Howard County Addition Permit Cost (2026)
Building a home addition in Howard County, Maryland, needs a building permit, and the fee comes straight from the official Howard County Department of Inspections, Licenses and Permits (DILP) FY26 Building Permit Fee Schedule. Howard County prices a residential addition at $0.25 per gross square foot of new area plus a $50 filing fee and a 10% technology fee on the permit fee. A typical 400 sq ft addition works out to about $160. Maryland has no statewide percentage levy. The schedule is current, effective July 1, 2025.
This guide covers: Howard County, Maryland residential addition building permit fees as published in the DILP FY26 Building Permit Fee Schedule. An addition is $0.25 per gross square foot plus a $50 non-refundable filing fee and a 10% technology fee assessed on the permit fee. This building permit covers the structural side of the addition.
This guide does NOT cover: Trade permits - the electrical, plumbing, and mechanical (HVAC) permits for the new space are each filed separately on Howard County's own trade fee schedules and are not priced here. Whether DILP counts gross or net square footage for a specific addition - confirm chargeable area with DILP. Excise tax, the Public School Facility Surcharge, and Moderate Income Housing fee-in-lieu, which are assessed separately under their own council resolutions. Zoning, grading, and stormwater approvals. HOA approvals. Contractor labor and material costs.
How the worked totals are labeled: The dollar totals below are computed estimates, derived by direct arithmetic from the three verified inputs (the $0.25/sq ft rate, the $50 filing fee, and the 10% technology fee). The square footage you enter and whether DILP uses gross or net area will change the result, so treat each total as an estimate, not a quotation.
A Howard County, MD residential addition building permit costs $0.25/sq ft plus a $50 filing fee and a 10% technology fee on the permit fee. For a 400 sq ft addition that is $100 permit + $10 technology fee + $50 filing = about $160. An 800 sq ft addition is about $270 and a 1,000 sq ft addition about $325. Maryland adds no statewide percentage levy. Electrical, plumbing, and HVAC for the new space are separate trade permits. These figures come from the DILP FY26 schedule effective July 1, 2025; confirm details with DILP at 410-313-2455.
- Howard County prices a home addition at $0.25 per gross square foot - the same per-square-foot rate it uses for new single-family construction.
- On top of the per-square-foot permit fee, an addition carries a flat $50 filing fee and a 10% technology fee. The technology fee applies to the permit fee, not to the filing fee.
- A typical 400 sq ft addition is about $160 ($100 permit + $10 technology fee + $50 filing). An 800 sq ft addition is about $270 and a 1,000 sq ft addition about $325.
- Maryland has no statewide percentage building-permit levy, so there is no 2% add-on like Virginia's USBC levy. The per-square-foot fee plus filing and technology fees is the building permit charge for the structure.
- Trade work is separate. The electrical, plumbing, and mechanical permits for the new space are filed on Howard County's own trade schedules and are not included in these figures.
- The DILP FY26 schedule is current, effective July 1, 2025. Confirm the per-square-foot rate and chargeable area with DILP at 410-313-2455 before filing.
Howard County Addition Permit Fee Structure
Howard County prices a residential addition on a per-square-foot basis with two add-ons: a flat filing fee and a percentage technology fee. There is no state levy. The permit fee is the new gross area times $0.25, the filing fee is a flat $50 for an addition, and the technology fee is 10% of the permit fee. Trade permits for electrical, plumbing, and HVAC are billed separately.
| Component | Amount | How It Is Calculated |
|---|---|---|
| Permit fee (per square foot) | $0.25 / sq ft | New gross area × $0.25. |
| Filing fee | $50 flat | Non-refundable filing fee for a residential addition. |
| Technology fee | 10% of permit fee | Ten percent of the per-square-foot permit fee (not the filing fee). |
| Electrical / plumbing / HVAC | Separate | Filed on Howard County's trade fee schedules - not priced here. |
| State / local percentage levy | None | Maryland has no statewide USBC-style percentage levy. No 2% add-on. |
Source: Howard County DILP FY26 Building Permit Fee Schedule (Council Resolution #96-2025), New Construction or Addition line - $0.25 per gross square foot for residential single-family, $50 addition filing fee, plus a 10% technology fee on all permits. Effective July 1, 2025. Trade permits (electrical, plumbing, mechanical) are billed separately. Confirm chargeable area with DILP before filing.
Worked Examples - Real Addition Projects in Howard County
Each total below is a computed estimate from the three verified inputs: $0.25/sq ft for the permit fee, a flat $50 filing fee, and a 10% technology fee on the permit fee. Trade permits are separate and not priced here. Confirm chargeable area with DILP.
A homeowner adds a 400 sq ft family-room extension on a single-family home in Ellicott City.
- Permit fee: 400 × $0.25 = $100.00
- Technology fee: 10% × $100.00 = $10.00
- Filing fee: $50.00
- Maryland percentage levy: $0.00 (none)
- Building permit total (estimate): $160.00
- Electrical / plumbing / HVAC: separate - not priced here
A homeowner adds an 800 sq ft addition with a new bedroom and bathroom.
- Permit fee: 800 × $0.25 = $200.00
- Technology fee: 10% × $200.00 = $20.00
- Filing fee: $50.00
- Maryland percentage levy: $0.00 (none)
- Building permit total (estimate): $270.00
The plumbing permit for the new bathroom and the electrical permit for the new circuits are separate Howard County trade permits, not included in the $270.00.
A homeowner builds a large 1,000 sq ft addition.
- Permit fee: 1,000 × $0.25 = $250.00
- Technology fee: 10% × $250.00 = $25.00
- Filing fee: $50.00
- Maryland percentage levy: $0.00 (none)
- Building permit total (estimate): $325.00
Each total is direct arithmetic from the verified $0.25/sq ft rate, the $50 filing fee, and the 10% technology fee. The square footage and whether DILP uses gross or net area will change the result - confirm with DILP.
Howard County Addition Cost vs Other Verified Jurisdictions
Howard's $0.25/sq ft addition rate is on the low end of the verified Maryland cluster. The comparison below uses a 400 sq ft addition and mixes fee bases, so read the basis column. Trade permits are excluded everywhere because they vary by scope.
| Jurisdiction | Addition Fee Basis | 400 sq ft Addition |
|---|---|---|
| Howard County, MD | $0.25/sq ft + $50 filing + 10% tech | ~$160.00 |
| Montgomery County, MD | $0.767865/sq ft + filing | ~$593.75 |
| Baltimore County, MD | $85 (≤600 sq ft) / $130 (over) | $85.00 |
Howard charges $0.25/sq ft plus a $50 filing fee and a 10% technology fee (about $160 for a 400 sq ft addition); Montgomery County charges $0.767865/sq ft plus a large filing fee (about $593.75 for the same addition); Baltimore County uses a flat $85 up to 600 sq ft and $130 over. None of the three adds a state levy, and trade permits are excluded everywhere. Howard figures are the current FY26 schedule; Montgomery figures carry a FY2022 printed period; Baltimore County figures a November 2018 effective date.
See how Howard compares head-to-head against its Maryland neighbors.
Frequently Asked Questions
Sources
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Howard County DILP FY26 Building Permit Fee Schedule (Council Resolution #96-2025) Effective July 1, 2025 - Howard County, MD - Primary source for the addition rate ($0.25/sq ft), $50 filing fee, and 10% technology fee. Extracted and recorded June 2026
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Howard County Department of Inspections, Licenses and Permits (DILP) Accessed June 2026 - Howard County, MD - Official department page hosting the building permit and trade fee schedules. Phone 410-313-2455
Confirm your specific Howard addition permit cost or compare against neighbors.