New Mexico to Delaware: master plumber license reciprocity
Delaware has no reciprocity agreement with New Mexico. A New Mexico master plumber applies by endorsement.
Reference only, not legal advice. Rules change; confirm with the licensing board before you apply. Full disclaimer.
Master plumber license by reciprocity (Board review of origin standards)
The board reviews your out-of-state credentials case by case. Some exam is usually still required, often only a law or code exam.
A plumber who holds a current master-level license in good standing in another state, the District of Columbia or a U.S. territory applies by reciprocity in DELPROS rather than by examination. 24 Del. C. § 1810(a) requires the Board to grant the Delaware Master Plumber license, without a Delaware trade or law exam, when the origin jurisdiction's licensure standards are substantially similar to Delaware's and the applicant submits the good-conduct evidence in § 1808(a)(3)-(5) plus the fee. If the standards are not substantially similar, § 1810(b) still keeps the applicant on the reciprocity path (no Delaware exam) but requires proof of at least seven years of practice after licensure. 24 DE Admin. Every applicant pays the $173 Plumber application fee in DELPROS, has a Certificate of Good Standing / licensure verification sent directly from each jurisdiction where they hold or have held a license, and documents experience with supervising-plumber affidavits (or W-2s / employer affidavits at the Board's discretion) when the seven-year practice showing is required. Applications are not complete until the form, supporting documents and fees are in. Holders of only a municipal license are not described in the statute as qualifying for § 1810 (which speaks of a state, D.C. or territory); those applicants should plan on the examination path: journeyman certificate plus 2 years under a master, or 7 years plus bypass tests, then the ProV master plumber exam ($100 per the 2022 CIB, 70%, three attempts, then a one-year wait). A business that has just lost its only master may obtain a 100-day temporary plumber license ($40) for an owner or employee who is applying and will sit for the next exam.
Mechanism is Endorsement because the Board compares origin statutes case by case and has no retrieved plumber partner list; the trade exam is still waived on this path (24 Del. C. § 1810), which is why examTradeRequired is false. Code 1800 § 2.0 (HVACR is 70% in § 3.1.1; the 2022 ProV CIB states plumbing exams also require 70%). No individual-license bond or insurance amount appears in subchapter II or regulation 2.0. Typical processing time is not published; complete applications are reviewed at Board meetings.
At a glance
- Trade exam
- Waived
- Law / code exam
- Not required
- Out-of-state hours
- Count toward eligibility
What you must already have
- Your New Mexico license must be active and in good standing.
- You must have no disciplinary action or unresolved complaints on your record.
- You must have held your New Mexico license for at least 7 years.Required only if the Board finds the origin jurisdiction's standards not substantially similar: at least 7 years of practice after licensure (24 Del. C. § 1810(b)).
- Origin jurisdiction's plumber licensure law and regulations submitted so the Board can decide whether standards are equivalent (24 DE Admin. Code 1800 § 2.3)
What you'll do to get licensed in Delaware
- 1Application fee. Pay the application fee ($173). Plumber application fee (examination or reciprocity), non-refundable, paid in DELPROS.
- 2Other. Certificate of Good Standing / licensure verification sent directly to the Board from each state or jurisdiction where the applicant currently holds or has ever held a plumber license (24 DE Admin. Code 1800 §§ 1.2, 2.1.3).
- 3Other. Copy of the origin state's plumber licensure laws and regulations for the Board's substantial-similarity / equivalency review (24 DE Admin. Code 1800 § 2.3).
- 4Other. Verification of experience / practice: supervising licensed plumber affidavit on the Board form, or W-2s or employer/officer affidavits at the Board's discretion; required to show 7 years of post-licensure practice when origin standards are not substantially similar (24 Del. C. § 1810(b); 24 DE Admin. Code 1800 § 2.1.2).
- 5Trade exam. Pass the destination's trade exam (if applicable). Not required on the § 1810 reciprocity path. Examination-path applicants (no qualifying out-of-state license) must obtain Board approval then pass the ProV master plumber exam. 2022 Candidate Information Bulletin: $100, computer-based, open book, 70% to pass, retake after 7 days, three attempts per application; after three failures, 24 DE Admin. Code 1800 § 2.2 requires waiting one year from the last exam before reapplying. Affiliate exam prep applies only if the applicant is actually sitting the exam..
