On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for Catonsville, Baltimore County
County permit rules cover additions, alterations, structural modifications, demolitions, change in use, floodplain work, major roof deck/sheathing replacement, commercial siding, historic-district/landmark siding work, and larger or specially located accessory structures.
Detached one-story accessory structures and similar uses not over 120 square feet outside floodplain, critical area, and county historic/landmark constraints
Very low deck work within the county's deck-height exemption
Flag poles and bases
Retaining walls under 3 feet
Certain sidewalks and driveways
Finish work such as painting, papering, tiling, carpeting, cabinets, and countertops
Small prefabricated pools under the county thresholds
Swings and playground equipment accessory to detached one- and two-family dwellings
Qualifying nonstructural alterations that do not involve kitchens or basement sleeping areas
Replacement of existing deck boards/nailers without changing deck size
Two layers of shingles on a roof, as specifically noted on the county roofing page
- Exempt Detached one-story accessory structures and similar uses not over 120 square feet outside floodplain, critical area, and county historic/landmark constraints
- Exempt Very low deck work within the county's deck-height exemption
- Exempt Flag poles and bases
- Exempt Retaining walls under 3 feet
- Exempt Certain sidewalks and driveways
- Exempt Finish work such as painting, papering, tiling, carpeting, cabinets, and countertops
- Exempt Small prefabricated pools under the county thresholds
- Exempt Swings and playground equipment accessory to detached one- and two-family dwellings
- Exempt Qualifying nonstructural alterations that do not involve kitchens or basement sleeping areas
- Exempt Replacement of existing deck boards/nailers without changing deck size
- Exempt Two layers of shingles on a roof, as specifically noted on the county roofing page
Note: Exempt from building permit does not mean exempt from zoning and planning requirements. Confirm edge cases with the Building Inspection Division before proceeding.
Required documents
- Site plan
- Construction plans
- Signed/sealed plans where required by scope
- Well/septic groundwater-compliant site plans if applicable
- Permit-specific county forms
- Building code
- Bill 49-24 effective September 3, 2024; 2021 IBC, IRC, IMC, IECC, and ISPSC with county amendments, plus latest NEC under county code and updated plumbing/gasfitting and floodplain provisions.
- Permit validity
- One year by default, with up to one additional year by extension, or a two-year permit option in some cases. Permits also lapse for noncommencement within six months or suspension/abandonment for six months.
- Owner-builder
- County owner-builder guidance is posted through the Affirmation of Landowner form for landowners building directly on their own property for their own use.
- Contractor requirements
- Licensed electricians and plumbers must obtain those trade permits; residential alteration/addition work by a private contractor requires a Maryland Home Improvement License number; county code also requires licensed supervision for trade and building-contractor work.
Source: Baltimore County Department of Permits, Approvals and Inspections, Permit Processing ↗
§ 03
Application process
Typical processing: No countywide building permit processing-time estimate was posted on the general application and permit-processing pages.
- 01 Open or log into a Baltimore County PLL Portal account.
- 02 Choose the relevant permit type and enter owner, applicant, address, and contractor details.
- 03 Upload required plans, site documents, and permit-specific forms, then submit the application.
- 04 Permit Processing and related county reviewers examine the package and issue comments if revisions are needed.
- 05 Applicant retrieves comments in the portal, revises documents, and resubmits.
- 06 Applicant pays fees online after the county posts them to the application.
- 07 Baltimore County issues the permit electronically after approvals and payment; inspections are then scheduled through the same portal.
Typical processing time: No countywide building permit processing-time estimate was posted on the general application and permit-processing pages.
Source: Baltimore County Department of Permits, Approvals and Inspections, Permit Processing ↗
§ 04
Fee schedule
Effective 2026-03
Fee type
Amount
01
Minimum permit fee
No single minimum applies to every county permit; the building fee schedule shows several category minimums
02
Plan check fee
Generally $85 to $130 for listed residential plan-review items, with preliminary review at $54 per half hour
03
Permit fee formula
Square-foot and occupancy-based for many building permits, plus flat-fee and unit-based charges for many other permit classes
04
Penalty (no permit)
Investigation fee may be charged when work starts without a permit; revision and ownership-change fees are posted
Pay online by credit card or PayPal; county FAQ specifically lists Mastercard, Visa, and PayPal
Fees change periodically. Confirm at the official fee schedule ↗ (effective 2026-03) before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- PLL Portal (online)
- 410-887-3953 (estimated times: 7:30–8:00 AM) (phone)
- Scheduling deadline
- Requests must be submitted by 2 p.m. the prior business day; estimate by morning phone call; same-day cancel/reschedule after the 6 a.m. deadline by phone.
