MAMMOTH UNDERGROUND LLC
MAMMOTH UNDERGROUND LLC has filed 52 building permits in Henderson since 2017, closing 80% of 25 rated permits. 26 permits remain open. Primarily files commercial permits. 10.0 points below the city median of 90.0%. Busiest year: 2026 with 21 permits.
80%
46
Construction Permits
52 total
26
Currently Open
25
Rate-Eligible
permits > 1yr old
2017–2026
Years Active
Closure rate based on permits older than 1 year. "Issued" and "Stop Work" statuses are excluded.
Project Financials
$1K
Total Declared Value
$78.7
Avg per Permit
$81.6
Largest Project
Based on 14 of 46 construction permits with declared valuation data.
Performance by Permit Type
Commercial11 rated
72.7% closed vs 94% median, 20.9 points lower
Structural11 rated
100.0% closed vs 78% median, 22.4 points higher
Residential3 rated
33.3% closed vs 88% median, 54.2 points lower
Median based on all applicants with 20+ rated permits in each category. Only permits older than 1 year are rated.
Year-by-Year Summary
2026(YTD)
—
Open21
Closed0
Too early to rate — permits need 1 year to mature
2022
70.0%
Open3
Closed7
7 closed / 10 rated
2021
100.0%
Open0
Closed1
1 closed / 1 rated
2020
80.0%
Open1
Closed4
4 closed / 5 rated
2019
66.7%
Open1
Closed2
2 closed / 3 rated
2018
100.0%
Open0
Closed4
4 closed / 4 rated
2017
100.0%
Open0
Closed2
2 closed / 2 rated
All Permits
52 permits
| Status | Permit # | Address | Issued▼ | |||
|---|---|---|---|---|---|---|
| Open | BLDG - Commercial MP&E | , Henderson | Apr 8, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Apr 8, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 25, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 25, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 23, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 23, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 23, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 23, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 18, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 18, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 18, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 5, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 3, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 3, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Mar 1, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 11, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 10, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 10, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 10, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 10, 2026<1yr | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Feb 10, 2026<1yr | — | — | |
| Open | PW - Barricade Permit | , Henderson | Aug 31, 2023 | — | — | |
| Open | PW - Barricade Permit | , Henderson | Jul 13, 2023 | — | — | |
| Open | PW - Barricade Permit | , Henderson | May 25, 2023 | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Nov 6, 2022 | — | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Oct 30, 2022 | Jun 16, 2023 | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Oct 9, 2022 | Feb 13, 2023 | — | |
| Open | PW - Barricade Permit | 1640 PALOMINO DR, Henderson | Sep 30, 2022 | — | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Sep 16, 2022 | Nov 14, 2022 | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Sep 16, 2022 | Dec 5, 2022 | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Aug 22, 2022 | Dec 5, 2022 | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Aug 18, 2022 | Nov 18, 2022 | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Aug 18, 2022 | Nov 29, 2022 | — | |
| Open | BLDG - Commercial MP&E | , Henderson | Jun 6, 2022 | — | — | |
| Open | BLDG - Commercial MP&E | , Henderson | May 24, 2022 | — | — | |
| Open | PW - Barricade Permit | 1640 PALOMINO DR, Henderson | Apr 22, 2022 | — | — | |
| Open | PW - Barricade Permit | , Henderson | Apr 19, 2022 | — | — | |
| Closed | BLDG - Commercial MP&E | , Henderson | Nov 10, 2021 | Aug 31, 2022 | — | |
| Closed | BLDG - Non-Building Structure | , Henderson | May 11, 2020 | Jul 30, 2020 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | May 11, 2020 | Aug 5, 2020 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Feb 6, 2020 | Feb 20, 2020 | $81.6 | |
| Closed | BLDG - Dwelling | 32 LAKE OASIS ST, Henderson | Jan 13, 2020 | Feb 7, 2020 | $71.45 | |
| Open | BLDG - Dwelling | 52 DESERT JUNIPER LN, Henderson | Jan 13, 2020 | — | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Oct 21, 2019 | Feb 20, 2020 | $81.6 | |
| Open | BLDG - Dwelling | 74 ASTER BEACH AVE, Henderson | Oct 21, 2019 | — | $71.45 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Oct 21, 2019 | Feb 20, 2020 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Jul 11, 2018 | Nov 1, 2018 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Mar 8, 2018 | Mar 11, 2019 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Mar 8, 2018 | Mar 15, 2018 | $81.6 | |
| Closed | BLDG - Non-Building Structure | , Henderson | Jan 29, 2018 | Feb 6, 2018 | $81.6 |
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