Delaware contractor license verification API

Look up any Delaware contractor license by number or by business name and get one normalized JSON record back, sourced from the Division of Professional Regulation (DPR).

Try a free lookup — no signup, right here on this page. For programmatic access, take a free API key — 250 requests a month, no card. Also on RapidAPI and, if you would rather not write code at all, the Apify Store.

Look up a license by number

curl "https://contractor-license-verification2.p.rapidapi.com/v1/licenses/DE/HM-0011434" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: contractor-license-verification2.p.rapidapi.com"

HM-0011434 is a real DE license (TREVOR OLIVER), so you can run that call as written.

Search by business name

curl "https://contractor-license-verification2.p.rapidapi.com/v1/licenses/DE/search?name=ACME&limit=10" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: contractor-license-verification2.p.rapidapi.com"

Partial, case-insensitive match. A search hit returns the same full record as a lookup by number, so there is no second call to make.

What Division of Professional Regulation publishes

• License status, plus DPR's own raw wording
• License type — master electrician, journeyperson, master plumber, master HVACR, elevator mechanic, manufactured home installer
• Issue and expiration dates
• The licensee's name
• City, state and ZIP

What it does not

• General contractors — Delaware does not license them
• Company names — every trade license is held by a person
• Street address
• Surety bond
• Workers' compensation
• General liability insurance
• Disciplinary actions

Every response carries a data_completeness map saying which fields this source actually supplies, so an absent bond reads as “not published” rather than “no bond”. Records are never padded with guesses.

Before you build on it

Delaware licenses people, not companies. There is no state contractor license at all — a construction business needs a Division of Revenue business license, which is a tax registration and says nothing about competence — and the trade licenses DPR does issue name an individual. So look up the master electrician, not the electrical company: the company is not in this register to be found, and a blank company name here does not mean a sole trader. Second, a Delaware number is a two-character prefix and a serial — HM-0011434 — and the prefix is what separates a master plumber from an electrician holding the same serial. A serial typed on its own is accepted when it is unambiguous and refused with the candidates named when it is not. Third, the file carries a disciplinary-action column that reads "N" on all 352,222 rows in it, every profession included, so it is not published here: an empty list would claim a clean record this register cannot support.

Other states

How do I check if a contractor is licensed in Delaware?

Enter the Delaware license number — or the business name if you don't have it — in the free lookup above or the API. Swanum reads the Division of Professional Regulation record and returns license status, classifications and expiration date as one JSON object.

How do I check if a contractor is licensed?

Give this API the license number if you have it, or the business name if you don't. Both return the same normalized record, so nothing downstream needs to know which one you used.

Can I look up a contractor license by company name instead of a number?

Yes — the search endpoint does a partial, case-insensitive match and can return multiple matching licenses per name.

Does this include contractor complaints or disciplinary actions?

Colorado, Illinois and California. Their feeds carry the case number, action and date — Illinois adds IDFPR's own reason — and when the state has nothing on a license you get an empty list rather than a null, so you can tell 'clean' from 'unknown'. For the other six the field is null, meaning this source does not report it — not that the contractor is clean. Oregon CCB, Washington L&I and Connecticut eLicense all publish disciplinary history on the record's own page; it just isn't in the extract they publish for bulk use, so follow source_url for those three.

Is there a free way to try contractor license verification?

Yes — the free lookup page needs no signup at all, and a free API key gives you 100 requests a month with no card. The API also has a free tier on RapidAPI.

Which states does this cover?

CA, CO (electrical and plumbing trades only), CT, FL, IL (roofing contractors only), NYC, OR (general contractors from the CCB, plus electricians, plumbers and the boiler and elevator trades from the Building Codes Division), TX, and WA. New York is New York City only; New York State itself issues no statewide contractor license.