COMPANY RECORD · BOULDER, CO
Welzig Mechanical — permit history in Boulder, CO
Welzig Mechanical appears on 213 Boulder permit records from 2015 through 2026, all of them mechanical / hvac.
Permit categories
| Category | Permits | Share |
|---|---|---|
| Mechanical / HVAC | 213 | 100% |
Activity by year
| Year | Permits issued |
|---|---|
| 2015 | 2 |
| 2016 | 5 |
| 2017 | 6 |
| 2018 | 8 |
| 2019 | 18 |
| 2020 | 26 |
| 2021 | 8 |
| 2022 | 18 |
| 2023 | 27 |
| 2024 | 33 |
| 2025 | 45 |
| 2026 | 17 |
Busiest year on record: 2025, with 45 permits. One project can account for several filings, so read this as filing activity rather than workload.
Where they worked
| Address in source | Most recent permit |
|---|---|
| 1547 NORTH ST | 2026-08-10 |
| 3735 EMERSON AVE | 2026-08-06 |
| 1303 ALPINE AVE 29B | 2026-07-13 |
| 836 WALNUT ST E | 2026-07-06 |
| 947 POPLAR PL | 2026-07-06 |
| 1700 KALMIA AVE | 2026-06-09 |
| 1318 YELLOW PINE AVE B | 2026-05-21 |
| 3105 FREMONT ST | 2026-04-29 |
| 1502 COLUMBINE AVE | 2026-04-17 |
| 351 W ARAPAHOE LN | 2026-04-10 |
| 1725 ZAMIA PL | 2026-04-09 |
| 2111 COLUMBINE AVE | 2026-03-12 |
| 3228 11TH ST | 2026-02-09 |
| 4848 CURIE CT | 2026-02-02 |
195 distinct addresses on record; the 14 most recent are shown. Declared value on record runs from $0 to $48,300, median $5,433. Addresses appear as the authority published them. A permit is a filing at an address, not a completed job there.
Permits on record
213 permits; open the 50 most recent
| Permit | Issued | Category | Address in source | Scope as filed | Declared value |
|---|---|---|---|---|---|
| MEC2026-01385 | 2026-08-10 | Mechanical / HVAC | 1547 NORTH ST | Replace Tanked water heater with 40 gal tanked water heater **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning ap | $6,159 |
| MEC2026-01357 | 2026-08-06 | Mechanical / HVAC | 3735 EMERSON AVE | Install new 16 SEER2, 2 ton heat pump system. Install new dedicated electrical circuit for heat pump **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All n | $13,000 |
| MEC2026-01124 | 2026-07-13 | Mechanical / HVAC | 1303 ALPINE AVE 29B | Replace existing a/c system with a new 2 ton, 16 SEER a/c system. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burn | $4,368 |
| MEC2026-01105 | 2026-07-06 | Mechanical / HVAC | 836 WALNUT ST E | Replace existing a/c system with a new 3 ton, 16 SEER a/c system **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burni | $9,523 |
| MEC2026-01099 | 2026-07-06 | Mechanical / HVAC | 947 POPLAR PL | Replace existing furnace with a new 97% AFUE, 80,000 btu/hr furnace. Replace existing a/c system with a new 15.2 SEER2, 3 ton heat pump system. **PLEASE NOTE: APPLICABLE ONLY TO | $11,540 |
| MEC2026-00923 | 2026-06-09 | Mechanical / HVAC | 1700 KALMIA AVE | replace tanked water heater with Electric 50 gal water heater **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning | $1,643 |
| MEC2026-00800 | 2026-05-21 | Mechanical / HVAC | 1318 YELLOW PINE AVE B | Replace existing a/c system with a new 2 ton, 16 SEER2 a/c system | $4,733 |
| MEC2026-00655 | 2026-04-29 | Mechanical / HVAC | 3105 FREMONT ST | Replace Boiler with New Boiler **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning appliances must undergo pressur | $7,000 |
| MEC2026-00593 | 2026-04-17 | Mechanical / HVAC | 1502 COLUMBINE AVE | Replace existing furnace with a new 96% AFUE, 60,000 btu/hr furnace. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel b | $4,646 |
| MEC2026-00536 | 2026-04-10 | Mechanical / HVAC | 351 W ARAPAHOE LN | Replace Furnace with 98% 120k BTU Furnace and Replace AC with 26 SEER, 5 Ton AC **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents | $13,837 |
| MEC2026-00538 | 2026-04-09 | Mechanical / HVAC | 1725 ZAMIA PL | Replace existing furnace with a new 96% AFUE, 60,000 btu/hr furnace. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel b | $3,122 |
| MEC2026-00355 | 2026-03-12 | Mechanical / HVAC | 2111 COLUMBINE AVE | Install 1.5 ton, 25 SEER multizone mini split heat pump with (2) high wall indoor units **Any electrical work required beyond a like-for-like replacement of equipment will require | $9,965 |
