Carroll County vs Baltimore County, MD Building Permit Fees (2026)
Carroll County and Baltimore County both price residential permits as flat fees, and neither adds a statewide Maryland levy - so this is a clean flat-versus-flat comparison. Carroll uses a single flat fee by project category (a deck is $60, residential solar $60); Baltimore County uses area-based fee categories with flat line items for common residential work (a deck is $85, solar $79). The catch on both is source age: Carroll's published schedule carries an April 6, 2021 date and Baltimore County's carries a November 26, 2018 date - the oldest verified Maryland schedule we publish. Read the source-age notes before budgeting.
For the clean flat-fee projects, Carroll County is lower: a residential deck is a flat $60 in Carroll vs $85 in Baltimore County, and residential solar is $60 vs $79. A finished basement is a flat $85 in Carroll; Baltimore County does not itemize a finished-basement line. Neither county adds a statewide Maryland levy. Both published schedules carry source-age caveats - Carroll April 2021, Baltimore November 2018 - so confirm current rates with each county before relying on the figures.
- Both counties price common residential projects as flat fees with no statewide Maryland levy and no percentage technology fee - so the dollar figure is the whole building permit charge on each side.
- On the clean overlapping projects, Carroll is cheaper: deck $60 vs $85, residential solar $60 vs $79. Carroll's flat-by-category schedule lands a little below Baltimore County's flat line items.
- Carroll itemizes a flat $85 finished-basement/alteration line (category C); Baltimore County's extracted schedule does not itemize a finished-basement line, so we do not publish a Baltimore basement figure - confirm it with the county.
- For a new house, the two are not directly comparable from the published data: Carroll is $170 + $0.12/sq ft (about $458 for a 2,400 sq ft home), while Baltimore County lists a $231 residential minimum on an area-based category whose per-square-foot rate is not in our extracted schedule - so do not conclude one is cheaper for new construction.
- Both schedules are old. Carroll's carries an April 6, 2021 printed date; Baltimore County's carries a November 26, 2018 date (over seven years), the oldest verified Maryland schedule we publish. Both are flagged.
- Trade permits (electrical, plumbing), impact/development fees, and zoning are excluded on both sides - they are governed by separate schedules in each county.
Carroll vs Baltimore County: Fee Structure Side by Side
| Fee Element | Carroll County | Baltimore County |
|---|---|---|
| Fee model | Flat fee by category | Area-based categories + flat line items |
| Deck | $60 flat | $85 (≤600 sq ft) / $119 |
| Residential solar | $60 flat | $79 flat |
| Finished basement / alteration | $85 flat (category C) | Not itemized - verify |
| Fence (residential) | Not itemized - verify | $25 flat |
| New residential construction | $170 + $0.12/sq ft | Category D, $231 minimum (area-based) |
| State levy / technology fee | None | None |
| Fee schedule effective | April 6, 2021 (verify current) | November 26, 2018 (verify current) |
Scope note: Both counties' flat fees include their filing fees but exclude separate trade permits (electrical, plumbing), impact/development fees, and zoning. Carroll does not itemize a residential fence line and Baltimore County does not itemize a finished-basement line, so each is shown as "verify" rather than guessed. Baltimore County's new-construction figure is a stated $231 minimum on an area-based category; the per-square-foot residential rate is not in our extracted schedule, so a 2,400 sq ft home total is not published here.
Shared-Assumption Worked Examples
Each example assumes the same project for both counties. Because both price these projects as flat fees, the math is simple - the difference is the fixed figure each county sets.
Example 1: Residential Deck
| Fee Component | Carroll County | Baltimore County |
|---|---|---|
| Deck building permit | $60.00 flat (category B) | $85.00 (≤600 sq ft) |
| State / local levy | $0.00 | $0.00 |
| Total (building-permit side) | $60.00 | $85.00 |
Note: Carroll is $25 lower. A deck over 600 sq ft in Baltimore County rises to $119; Carroll stays flat at $60 at any size. Deck electrical, if any, is a separate trade permit in both counties.
Example 2: Residential Solar Panels
| Fee Component | Carroll County | Baltimore County |
|---|---|---|
| Solar building permit | $60.00 flat (category F) | $79.00 flat |
| State / local levy | $0.00 | $0.00 |
| Total (building-permit side) | $60.00 | $79.00 |
Note: Carroll is $19 lower for residential rooftop solar. The electrical interconnection is a separate trade permit in both counties and is excluded here.
Example 3: New Detached House, 2,400 sq ft (not directly comparable)
| Fee Component | Carroll County | Baltimore County |
|---|---|---|
| Base | $170.00 (category A) | $231.00 minimum (category D) |
| Per-square-foot | 2,400 × $0.12 = $288.00 | rate not in extracted schedule |
| Total (building-permit side) | $458.00 | from $231.00 |
Note: These are NOT directly comparable. Carroll's $458 is a full computed figure ($170 + $0.12/sq ft). Baltimore County's $231 is only the stated residential minimum for its area-based Category D; the per-square-foot residential rate is not in our extracted schedule, so the actual Baltimore fee for a 2,400 sq ft home may be higher. Do not conclude Baltimore County is cheaper for new construction from these numbers - confirm the area-based fee with the county.
Which County Is Cheaper for Your Project?
| Scenario | Lower Fee | Why |
|---|---|---|
| Deck | Carroll ($60 vs $85) | Carroll's flat category B is $25 below Baltimore County's flat deck line |
| Residential solar | Carroll ($60 vs $79) | Carroll's flat category F is $19 below Baltimore County's flat solar line |
| Finished basement | Carroll ($85 flat) | Carroll itemizes a flat $85 line; Baltimore County does not itemize a basement line |
| Fence | Baltimore County ($25 flat) | Baltimore itemizes a flat $25 fence line; Carroll does not itemize a fence line |
| New detached house | Not directly comparable | Carroll computes to ~$458; Baltimore lists a $231 minimum with an unpublished per-SF rate |
| Most current schedule | Carroll (2021 vs 2018) | Both are old; Carroll's April 2021 schedule is more recent than Baltimore's November 2018 |
Practitioner Insight
These two counties are the easy end of Maryland permit pricing: flat fees, no state levy, no percentage technology fee. For the projects both itemize the same way - a deck, residential solar - Carroll lands a little below Baltimore County, by $25 on a deck and $19 on solar. That gap is small in dollar terms, so for most homeowners the deciding factor is not which county is a few dollars cheaper but two practical cautions. First, both published schedules are old: Carroll's carries an April 2021 date and Baltimore County's a November 2018 date - over seven years - which is the oldest verified Maryland schedule we publish, so a quick call to confirm current rates is worth more than the $20 difference. Second, the two schedules itemize different things: Carroll has a clean flat $85 line for a finished basement but no fence line, while Baltimore County itemizes a $25 fence but no finished-basement line. For new construction, do not read the headline numbers as a verdict - Carroll's $458 is fully computed, but Baltimore County's $231 is only a minimum on an area-based category whose per-square-foot rate is not published in our extracted schedule.
Frequently Asked Questions
Sources
-
Carroll County Building Permit Fee Schedule Effective April 6, 2021 - Carroll County, MD - verify current
-
Baltimore County Building Permit Fee Schedule (PAI) Effective November 26, 2018 - Baltimore County, MD - verify current
See each county's full fee page, or compare more Maryland jurisdictions.