Deck Permit in Baltimore County, Maryland
It depends
Sometimes, depending on the project
Before building a deck that exceeds 120 square feet or that stands more than 16 inches above the lowest grade, and before any deck in a historic district, on the Landmarks List, in the floodplain, or in the Chesapeake Bay Critical Area.
By Mario Bailey, verified against official sources
Quick answer
Baltimore County requires a building permit for a deck on either of two independent triggers: more than 16 inches above the lowest grade, or more than 120 square feet. A low ground-level deck of 120 square feet or less needs no permit unless it is in a historic district, on the Landmarks List, in the floodplain, or in the Chesapeake Bay Critical Area. Construction plans are required at 600 square feet and over, and plans signed and sealed by a Maryland licensed design professional above 3,000 square feet.
Typical threshold: deck floor area, with a permit also required for any deck more than 16 inches above the lowest grade.
Who is pulling this permit?
Apply yourself
Hire it out
Before you sign, ask the contractor:
- Who pulls the permit, you or me, and is the permit fee included in the bid?
- Which inspections will this job need, and who meets the inspector on site?
- Is your contractor license active in this locality, and under which business name?
When a permit is usually needed
Before building a deck that exceeds 120 square feet or that stands more than 16 inches above the lowest grade, and before any deck in a historic district, on the Landmarks List, in the floodplain, or in the Chesapeake Bay Critical Area.
What your deck permit must meet in Maryland
Maryland requires every local jurisdiction to enforce the same residential code edition statewide, currently the 2021 IRC. The state's own amendments touch only scope, administration, and energy provisions, not the deck-framing chapter, so decks are built to the unmodified national model code as the statewide baseline.
- The statewide baseline is the model code itself: the 2021 International Residential Code is incorporated by reference in the Maryland Building Performance Standards (COMAR 09.12.51.04).
- Maryland's amendments to the IRC cover only Chapter 1 (Scope and Administration) and the Chapter 11 energy-efficiency provisions; no structural chapter, including the deck-framing provisions, is modified, so deck construction follows the published 2021 IRC text (COMAR 09.12.51.04).
Based on 2021 IRC, adopted via COMAR 09.12.51 Maryland Building Performance Standards. Read the code. Local amendments can be stricter; confirm the current requirement with your office before you build.
What a deck permit costs in Baltimore County
How Baltimore County compares in Maryland
No Maryland jurisdiction we have verified sets a size threshold for this permit, so what actually differs between them is the fee.
| Jurisdiction | Permit needed? | Typical fee |
|---|---|---|
| Baltimore Countythis page | It depends | Building Permit Fee Schedule effective 07/01/26: Decks (Open Deck) (under 600... |
| Howard County | Permit required | $50 per structure (Miscellaneous Structures Accessory permit, FY2027 Building... |
| Montgomery County | Permit required | $223.87 flat for an open unenclosed deck 500 sq ft or less, or $0.8830 per sq... |
| Prince George's County | Permit required | DPIE Fee Schedule, effective March 2, 2025, line item "Deck or Pergola"... |
Closest deck permit thresholds outside Maryland
Jurisdictions we cover whose limit sits nearest Baltimore County's 120 sq ft.
- Manatee County, Florida, All attached decks require a building permit regardless of size. A detached deck requires a permit if it is over 30 inches high or over 120 square feet; a detached deck under 30 inches high and under 120 square feet does not require a permit.
- San Bernardino County, California, floor area of a detached residential accessory structure
- Leon County, Florida, Decks greater than 100 square feet in area, or more than 30 inches above grade on any side, require a building permit (either condition alone triggers it).
- Austin, Texas, uncovered decks with area no greater than 200 sq ft and no more than 30 inches above grade and not attached to the dwelling and not providing required egress and not in floodplain are exempt
How to apply in Baltimore County
A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs.
What most deck permit applications include:
- A permit application identifying the work, the deck's size (square footage), and whether electrical work such as lights or receptacles is included, submitted for plan review before construction begins (IRC R106).