- Inspection hours
- Monday through Friday, 7:30 a.m. to 3:30 p.m.
Typical sequence: Countywide public guidance does not publish a single universal sequence, but typical building projects move through foundation/footing, framing and trade rough-in inspections, then final approval as applicable.
Source: Baltimore County Department of Permits, Approvals and Inspections, Permit Processing ↗
§ 06
Frequently asked
Common questions about Catonsville, Baltimore County permits
01 Do I need a building permit in Catonsville, Baltimore County, MD? ▸
County permit rules cover additions, alterations, structural modifications, demolitions, change in use, floodplain work, major roof deck/sheathing replacement, commercial siding, historic-district/landmark siding work, and larger or specially located accessory structures.
02 How much does a building permit cost in Catonsville, Baltimore County, MD? ▸
Building permit fees in Catonsville, Baltimore County, MD are set by the local building department and vary by project type and valuation. The minimum permit fee is No single minimum applies to every county permit; the building fee schedule shows several category minimums. Fees are calculated as: Square-foot and occupancy-based for many building permits, plus flat-fee and unit-based charges for many other permit classes. Plan check fee: Generally $85 to $130 for listed residential plan-review items, with preliminary review at $54 per half hour.
03 How do I apply for a building permit in Catonsville, Baltimore County, MD? ▸
To apply for a building permit in Catonsville, Baltimore County, MD, follow these steps: 1. Open or log into a Baltimore County PLL Portal account. 2. Choose the relevant permit type and enter owner, applicant, address, and contractor details. 3. Upload required plans, site documents, and permit-specific forms, then submit the application. 4. Permit Processing and related county reviewers examine the package and issue comments if revisions are needed. 5. Applicant retrieves comments in the portal, revises documents, and resubmits. 6. Applicant pays fees online after the county posts them to the application. 7. Baltimore County issues the permit electronically after approvals and payment; inspections are then scheduled through the same portal.
04 How long does it take to get a building permit in Catonsville, Baltimore County, MD? ▸
Building permit processing times in Catonsville, Baltimore County, MD typically run No countywide building permit processing-time estimate was posted on the general application and permit-processing pages.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in Catonsville, Baltimore County, MD? ▸
Not all construction work requires a permit in Catonsville, Baltimore County, MD. The following work is generally exempt: Detached one-story accessory structures and similar uses not over 120 square feet outside floodplain, critical area, and county historic/landmark constraints; Very low deck work within the county's deck-height exemption; Flag poles and bases; Retaining walls under 3 feet; Certain sidewalks and driveways; Finish work such as painting, papering, tiling, carpeting, cabinets, and countertops; Small prefabricated pools under the county thresholds; Swings and playground equipment accessory to detached one- and two-family dwellings; Qualifying nonstructural alterations that do not involve kitchens or basement sleeping areas; Replacement of existing deck boards/nailers without changing deck size; Two layers of shingles on a roof, as specifically noted on the county roofing page. Note: Exempt from building permit does not mean exempt from zoning and planning requirements. Confirm edge cases with the Building Inspection Division before proceeding. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in Catonsville, Baltimore County, MD? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in Catonsville, Baltimore County, MD via: PLL Portal, 410-887-3953 (estimated times: 7:30–8:00 AM). Requests must be submitted by 2 p.m. the prior business day; estimate by morning phone call; same-day cancel/reschedule after the 6 a.m. deadline by phone..
last verified April 2026
source Baltimore County Department of Permits, Approvals and Inspections, Permit Processing ↗
entry id permits/maryland/baltimore-county/catonsville
Educational reference. Permit rules and fees change — confirm current requirements directly with Baltimore County Department of Permits, Approvals and Inspections, Permit Processing before applying. Jaspector is not legal advice.