List-Building Audit — What We're Overthinking
Top-to-bottom review of the signal engine and target-list approach. Written 2026-04-17 after a day of signal design, dry-runs, and bouncing questions.
1. The single most important insight
We are trying to invent signals that detect companies the industry has already pre-qualified.
Manufacturers, trade associations, and state agencies already publish lists that filter for revenue, reputation, and operating scale. Starting from those lists is 10–100× cheaper than scoring the whole SMB universe and guessing.
For Design Precast specifically, the NPCA producer member directory is the list. Everything else is a re-derivation.
2. What we are making too hard
| Overthinking | What we should do instead |
|---|---|
| Building custom gatherers for every signal | Start with pre-qualified lists, only score inside them |
| Scoring every company on fit | Assume fit; score only on sell-intent |
| Inventing sell-intent proxies from web scrapes | Use real trigger events: SBA loan defaults, probate, license lapses |
| Verifying $15M–$50M revenue from weak proxies | Use dealer/association membership as a revenue floor |
| Paid vs. free signal debates | Budget-first; let Claude pick from a menu |
| Building the signal registry from scratch | Import PCI / NPCA / ENR / state DOT lists as "seed signals" |
3. Published marquee lists we are not using
General construction / trades (cross-vertical)
- ENR Top 600 Specialty Contractors — every company on this is $30M+. Public, annual. Named by trade.
- ENR Top 400 Contractors — the GCs. Public.
- Qualified Remodeler TOP 500 — vetted, revenue $5M+ for inclusion.
- Roofing Contractor 100 — annual list from Roofing Contractor magazine.
- ACHR News Top Mechanical Contractors — HVAC/plumbing.
- Professional Remodeler Top 200, Modern Contractor Solutions Top 50, Pool & Spa News Top 50.
- ABC National Excellence Awards winners.
- Engineering News-Record regional Top Design Firms / Top Contractors.
Precast / concrete (Design Precast's own world)
- NPCA (National Precast Concrete Association) producer member directory — the canonical list. Members pay dues, represent real producers.
- PCI (Precast/Prestressed Concrete Institute) producer members — higher bar, more structural.
- ACPA (American Concrete Pipe Association) producer members.
- State DOT pre-qualified precast supplier lists — public, by state DOT, free.
- NCMA (National Concrete Masonry Association) producer members.
Manufacturer authorized dealer / certified contractor programs
(Inclusion usually implies a revenue floor, credit check, insurance minimums, and training investment — pre-qualifies the business)
- Roofing: GAF Master Elite, Owens Corning Platinum Preferred, CertainTeed Master Shingle Applicator, TAMKO Pro Certified
- HVAC: Trane Comfort Specialist, Carrier Factory Authorized, Lennox Premier Dealer, Mitsubishi Diamond Contractor, Bryant Factory Authorized
- Plumbing: Kohler Certified, TOTO Total Design, Pentair Platinum
- Siding/windows: James Hardie Elite Preferred, Pella Certified, Andersen Circle of Excellence, Marvin Authorized
- Equipment: Caterpillar dealer territories, John Deere construction dealers, Komatsu distributor network (tells you who buys $500K+ machines)
Trade association member directories
- NAHB (home builders), AGC (general contractors), NRCA (roofing), ACCA (HVAC), PHCC (plumbing/heating/cooling), NECA (electrical), SMACNA (sheet metal), MCAA (mechanical), ABC (merit-shop), AGA (gas), APA (engineered wood).
- Why these matter: annual dues, event attendance, certification upkeep → implies a real going concern, not a 1-truck operation.
State & federal public data
- State contractor license databases — filterable by bonding capacity. Free. Every state has one.
- State DOT pre-qualified vendor lists — free, by state, by trade.
- SAM.gov prime contractor registrations — free, shows federal work.
- SBA 7(a) and 504 loan recipient lists — public, implies $5M+ business with financials passed underwriting.
- FMCSA carrier database — for anything with trucks, has revenue-correlated fleet size.
- OSHA Establishment Search — site counts and employee counts, free.
- EPA facility registry — for anything with environmental permits.
- USPTO patent holders — signal of sophistication/moat.
- State workers comp class codes & premium data — payroll proxy.
Sell-intent triggers (real, not inferred)
- Probate filings (owner deceased) — county-level, public.
- SBA loan defaults and UCC-1 filings — distress signal, public.
- Contractor license lapses / non-renewals — state databases.
- DOT authority revocations — FMCSA.
- Commercial real estate listings for the plant/yard — LoopNet / Crexi scraping.
- Divorce filings of known owner-operators — county courts (edge case, but real).
- Business-for-sale listings — BizBuySell, Axial, DealStream. These are owners who already raised their hand.
