Every rehabilitation budget contains two versions of the same mechanical scope, and they rarely agree. One version is a trade quote: a specific number from a contractor who has walked the basement, opened the panel, and looked at the flue. The other is a contingency: a soft allowance, usually expressed as a percentage, intended to absorb whatever the quote missed. In newer construction the gap between the two is usually modest. In older housing stock it can be the difference between a project that closes out on budget and one that stalls with the walls open and the meter still shut off.
The confusion is understandable, because both numbers live in the same construction budget and both get described in the same language of “allowance.” But they answer different questions. A quote answers a scope question: what will this specific work cost in this specific building? A contingency answers a risk question: how wrong might we be, and what does being wrong cost? When the second is used to avoid asking the first, the contingency stops being a cushion and quietly becomes the budget. That is how investors end up spending five figures on a system nobody ever priced.
Mechanical systems carry most of that risk. Electrical service, heating equipment, ductwork, and plumbing are the four categories that cannot be deferred, cannot be disguised with paint, and cannot be value-engineered down to nothing without breaking code or livability. They also sit behind walls, under slabs, and inside chases, which means the cost of discovering their true condition rises sharply once demolition has begun.
What an Accurate Trade Quote Actually Contains
A mechanical quote worth underwriting is never a single line item. An electrical quote should identify the service size and the condition of the existing panel, the grounding and bonding situation, available capacity after a load calculation, the condition of branch wiring, and — critically — what will be replaced versus what will be reused. An HVAC quote should name the approach rather than assume one: ducted, ductless, or a hybrid, with equipment sizing, the condition of existing ductwork, and a realistic assessment of whether the distribution system can be sealed or extended. A plumbing quote should separate fixture replacement from drain line work and state plainly what will be inspected versus what will be discovered.
Good quotes also disclose their own edges. They should cover:
- The permit path and the inspection sequence
- Access requirements, including how equipment gets into a basement or onto a roof
- Removal and disposal of old panels, boilers, furnaces, and piping
- How concealed conditions will be priced once they are opened up
Unit rates for opening a wall, replacing a section of drain, or adding a circuit are far more useful than a lump sum accompanied by a verbal promise to “work with you.” A quote with defined unit rates lets an investor model the downside. A quote without them simply relocates the argument to the middle of construction, when the leverage has already shifted.
Why Older Housing Stock Punishes Averages
Philadelphia rowhomes and comparable older stock were built across several eras and then modified by several generations of owners. It is common to find partial upgrades layered over original work: a newer panel fed by older service conductors, a furnace replaced without addressing the distribution system, a finished basement built over drains nobody has ever inspected. None of this shows up in an average cost per square foot. Averaging assumes a population of similar buildings, and older housing stock is precisely the population where similarity breaks down.
This is the argument at the center of a Realty Times article featuring Allen Spearman, who makes the case that mechanical systems — electrical panels, heating, ductwork, plumbing — decide whether a rehab makes money, and that cosmetic budgets routinely mislead investors. The piece works through the specific mechanics of that claim: undersized electrical service in older Philadelphia rowhomes, the HVAC choices available when a building has no ductwork, plumbing and drain due diligence, permitting, and the practice of pricing mechanical work before an offer rather than after closing.
That perspective comes out of direct operating experience. Allen Spearman is a Philadelphia business owner whose work spans HVAC and electrical contracting, property development, and commercial services. He owns and runs All HVAC and Electrical, LLC, founded in 2017, and Spearman Properties, founded in 2004. He is a master electrician and HVAC technician and installer, and through Spearman Properties he has rehabilitated more than 100 properties in the region. His first venture, Restaurant Cleaning Services, was founded after his 1998 graduation from college and served diners and restaurants in greater Philadelphia; he earned his degree from Penn State University. He was also the state’s first certified Aeroseal agent for duct sealing, and he has advocated for migraine research through Miles For Migraine events.
Contingency as Risk Capital, Not a Substitute
Once real quotes exist, the contingency can be sized honestly. That means separating two kinds of unknowns. The first kind is a known unknown — a condition the contractor identified but could not fully verify without opening something up. These deserve unit-priced allowances, because their probability and their cost can be estimated within a range. The second kind is genuine risk capital, held back for surprises nobody predicted. Folding both into a single percentage hides the fact that the first kind is largely knowable before an offer and the second kind is not.
There is also a sequencing benefit to spending diligence money early. A walkthrough with an electrician and an HVAC contractor before the offer costs a fraction of the same walkthrough conducted after closing, because the purpose has changed. Before the offer, the goal is to price the work. After closing, the goal is to survive it. Investors who price mechanical work before writing an offer negotiate from information. Investors who lean on a contingency negotiate from hope, and generally pay for the difference at the worst possible moment — when the drywall is up, the inspection is scheduled, and the lease date is fixed.
That is also when trade capacity becomes a constraint. A contractor who can be scheduled in three weeks during the diligence phase may be booked out for two months by the time the property is under contract. Buyers who want a mechanical scope priced against a specific address can send the details through the Allen Spearman contact page for project inquiries, which tends to be more productive than waiting until the building is already owned and the budget is already committed.
Reading Public Work Before You Commit
Mechanical underwriting is ultimately a judgment about people as much as equipment. An investor is deciding whether a contractor’s assessment reflects the building or reflects a template pulled from the last job. Public work is one way to calibrate that judgment before a site visit is scheduled. His Allen Spearman X profile and his Allen Spearman Facebook profile are both publicly visible entry points for anyone who wants a sense of the person behind the quote. Neither is a substitute for walking a basement with a flashlight, but both are cheaper than a mistake.
The practical takeaway is not that contingencies are useless. They are necessary, and well-run projects hold real reserves. The takeaway is that a contingency responds to uncertainty; it does not replace information. Every dollar spent pricing the panel, the heating plant, the ducts, and the drains before an offer buys down the chance that a percentage line has to absorb a discovery nobody priced. In older housing stock, that trade — diligence now against surprise later — is usually the best deal available on the entire project.
A Gothenburg marine-ecology graduate turned Edinburgh-based science communicator, Sofia thrives on translating dense research into bite-sized, emoji-friendly explainers. One week she’s live-tweeting COP climate talks; the next she’s reviewing VR fitness apps. She unwinds by composing synthwave tracks and rescuing houseplants on Facebook Marketplace.