- A scaled site plan (for example 1/4 inch to 1 foot) showing the new deck's location relative to the house, its overall length and width, and dimensioned distances from the deck to all property lines and other structures so required setbacks can be verified (IRC R106.1.1).
- A deck plan drawn to scale showing overall dimensions and the framing layout: joist size, spacing, span, and species; beam size and span; post size and height; and footing or pier size and depth (IRC R507.4 posts, R507.5 beams, R507.6 joists, R507.3 footings).
- A section or side elevation with connection details showing the ledger attachment to the house band joist with flashing, the fastener or bolt schedule, joist hangers, post-to-beam and post-to-footing connections, and the required lateral load connection (IRC R507.9 ledger connection, R507.9.2 lateral connection, R507.2.4 flashing).
- Footing sizing derived from tributary area, the soil bearing value, and design loads per IRC Table R507.3.1, with footings shown bearing on undisturbed soil at the frost depth required by the jurisdiction (IRC R507.3).
- Details for the guards required where the walking surface is more than 30 inches above grade, and for the stairs and handrails, showing guard height and opening limits, stair riser and tread dimensions, and handrail location (IRC R312 guards, R311.7 stairs and handrails).
- For designs that fall outside the prescriptive R507 tables (for example multi-story or stacked decks, or a ledger attached to a cantilever), engineered and stamped structural plans are submitted in place of the prescriptive details (IRC R507.1 and R301).
General submittal guidance from IRC R106.1.1 (construction documents) and IRC R507 (exterior decks), 2021 IRC. Source. Baltimore County Department of Permits, Approvals and Inspections (PAI) sets the exact checklist for Baltimore County.
Where to apply in Baltimore County:
Baltimore County Department of Permits, Approvals and Inspections (PAI)
- County Office Building, 111 West Chesapeake Avenue, Towson, Maryland 21204
- Phone: 410-887-3900
Inspections and closing out your permit
Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
- Footing or pier inspection: after the holes are dug and any forms or reinforcing are set but before concrete is placed, the inspector checks footing depth and diameter, a flat undisturbed bearing surface, and that the holes are free of water (IRC R109.1.1 foundation inspection; R507.3 footings).
- Framing inspection: after the deck is framed but before the decking conceals it, the inspector verifies the ledger attachment and its flashing, the fastener and bolt schedule, joist hangers and metal connectors, post-to-beam and post-to-footing connections, and the lateral load connection; call it before decking is installed (IRC R109.1.4 frame inspection; R507.9 ledger and flashing).
- Final inspection: after the deck is complete and before it is used, the inspector confirms guard height and opening limits (a 4 inch sphere must not pass, 4 3/8 inch at stairs), stair riser and tread dimensions, handrail height and graspability where there are 4 or more risers, stair landings, and required stair lighting (IRC R109.1.6 final inspection; R312 guards, R311.7 stairs and handrails).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Baltimore County permit portal or by phone at 410-887-3900.
Inspection sequence from IRC R109 (inspections: R109.1.1 footing before concrete, R109.1.4 frame, R109.1.6 final), 2021 IRC. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Deck Permit checklist for Baltimore County
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: deck floor area, with a permit also required for any deck more than 16 inches above the lowest grade. Usually needed: Before building a deck that exceeds 120 square feet or that stands more than 16 inches above the lowest grade, and before any deck in a historic district, on the Landmarks List, in the floodplain, or in the Chesapeake Bay Critical Area.
- Budget the fee. Building Permit Fee Schedule effective 07/01/26: Decks (Open Deck) (under 600 sf) $105.00; Decks with Roof (under 600 sf) $105 + $20 occupancy fee; Decks (Open Deck) (600 sf and over) $150.00; Decks with Roof (600 sf and over) $150 + $20 occupancy fee. The $75.00 residential permit application fee is charged in addition. Official fee schedule.
- Apply. A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs. Start at the Baltimore County permit portal.
- Keep the office details handy. Baltimore County Department of Permits, Approvals and Inspections (PAI). Phone: 410-887-3900. Address: County Office Building, 111 West Chesapeake Avenue, Towson, Maryland 21204.
- Plan for inspections. Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need a deck permit in Baltimore County?