4. Cheap paid data that skips half our work
| Source | Roughly | What it gives you |
|---|---|---|
| Data Axle / InfoUSA | ~$1–2k flat for 10k companies | NAICS + revenue + employees + owner name + phone. One-shot lists. |
| Reference Solutions (public library card) | Free via many libraries | Same data as Data Axle, free for residents. Most under-used asset we have. |
| IBISWorld industry report | ~$900/report | Names the top 5–10 companies in each industry with revenue. |
| BizMiner vertical report | ~$200 | Same idea, deeper financial benchmarks. |
| Apollo.io | $49–99/user/mo | Contact data, revenue ranges, tech stack. |
| Crunchbase Pro | $49/mo | PE ownership flag (solves one of the Y/N questions outright). |
| LinkedIn Sales Navigator | $99/mo | Headcount, hiring velocity, owner tenure. |
| D&B Hoovers | $75–200/mo | Revenue ranges for private SMB. |
| Blue Book Network (construction) | varies | Named specialty contractors by region, with scope & history. |
| SafeGraph POI | free sample tier | Foot traffic for retail-ish verticals. |
| OpenCorporates | free → paid API | Entity graph, officers, filings — great for PE roll-up detection. |
The punchline: a $2,000 Data Axle pull for "precast concrete manufacturers, USA, 20+ employees, independently owned" probably beats 100 hours of gatherer-building.
5. What's missing from our current thinking
- Owner demographics > firmographics for sell-intent. Age of owner, years in business, LinkedIn tenure — these predict sale readiness far better than web signals. Voter registration records give age for free in many states.
- PE/search-fund exclusion is a data pull, not a signal. Crunchbase + PitchBook Basic answers this deterministically. Stop trying to infer it.
- The "marquee" shortcut. If a company shows up in any national trade award, they are >$15M. Period. Save the signal spend.
- Vertical partner supplies the seed list. Cress (CII) already knows every precast producer worth a letter. The engine's job is to rank and enrich his list, not discover one.
- The DNC list is a data model, not an afterthought. One table, globally enforced. Every tool writes to it, every query reads from it.
- Distributor relationships. Ferguson, HD Supply, Winsupply, White Cap, Hajoca — their top-tier customer lists are gold, and sometimes accessible through a vendor partnership or rep-firm introduction. Not scrapable — relational.
- Surety bonding capacity. Bonded capacity is public for government-work contractors and scales directly with revenue. Surety agents publish client lists as marketing.
- Franchise FDDs. Every franchise system files public FDDs listing every franchisee with contact info. For restoration, pest, lawn, auto-glass, etc. — the list already exists.
- Buying groups and co-ops. PRO Group (outdoor power), Distribution America, Affiliated Distributors — membership = scale threshold.
- Apprenticeship program participants. Listed by state DOL. If a company has registered apprentices, they have real employees and a multi-year horizon.
6. Reshape of the approach (proposed)
Phase 1 — Seed (per vertical, one-time):
- Buy / pull the one canonical association directory (NPCA for precast, NRCA for roofing, etc.).
- Cross-reference with state contractor license DB + state DOT pre-qualified list.
- De-dupe, geocode, attach NAICS. This is the base universe. ~500–5,000 companies per vertical.
Phase 2 — Exclude (cheap, deterministic):
- PE-backed → Crunchbase lookup, auto-exclude.
- DNC list → auto-exclude.
- Recently acquired (last 24 mo) → Crunchbase / Axial / PitchBook, auto-exclude.
- Public company → skip.
- <$15M revenue proxy (employees < 15) → skip or defer.
Phase 3 — Rank (signal engine, but on a small universe):
- Owner age / tenure (sell-intent).
- Multi-generational flag.
- Geographic adjacency to acquirer.
- Trade/product adjacency.
- Trigger events (probate, distress, license lapse).
- Marquee status (award lists) → fit confidence booster.
Phase 4 — Enrich only the top N: Only after the list is ranked and sliced to ~50, run expensive enrichment (Exa, LinkedIn scraping, phone append). Stops us spending $3.50 × 5,000 companies.
7. The single cheapest thing we can do this week
Pull the NPCA producer member directory and the state DOT pre-qualified precast supplier lists for MS, LA, AL, GA, SC, NC, TN, FL. De-dupe. That is the Design Precast universe — a hand-counted ~200–400 companies, and the engine's first real job is just ranking that list.
No $3.50/company gatherers needed. No 33-signal battery. Just: which 30 of these 300 are most likely to sell in the next 18 months, and which are closest to Design Precast geographically and operationally?
That is a solvable problem with the data already in hand plus one afternoon of public-list fetching.
8. Questions back to Mark and Ewing
- Is there budget (~$2k) for a Data Axle / Reference Solutions pull per active vertical? It likely replaces 80% of the gatherer work.
- Do we have (or can Cress provide) the NPCA producer list for precast right now?
- Should the engine's v1 output be a ranked version of Cress's seed list, not an independently-generated target set?
- Do we want the DNC list + PE-backed exclusion list as the first two database tables built this week, before any more signals?
- Which vertical partner (after CII) has a canonical directory we can seed from — HR.com for HR services? A roofing partner? This shapes the pattern.