# Building permits at 4321 Mainfield Ave, Baltimore, MD Two permits on record here. The newest, Sep 9, 2025: Direct replacement of 2 Ton Heat Pump & Air Handler with new Lennox 2 Ton heat pump (M:ML14KP1-024) & 2.5 Ton. Within a quarter mile, the city has issued 10 more permits (9 projects) since May 1. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Sep 9, 2025 | Mechanical (HVAC) | Direct replacement of 2 Ton Heat Pump & Air Handler with new Lennox 2 Ton heat pump (M:ML14KP1-024) & 2.5 Ton Air Handler (M:CBK45UHET-030) | $13,144 | [BRCM-25-014834](https://nearbypermits.com/baltimore/permit/BRCM-25-014834/) | | Sep 3, 2025 | Mechanical (HVAC) | Direct replacement of 2 Ton Heat Pump & 2.5 Ton Air Handler with new Lennox 2 Ton heat pump (M:ML14KP1-024) & 2.5 Ton Air Handler (M:CBK45UHET-030) | $13,144 | [BRCM-25-014724](https://nearbypermits.com/baltimore/permit/BRCM-25-014724/) | ## Within ¼ mi since May 1, 2026 10 permits in the circle. From our copy of the city's data (last 24 months). ### This block (250 to 1,000 ft), 9 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 23, 2026 | [2707 Montebello Ter](https://nearbypermits.com/baltimore/address/2707-montebello-ter/) | 410 ft SE | Alteration or repair | Replace exterior door thru the home depot - same size, $500 - spearman, adrian k h: | $500 | [BRCM-26-019440](https://nearbypermits.com/baltimore/permit/BRCM-26-019440/) | | Aug 25, 2026 | [4502 Weitzel Ave](https://nearbypermits.com/baltimore/address/4502-weitzel-ave/) | 590 ft E | Plumbing | Replace existing water service with new 3/4 black poly | $1,800 | [BRCM-26-017400](https://nearbypermits.com/baltimore/permit/BRCM-26-017400/) | | Aug 3, 2026 | [4518 Mainfield Ave](https://nearbypermits.com/baltimore/address/4518-mainfield-ave/) | 920 ft E | Other | | Not listed | [BDEM-26-000058](https://nearbypermits.com/baltimore/permit/BDEM-26-000058/) | | Jul 2, 2026 | [4518 Mainfield Ave](https://nearbypermits.com/baltimore/address/4518-mainfield-ave/) | 920 ft E | Other | | $5,500 | [BRCM-26-013719](https://nearbypermits.com/baltimore/permit/BRCM-26-013719/) | | Jul 24, 2026 | [4502 Weitzel Ave](https://nearbypermits.com/baltimore/address/4502-weitzel-ave/) | 590 ft E | Electrical | 100A to 200A service upgrade | $1,500 | [BRCM-26-015172](https://nearbypermits.com/baltimore/permit/BRCM-26-015172/) | | Jul 23, 2026 | [4518 Mainfield Ave](https://nearbypermits.com/baltimore/address/4518-mainfield-ave/) | 920 ft E | Plumbing | Plumbing work: cap off water and sewer as per code | $4,000 | [BRCM-26-015045](https://nearbypermits.com/baltimore/permit/BRCM-26-015045/) | | Jun 3, 2026 | [4514 Mainfield Ave](https://nearbypermits.com/baltimore/address/4514-mainfield-ave/) | 820 ft NE | Plumbing | Repair water service in kind. All work subject to field inspections as per code. | $1,500 | [BRCM-26-011569](https://nearbypermits.com/baltimore/permit/BRCM-26-011569/) | | Jun 1, 2026 | [4518 Weitzel Ave](https://nearbypermits.com/baltimore/address/4518-weitzel-ave/) | 950 ft E | Other | | $2,000 | [BRCM-26-006636](https://nearbypermits.com/baltimore/permit/BRCM-26-006636/) | | May 4, 2026 | [2711 Woodsdale Ave](https://nearbypermits.com/baltimore/address/2711-woodsdale-ave/) | 610 ft SW | Other | replace heal 90, toilet flange and eliminate regeneration line as per inspector | $2,800 | [BRCM-26-009337](https://nearbypermits.com/baltimore/permit/BRCM-26-009337/) | ### Farther (1,000 ft to ¼ mi), 1 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 28, 2026 | [2819 Overland Ave](https://nearbypermits.com/baltimore/address/2819-overland-ave/) | 0.24 mi SE | Electrical | Sibling permit BRCM-25-021758. Replace damaged 150Amps service cable. | $1,500 | [BRCM-26-019769](https://nearbypermits.com/baltimore/permit/BRCM-26-019769/) | ## Zoning requests nearby We don't list zoning cases for Baltimore yet. Look them up on the city's Baltimore Municipal Zoning and Appeals Board page: https://www.baltimorecity.gov/mayor/our-work/boards-commissions/boards/baltimore-municipal-zoning-and-appeals-board-bmza ## More on this street Other addresses on Mainfield Ave with permits, nearest house number first: - [4514 Mainfield Ave](https://nearbypermits.com/baltimore/address/4514-mainfield-ave/): newest permit Jun 3, 2026 - [4518 Mainfield Ave](https://nearbypermits.com/baltimore/address/4518-mainfield-ave/): newest permit Aug 3, 2026 - [4605 Mainfield Ave](https://nearbypermits.com/baltimore/address/4605-mainfield-ave/): newest permit Mar 9, 2026 --- Source: Baltimore Department of Housing and Community Development permit data (https://www.arcgis.com/home/item.html?id=189e6d1c65df4e13b38c0027cee574f6), City of Baltimore, CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/). Checked 2026-10-16 19:45 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Map, both permits at this address and 10 nearby: https://nearbypermits.com/baltimore/address/4321-mainfield-ave/