| MEC2026-00199 | 2026-02-09 | Mechanical / HVAC | 3228 11TH ST | replace existing water heater with 50 gal water heater **Any electrical work required beyond a like-for-like replacement of equipment will require an electrical permit for inspect | $1,775 |
| MEC2026-00176 | 2026-02-03 | Mechanical / HVAC | 3228 11TH ST | Replace existing furnace with a new 96% AFUE, 60,000 btu hr furnace. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel b | $5,433 |
| MEC2026-00168 | 2026-02-02 | Mechanical / HVAC | 4848 CURIE CT | Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace. Replace existing a/c system with a new 2.5 ton, 16 SEER a/c system. Replace existing tanked water heater with | $8,910 |
| MEC2026-00025 | 2026-01-12 | Mechanical / HVAC | 1097 ORANGE PL | Replace existing furnace with a new 98% AFUE, 60,000 btu/hr furnace. Install new 1.5 ton, 16 SEER a/c system. Replace existing tanked water heater with a new 40 gallon tanked wat | $10,110 |
| MEC2026-00024 | 2026-01-12 | Mechanical / HVAC | 3030 ONEAL PKWY 13R | Replace existing boiler with a new 84% AFUE, 60,000 btu/hr boiler **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burn | $7,806 |
| MEC2025-02304 | 2025-12-23 | Mechanical / HVAC | 2815 17TH ST | Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel b | $3,592 |
| MEC2025-02284 | 2025-12-19 | Mechanical / HVAC | 1028 ALBION WAY | ***VOID-180 Days no activity*** Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new | $3,592 |
| MEC2025-02249 | 2025-12-18 | Mechanical / HVAC | 1795 QUINCE AVE | Replace existing boiler with a new 95% AFUE, 200,000 btu/hr boiler **Any electrical work required beyond a like-for-like replacement of equipment will require an electrical permit | $4,266 |
| MEC2025-02241 | 2025-12-16 | Mechanical / HVAC | 290 32ND ST | Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel b | $4,628 |
| MEC2025-02190 | 2025-12-11 | Mechanical / HVAC | 5880 S ORCHARD CREEK CIR | Replace existing furnace with a new 98% AFUE, 60,000 btu/hr furnace. Install new Steam humidifier. **Any electrical work required beyond a like-for-like replacement of equipment | $7,656 |
| MEC2025-02177 | 2025-12-08 | Mechanical / HVAC | 963 LARAMIE BLVD E | All indoor changes, Replace existing furnace with a new 96% AFUE, 60,000 btu/hr furnace. Replace existing tanked water heater with a new 40 gallon tanked water heater. **Any elec | $5,433 |
| MEC2025-02143 | 2025-12-04 | Mechanical / HVAC | 4400 CHIPPEWA DR | Replace two tanked water heaters with one 50 gallon indirect water heater connected to existing boiler. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All | $3,138 |
| MEC2025-02026 | 2025-11-18 | Mechanical / HVAC | 2475 MAPLETON AVE | Replace existing furnace with a new 96% AFUE, 100,00 btu/hr furnace. Replace existing a/c system with a new 4 ton, 16 SEER a/c system. Replace existing tanked water heater with a | $11,573 |
| MEC2025-01828 | 2025-10-27 | Mechanical / HVAC | 2204 MAPLETON AVE | ***Voided for inactivity - no inspection within 180 days*** Replace existing furnace with a new 98% AFUE, 60,000 btu/hr furnace. **All new plastic glued vents for fuel burning app | $7,825 |
| MEC2025-01676 | 2025-10-09 | Mechanical / HVAC | 4207 MONROE DR A | Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace **All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the insp | $3,150 |
| MEC2025-01476 | 2025-09-18 | Mechanical / HVAC | 40 SOUTH BOULDER CIR 4013 | *Equipment is currently in an elevated position. Like for Like replacement to include it being elevated again* Replace existing furnace with a new 80% AFUE, 45,000 btu/hr furnace. | $4,248 |
| MEC2025-01432 | 2025-08-29 | Mechanical / HVAC | 1665 ZAMIA AVE | Replace existing furnace with a new 96% AFUE, 60,000 btu/hr furnace. Replace existing a/c system with a new 2 ton, 16 SEER a/c system. **All new plastic glued vents for fuel burn | $7,168 |
| MEC2025-01420 | 2025-08-28 | Mechanical / HVAC | 955 BROADWAY 201 | Replace existing air handler and 2.5 ton, 15 SEER condenser. **All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the inspection | $5,115 |
| MEC2025-01323 | 2025-08-28 | Mechanical / HVAC | 1470 OAK PL | Replace existing furnace with a new 96% AFUE, 80,000 btu/hr furnace. All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the inspec | $4,683 |