- 6Exam fee. Pay the exam fee ($100) (if applicable). ProV exam fee from the 2022 Candidate Information Bulletin; paid to the testing vendor, not combined with the $173 DPR application fee (24 Del. C. § 1811). Not charged on the reciprocity path..
Published fees on this path total $173, excluding exam-vendor fees, bonds, and insurance.
What you'll need to buy or arrange
Exam preparation
Most boards contract PSI, Prov, or ICC for exams. Check which code edition the exam is written to before buying a prep course.
- Trade exam · if applicable
How Delaware licenses master plumbers
Delaware master plumber · “Master Plumber”
Statewide license
Delaware issues a person-held Master Plumber license through the Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners in the Division of Professional Regulation. 24 Del. C. § 1807 requires that license (or a statutory exemption) to provide plumbing services or to use the titles licensed plumber / master plumber. Employees, apprentices and journeymen work under a master's supervision without their own Board license. A new master needs a journeyman's certificate from a federally-standard apprenticeship plus two years under a master plumber (or similar-level licensee in another state), or seven years under such supervision plus the Delaware vocational-technical apprenticeship equivalency tests, then Board approval and the ProV-administered master plumber exam; the application fee is $173. Out-of-state masters apply by reciprocity under 24 Del. C. § 1810 without a Delaware exam: the Board shall grant the license if the origin state's standards are substantially similar, and otherwise requires at least seven years of practice after licensure. 24 DE Admin. Code 1800 § 2.3 requires every reciprocity applicant to submit the origin state's licensure laws and regulations so the Board can make that comparison. Licenses renew biennially; from the 2026 renewal, plumbing licensees complete 5 hours of continuing education (3 code, 1 safety, 1 cross-connections/backflow) by October 31 of even-numbered years.
Common questions
- Do I have to take the Delaware master plumber exam if I'm licensed in New Mexico?
- No. The trade exam is waived on this path.
- How long do I need to have held my New Mexico license?
- At least 7 years before applying.
- What does it cost to get a Delaware master plumber license from New Mexico?
- Published fees on this path total $173, not counting exam vendor fees or bonds.
- Do my New Mexico work hours count in Delaware?
- Yes. Documented out-of-state experience counts toward Delaware's eligibility requirements.
- Does it work the other way, from Delaware to New Mexico?
- Not necessarily. Reciprocity is directed. Going from Delaware to New Mexico, the mechanism is experience credit.
Sources
- 24 DE Admin. Code 1800 - Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners (regulations) · 24 DE Admin. Code 1800 §§ 2.0, 5.0 · Delaware Registrar of Regulations · Admin Rule · verified September 16, 2026
- 24 Del. C. ch. 18, subch. II - License: Plumbing · 24 Del. C. §§ 1807, 1808, 1809, 1810, 1811, 1812 · Delaware General Assembly · Statute · verified September 16, 2026
- Delaware Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners - Home · 24 Del. C. ch. 18 · Delaware Division of Professional Regulation · Agency Page · verified September 16, 2026
- Delaware DPR - Plumbing and HVACR Examinations (Master exam / DELPROS) · Delaware Division of Professional Regulation · Agency Page · verified September 16, 2026
- Delaware DPR - Plumbing and HVACR Fee Schedule · Delaware Division of Professional Regulation · Agency Page · verified September 16, 2026
- Delaware DPR - Plumbing Licensure (examination and reciprocity) · 24 Del. C. §§ 1808, 1810 · Delaware Division of Professional Regulation · Agency Page · verified September 16, 2026
- Delaware DPR - Temporary Plumber or HVACR License (loss of sole license holder) · 24 Del. C. § 1831 · Delaware Division of Professional Regulation · Agency Page · verified September 16, 2026
- Delaware Division of Professional Regulation - Candidate Information Bulletin (ProV, 2022.03.09) · Delaware Division of Professional Regulation / Prov, Inc. · Other · verified September 16, 2026
Verified dates are when a person last opened each source and confirmed the facts above. Cite the board, not us.