- Baltimore County requires a building permit for a deck on either of two independent triggers: more than 16 inches above the lowest grade, or more than 120 square feet. A low ground-level deck of 120 square feet or less needs no permit unless it is in a historic district, on the Landmarks List, in the floodplain, or in the Chesapeake Bay Critical Area. Construction plans are required at 600 square feet and over, and plans signed and sealed by a Maryland licensed design professional above 3,000 square feet. Deck floor area, with a permit also required for any deck more than 16 inches above the lowest grade. Always confirm with the office before starting.
- How much does a deck permit cost in Baltimore County?
- Building Permit Fee Schedule effective 07/01/26: Decks (Open Deck) (under 600 sf) $105.00; Decks with Roof (under 600 sf) $105 + $20 occupancy fee; Decks (Open Deck) (600 sf and over) $150.00; Decks with Roof (600 sf and over) $150 + $20 occupancy fee. The $75.00 residential permit application fee is charged in addition. See the official fee schedule for current amounts.
- Where do you apply for a deck permit in Baltimore County?
- You can apply through the Baltimore County permit portal or contact the Baltimore County Department of Permits, Approvals and Inspections (PAI) directly. The links are listed on this page.
- Can a homeowner pull a deck permit themselves in Baltimore County?
- Under Maryland law (Md. Code, Bus. Occ. and Prof. 12-301(b), 6-607(1); Public Safety 12-505): It depends on the trade and the county. Plumbing: state law exempts an individual who personally provides plumbing services in their own residence, but homeowners may not make final connections between the residence and public or private water supply or disposal systems, and Baltimore County plus the WSSC-area counties are largely carved out of the state plumbing title. Electrical: the Maryland Electricians Act prohibits providing electrical services for compensation without a license; it has no express homeowner exemption, so uncompensated work on one's own home falls outside the licensing prohibition, but each county decides whether it will issue an electrical permit to an unlicensed homeowner. Building permits are issued by local jurisdictions, which set their own owner-applicant rules. Confirm how Baltimore County applies this before you apply.
From the Library
What else needs a permit in Baltimore County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Electrical Permit | It depends | Not specified | Electrical Permit Fee Schedule effective 11/26/18: Residential Service (each meter)... |
| Fence Permit | It depends | fence height measured vertical to ground, including a fence set on top of a wall | Building Permit Fee Schedule effective 07/01/26 lists Fences, Residential: $35.00 +... |
| HVAC Permit | It depends | Not specified | The Building Permit Fee Schedule effective 07/01/26 prices Mechanical, HVAC System Only... |
| Plumbing Permit | Permit required | Not specified | Plumbing Inspection Fee Schedule effective 11/26/18: Inspection, New, for 1st fixture... |
| Pool Permit | It depends | above-ground pool surface area, where the water depth is 24 inches or more; in-ground pools require a permit at any size | Building Permit Fee Schedule effective 07/01/26: Swimming Pool, Residential, Above... |
| Roof Replacement Permit | It depends | share of the sheathing or deck being replaced in a roofing job | The Building Permit Fee Schedule effective 07/01/26 publishes no roofing line item. |
| Shed Permit | It depends | accessory structure floor area | Building Permit Fee Schedule effective 07/01/26: Accessory Structure, Under 1000 sf... |
| Solar Permit | Permit required | Not specified | Building Permit Fee Schedule effective 07/01/26: Solar Power System, Residential (Roof... |
Deck Permit in other Maryland localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Baltimore County documents; the office above sets the local rules.
Verified by a person against the sources above on , not confirmed with Baltimore County Department of Permits, Approvals and Inspections (PAI). Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Permit office
Baltimore County Department of Permits, Approvals and Inspections (PAI)
410-887-3900Permit portalMaryland rule changes
- Howard County, MD raises shed and fence permit-exemption limits (CB24-2025)
CB24-2025 (Bill No. 24-2025) ·
- Montgomery County, MD FY27 permit fee schedules take effect
FY27 Fee Schedule (Council-approved FY27 Budget) ·
Compare
Deck Permit across Maryland