| MEC2025-01403 | 2025-08-26 | Mechanical / HVAC | 955 BROADWAY 304 | Replace existing air handler and 2.5 ton, 15 SEER condenser **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning ap | $5,115 |
| MEC2025-01402 | 2025-08-26 | Mechanical / HVAC | 955 BROADWAY 303 | Replace existing air handler and 2.5 ton, 15 SEER condenser **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning ap | $5,115 |
| MEC2025-01401 | 2025-08-26 | Mechanical / HVAC | 955 BROADWAY 206 | Replace existing air handler and 2.5 ton, 15 SEER condenser **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning ap | $5,115 |
| MEC2025-01400 | 2025-08-26 | Mechanical / HVAC | 955 BROADWAY 205 | Replace existing air handler and 2.5 ton, 15 SEER condenser **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning ap | $5,115 |
| MEC2025-01378 | 2025-08-21 | Mechanical / HVAC | 330 HOPI PL | Replace (2) existing furnaces with a new 80% AFUE 70,000 btu/hr furnace and a new 80% AFUE, 90,000 btu/hr furnace. Replace (2) existing a/c systems with a 2.5 ton, 16 SEER a/c sys | $7,083 |
| MEC2025-01375 | 2025-08-20 | Mechanical / HVAC | 1170 LEHIGH ST | Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace. Replace existing a/c system with a new 2 ton 16 SEER a/c system. **PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WI | $6,740 |
| MEC2025-01194 | 2025-07-28 | Mechanical / HVAC | 2104 MAPLETON AVE | Replace existing Air handler and a/c system with new Air handler and 3 ton, 16 SEER a/c system. | $10,080 |
| MEC2025-01178 | 2025-07-24 | Mechanical / HVAC | 55 BENTHAVEN PL | Mechanical permit for reinstatement of original permit #mec2022-01958 that expired. Kevin Muller said we would not need to pay taxes again and permit would cost $293.65.. Replace | $8,050 |
| MEC2025-01155 | 2025-07-22 | Mechanical / HVAC | 91 PIMA CT | Will need to pull electrical and mechanical permit since new electrical circuit. "Replace existing furnace with a new 96% AFUE, 80,000 btu/hr furnace. Install new 3 ton, 16 SEER | $9,945 |
| MEC2025-00984 | 2025-06-23 | Mechanical / HVAC | 55 BENTHAVEN PL | Replace existing a/c system with new 16 SEER, 2 ton a/c system. | $5,345 |
| MEC2025-00971 | 2025-06-20 | Mechanical / HVAC | 84 PIMA CT | Replace existing a/c system with a new 16 SEER, 2.5 ton a/c system. | $5,623 |
| MEC2025-00882 | 2025-06-06 | Mechanical / HVAC | 4655 7TH ST | 2- 50 gal water heaters with drains pans and expansion tanks as well. | $2,812 |
| MEC2025-00821 | 2025-05-29 | Mechanical / HVAC | 4171 COOPER CT | Replace existing a/c system with a new 3 ton, 17 SEER a/c system. | $7,052 |
| MEC2025-00661 | 2025-04-28 | Mechanical / HVAC | 4524 14TH ST 7F | Replace existing boiler with a new 199,000 btu/hr, 95% AFUE boiler. | $8,780 |
| MEC2025-00632 | 2025-04-22 | Mechanical / HVAC | 650 EMPORIA RD | VOID- Over 180 Days No Activity Replace existing furnace with a new 80% AFUE, 70,000 btu/hr furnace. Replace existing a/c system with anew 2.5 ton, 16 SEER a/c system. | $7,146 |
| MEC2025-00582 | 2025-04-17 | Mechanical / HVAC | 5000 BUTTE ST 303 | VOID- Over 180 Days No Activity Install new 1.5 ton, 14 SEER a/c system. *Replacement | $3,800 |
| MEC2025-00580 | 2025-04-17 | Mechanical / HVAC | 5000 BUTTE ST 304 | VOID- Over 180 Days No Activity Install new 1.5 ton, 14 SEER a/c system. *Replacement | $3,800 |
| MEC2025-00531 | 2025-04-04 | Mechanical / HVAC | 2323 4TH ST | Install new replacement 25 SEER, 1 ton mini split heat pump, with 1 high wall indoor unit. | $5,275 |
| MEC2025-00494 | 2025-04-01 | Mechanical / HVAC | 3153 9TH ST | Replace existing furnace with a new 96% AFUE, 60,000 btu/hr furnace. Replace existing a/c system with a new 2.5 ton, 16 SEER a/c system. | $9,887 |
Fields appear as the issuing authority published them, including spelling and blanks. Scope text is the applicant's description of intended work, not an inspection finding.
Source and limits
Public Boulder permit records through 2026, counted by distinct permit number. This is a historical filing record: it cannot show current backlog, pricing, crew availability, licensing or insurance, and a quiet period may only mean work was filed elsewhere. Confirm anything commercial with the company and with the issuing authority before acting. How we build these records, and what we withhold →