Hourly or Fixed Fee on an 1890s Building? What the Two Engagement Letters Bought

The building was a three-story brick commercial block from the 1890s, load-bearing masonry on a rubble foundation, with a storefront that had been altered at least twice and a rear wall that had been repointed in the 1970s with mortar far harder than the brick around it. The owner needed two things: a structural opinion on the rear wall, and drawings good enough to bid. She hired the same firm for both, six months apart, under two different fee structures. What she learned in between is the most useful thing I have seen a client learn about professional fees, and almost none of it was about the rate.

The first engagement: hourly, with a range at the top of the page

The first letter set an hourly rate for the principal, a lower one for staff, and an estimated range for the investigation phase whose upper number was roughly twice its lower number. That range was honest. Nobody could say in advance how many openings the rear wall would need, or whether the 1970s repointing had trapped moisture deep enough to have softened the brick behind it. So the range was wide because the work was genuinely uncertain, and the letter said so in a sentence the owner read once and did not think about again.

What she did not read was the clause governing what happened at the top of the range. It did not stop work. It required notice, and notice was given, in an email that arrived on a Friday describing two more openings as advisable. She approved them, because by then she wanted the answer more than she wanted the budget. That is the ordinary mechanism, and it is not misconduct: an hourly engagement transfers the risk of an uncertain scope onto the person paying, which is defensible when nobody can size the scope, and expensive when the incentive to size it never arrives.

The consequences nobody traces back to the fee structure

The invoice was not the interesting part. The interesting part was what the hourly structure did to the owner's behavior over eleven weeks. She stopped calling. A question she would have asked in ninety seconds became a question she saved for the next scheduled meeting, or dropped, and one of the dropped ones concerned whether the storefront alteration had removed a bearing element. She also stopped forwarding documents, because forwarding documents generates review time, so the firm did not see the 1978 permit file until late, and re-drew a section it would not have drawn that way had it seen the file first.

Those are the everyday consequences. Not overbilling, which is rare and detectable, but suppressed contact, deferred questions, withheld records, and a client who begins optimizing for a low invoice instead of a good answer. On old buildings this is corrosive, because the value a preservation engineer adds is mostly in the small unscheduled exchange: the photograph sent from a phone, the observation that the mortar sample is wrong, the two-minute call that prevents a wrong assumption from being drawn to scale. Hourly billing prices exactly the behavior you most want to encourage.

The second engagement: a deliverable, a date, and a defined boundary

For the drawing phase the firm proposed a fixed fee against a named deliverable: a permit-ready set at a stated scope, existing conditions documented to a stated level, two rounds of owner comment, coordination with the mason of record, and a listed set of exclusions that included hazardous materials survey work, anything triggered by the lead paint rules that the Environmental Protection Agency is responsible for in pre-1978 housing and child-occupied facilities, and any redesign arising from a change the owner initiated after the second comment round. The fee was not cheap. It was knowable, which turned out to matter more.

The behavioral change was immediate and slightly comic. She called constantly. She sent the 1978 permit file, the photographs from her father's tenancy, the mason's invoice from 2004 with the mortar mix written on the back. None of it cost her anything at the margin, so all of it arrived, and two of those items changed the drawings. The firm, for its part, ran the phase tighter, front-loaded the site visits, and asked for decisions in batches, because under a fixed fee the firm now owned the cost of rework and had every reason to prevent it.

What changed recently, and why it changed

Fixed-fee phases were unusual on small rehabilitation projects a decade ago and are now common, and the reasons are mostly external to the design professions. Lenders and insurers began asking for deliverables rather than efforts, so a construction loan draw schedule now references a permit set at a defined completeness rather than an allowance for professional services. Municipal review has become more prescriptive about what a submission must contain, which makes the scope of a drawing package easier to describe in a sentence, and a scope you can describe is a scope you can price. Documentation tools also cut the hours the same package consumes, and firms that kept billing hourly watched their revenue fall for work of unchanged value.

So the shift is not ideological. It followed the moment the deliverable became standardized enough to define, and it has spread fastest exactly where definitions are firmest: permit sets, condition assessments to a published standard, closing work, entity formation, a tax return. Hourly billing survives, appropriately, where the boundary genuinely cannot be drawn in advance: litigation, contested insurance work, and the first look at a wall nobody has opened since 1974. The useful question is no longer which structure is better in general, but which one fits the specific phase in front of you.

How to read the letter you are about to sign

On any hourly engagement, find three things before you sign: what happens when the estimate is reached, who authorizes the next increment, and whether short calls and emails are billed or absorbed. If they are billed, ask for a small absorbed allowance for exactly that traffic, because you want the two-minute call to happen. On any fixed-fee engagement, read the exclusions twice and the deliverable description three times, since the fee is only as good as the noun it attaches to, and a set described as schematic is not a set you can bid. Then ask the firm which phases it would rather price by the hour. The answer tells you where the real uncertainty sits, which is the information you were hiring them for anyway.

The owner's rear wall was rebuilt in the spring with a lime mortar matched to the original, and the storefront question turned out to have a straightforward answer. She now splits every engagement she signs: investigation by the hour, with a hard notice point, and production at a fixed fee against a named document. It is the arrangement the case argued for, and she reached it by paying for both.