Building permits, zoning and land rules in Harford County, Maryland

Yes. Unincorporated Harford County generally requires a building permit to construct, alter, move, demolish or place a structure, install regulated equipment or change a structure's use; the county's incorporated municipalities issue permits under their own requirements¹. The county enforces the adopted 2021 building, residential, energy, and swimming-pool and spa codes with local amendments⁸. Permitted work must remain uncovered until inspection and approval, and covered commercial and residential projects need a final Use and Occupancy Certificate before occupancy⁹. State law generally excludes a building on premises devoted solely to agricultural use from the cited county building code, but that narrow exception does not erase zoning, septic or floodplain approvals¹⁰. Once approved, construction must begin within 12 months, and a permit is declared invalid if work stalls for six months after start-up¹.

Harford County's building department is the Department of Inspections, Licenses and Permits at 220 S Main Street, Bel Air, MD 21014; the Permit Center phone is 410-638-3122¹¹. DILP strongly encourages online submissions through the ePermit Center, while applications may also be delivered through the lobby drop box or by email with the required documents¹². The published fee schedule charges residential new construction, additions and alterations at $0.15 per square foot plus a $100 non-refundable application fee¹³. Zoning Administration reviews applications for zoning compliance and can be reached at 410-638-3103⁵. Keep the permit number handy for inspections, leave work uncovered until approval, and complete final inspections before requesting the Use and Occupancy Certificate⁹.

Harford County zoning applies in unincorporated areas, while incorporated municipalities have municipality-specific zoning regimes¹⁴. Official county zoning maps designate the classification of land governed by the county code, so ask Zoning Administration to confirm the parcel's district, allowed use and setbacks before designing^2,5. Requirements vary by district and use: the B3 table, for example, shows a 7,500-square-foot minimum lot and 60-foot width for its single-family-detached row². Lots in the Chesapeake Bay Critical Area's Limited Development Area generally have a 15% lot-coverage limit, subject to parcel-history exceptions and mitigation provisions². Rural Residential (RR) land is stated at a density of 1 dwelling unit per 2 acres, and the AG, RR, R1, RO and VR districts each have a design table setting lot area, setbacks and height by use¹⁴. A mobile-home park must cover at least 10 acres in an R3 or R4 district with structures at least 50 feet from project lines, and a mobile-home subdivision needs at least 5 acres². A mobile-home park requires Board approval, while an individual mobile home may require a special exception in a listed district².

The Harford County Health Department is the local permitting and inspection authority for residential on-site sewage systems on existing lots³. A new home using septic needs a satisfactory percolation test and site evaluation before the sanitary construction permit application³. The Health Department must inspect the installed system before its components are backfilled or covered³. A permit is required for any new well, and the residential process requires a Maryland-licensed well driller to apply with an acceptable site plan before the building permit is released⁴. Only about 18.8% of county soils lack severe limits for a conventional drain field, so septic feasibility can control the usable building area¹⁵. The county fee schedule lists $210 for new sanitary construction and $190 for new sanitary disposal¹⁶.

In Harford County agricultural and residential districts, living or sleeping in an RV, camper or trailer as an accessory use is limited to 7 calendar days within any 90-day period unless the location is approved for that use². The vehicle must be stored in the rear yard, or in a properly buffered side yard that maintains the principal-use side-yard setback². An RV park is a separate AG-district use, while a mobile-home park is limited to R3 or R4, must occupy at least 10 acres and requires Board approval². We could not confirm how Harford County classifies a proposed tiny home, so ask Zoning Administration whether the design qualifies as a dwelling, mobile home or another use⁵.

1. Ask Zoning Administration to confirm the district, use and site constraints for the parcel⁵.

1. Determine whether public water and sewer are available; a public connection starts with an application to the Division of Water & Sewer, followed after approval by a licensed plumber's connection-permit application¹⁷.

1. For a private system on an existing lot, complete the soil evaluation and obtain septic and well approvals through the Health Department^3,4.

1. Submit the building application and plans to DILP through a published submission route¹².

1. Obtain a driveway access permit for access from a county road, and coordinate separately with MDOT SHA if work enters state right-of-way^7,18.

1. Schedule each required inspection before covering work, secure approval at final inspection and obtain the final Use and Occupancy Certificate before moving in⁹.

Check septic feasibility early because only about 18.8% of Harford County soils lack severe limits for a conventional drain field¹⁵. Confirm whether the parcel uses public utilities or needs a private well and septic system; public connection availability is property-specific^3,17. Development wholly or partly within, or touching, a county flood-hazard area needs a Harford County permit before work begins; filling, grading, structures and manufactured-home placement are among the covered activities, and work must start within 180 days of issuance¹⁹. Confirm the zoning map, Chesapeake Bay Critical Area overlay, subdivision history and county-road access before closing^2,7,20. The effective property-tax rate is about 0.9%, with a median annual bill near $3,424¹⁵.