Rules
Part of Preservation contractors: nineteen trades and how to find them
A preservation contractor's finished work tells you more than a pitch
How to read a preservation contractor's past work in 2027: how to judge a contractor by their finished projects, what to look for on site, which references tell you.
What to take away
- Photographs prove nothing. Go and look at finished work, preferably work that is several years old.
- Train your eye before you go. You cannot judge a repair if you cannot read the building.
- The most useful reference is a client whose project had a problem.
- Ask what the contractor would do differently. A thoughtful answer is a better signal than a flawless record.
Licenses and insurance tell you a firm is legitimate. Only finished work tells you whether it is good. This is how to read it, and it is a skill worth acquiring once because it applies to every trade you will ever hire.
Train your eye first
You cannot evaluate a porch repair without knowing what the porch should look like. Spend an hour learning the vocabulary of the styles in your area: proportion, trim profile, window pattern, roof form and typical materials by period.
Public collections make this easy. The federal buildings service publishes an illustrated walk through American architectural styles from Federal through mid-century Modern, naming the features that define each one. An hour with that page changes what you notice on a site visit.
Go and look at real buildings
Publicly accessible historic buildings are free training. The same agency maintains a searchable directory where you can find historic federal buildings by state, type and architect, which is a way to find well-documented examples near you and to see maintained historic fabric up close.
Then apply the same attention to your candidate's work.
What to look at on a finished job
| Element | What good work looks like |
|---|---|
| Repointed masonry | Joint profile and color match, brick edges undamaged |
| Repaired wood | Splices tight, grain direction right, no visible filler shrinkage |
| Paint on exterior woodwork | Sound after several winters, no early failure at joints |
| Replaced elements | Match the surviving originals in profile and dimension |
| Flashing and rainwater goods | Neat, correctly lapped, discharging away from the wall |
| The parts nobody sees | Back elevation, basement, roof edge, all finished properly |
Old work is more informative than new. Anything looks good on the day it is finished; five winters later, the differences are obvious. Early failure at the joints usually means preparation was skipped, and preparation is what decides how long a coating over old material lasts.
Stand back thirty feet, then walk up close. From a distance, you see if the repair reads as part of the building or as a patch. Up close, you see the craft.
Work that passes both tests is rarer than portfolios suggest, and you are paying for that. Such firms are booked furthest ahead, which is why the call to make is in the previous season.
Reference questions worth asking
- What went wrong, and how was it handled?
- Did the price change, and why?
- Who was on site day to day?
- Would you use them again for a different kind of work?
- What do you wish you had asked before signing?
The fourth question is the sharpest. A reference who would rehire for masonry but not for carpentry has just told you the firm's real specialty, and told you more precisely than any brochure would.
The verification checks that pair with this look at past work are in our contractor vetting walkthrough, and the map of specialties is in the nineteen preservation specialties.
