.
- What numbers will I be given at the end?If the answer is not specific, the commissioning probably will not be either.
Why there are no prices on this site
A rooftop unit replacement can differ by a multiple depending on access, curb, electrical supply, crane time, hours and controls. A figure published here would be a guess dressed as information, and we would rather give you a real one after the survey. The survey itself is what we quote first, and that quotation is a fixed number.