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Montgomery County Finished Basement Permit Cost (2026)

Finished-basement permit fees in Montgomery County, Maryland, pulled directly from the official Montgomery County Department of Permitting Services (DPS) Residential Construction Fee Schedule. Montgomery prices a basement finish as an interior alteration at $0.681345 per square foot, plus a filing fee equal to 50% of the permit fee or $286.60, whichever is greater. A 1,000 square foot basement runs about $1,022 on the building-permit side. Maryland has no statewide percentage levy and the schedule carries no technology fee. Electrical, plumbing, and mechanical trade permits are separate. The published DPS schedule carries an FY2022 printed effective date, so confirm current rates with DPS before relying on these figures.

Alteration Rate
$0.681345 / sq ft
Filing Fee
50% of permit or $286.60 min
1,000 sq ft Basement (permit side)
~$1,022
State / Local Percentage Levy
None (Maryland has no statewide levy)
Trade Permits (electrical / plumbing / HVAC)
Separate (not priced here)
Fee Status
DPS schedule - FY2022 printed date (verify current)
What This Guide Covers - and What It Does Not

This guide covers: Montgomery County, Maryland finished-basement building permit fees as published in the Montgomery County DPS Residential Construction Fee Schedule (AllFees.pdf). Montgomery does not have a dedicated "finished basement" fee line; a basement finish is an interior alteration, priced at the alterations-and-repairs rate of $0.681345 per square foot, with a filing fee of 50% of the permit fee or $286.60, whichever is greater. The square footage used is the finished area.

This guide does NOT cover: Electrical, plumbing, and mechanical (HVAC) trade permits - finishing a basement almost always involves at least electrical and often plumbing for a bathroom or wet bar, and those are separate DPS trade schedules not included in the building-permit figure. Egress window or below-grade bedroom requirements. Sump-pump or waterproofing work. Any structural alteration that triggers additional review.

Classification note: The $0.681345/sq ft figure is Montgomery's alterations-and-repairs rate from the DPS schedule. Whether your specific basement project is filed as an alteration, and exactly which area counts, is determined by DPS at intake - confirm the classification for your project.

Source-age caveat: The DPS AllFees.pdf currently published carries a printed effective period of July 1, 2021 - June 30, 2022 (FY2022). It is the version Montgomery County serves at its official assets path, but the printed effective date is more than 24 months old, so confirm the current alteration rate and filing fee with DPS (240-777-0311) before treating these figures as a load-bearing budget.

Key Takeaways
  • Montgomery County has no dedicated finished-basement fee - a basement finish is an interior alteration, priced at $0.681345 per square foot of finished area.
  • On top of the per-square-foot permit fee, Montgomery adds a filing fee of 50% of the permit fee, or $286.60, whichever is greater - so small basements are dominated by the $286.60 floor.
  • A 1,000 sq ft basement is about $681.35 in permit fee plus a $340.67 filing fee = roughly $1,022 on the building-permit side. A 600 sq ft basement is about $408.81 + the $286.60 floor = roughly $695.
  • The filing-fee floor stops mattering once the basement is large enough that 50% of the permit fee exceeds $286.60 - that happens at about 841 square feet of finished area.
  • Maryland has no statewide percentage building-permit levy, and the DPS schedule carries no technology fee, so there is no percentage add-on like Virginia's 2% USBC levy. The figures here are the building-permit side only.
  • Electrical, plumbing, and HVAC trade permits for the basement are separate DPS schedules and are not included. The DPS schedule carries an FY2022 printed date - confirm current rates with DPS at 240-777-0311.
Open the Permit Fee Calculator All Montgomery County Permit Fees

Montgomery County Finished Basement Fee Structure

Montgomery prices a basement finish as an interior alteration: a per-square-foot permit fee plus a filing fee. The filing fee is the larger of 50% of the permit fee or a $286.60 minimum, so it dominates the cost of a small basement and fades on a large one.

Component Amount How It Is Calculated
Alteration permit fee $0.681345/sq ft Finished area × rate (e.g. 1,000 sq ft = $681.35).
Filing fee 50% of permit, min $286.60 The larger of half the permit fee or $286.60.
State levy / technology fee None Maryland has no statewide levy; the DPS schedule has no technology fee.
Trade permits Separate Electrical, plumbing, HVAC each on their own DPS schedule.
Filing-fee floor crossover ~841 sq ft Above ~841 sq ft, 50% of the permit fee exceeds the $286.60 floor.

Source: Montgomery County DPS Residential Construction Fee Schedule (AllFees.pdf), Alterations or Repairs line ($0.681345/sq ft) and the filing fee (50% of permit or $286.60). Printed effective period FY2022 - source-age flagged. Trade permits are separate. A basement finish is treated as an alteration; confirm the classification and the chargeable area with DPS before filing.

Worked Examples - Real Basement Projects in Montgomery County

Each example prices the finished area at $0.681345/sq ft and adds the filing fee (50% of the permit fee, or the $286.60 minimum). Trade permits are separate and not priced here. Totals are building-permit-side estimates; confirm the exact figure with DPS.

Example 1: 600 sq ft basement finish (filing-fee floor governs)

A homeowner finishes 600 square feet of basement into a rec room. The permit fee is small enough that the $286.60 filing-fee minimum applies.

  • Permit fee: 600 sq ft × $0.681345 = $408.81
  • Filing fee: 50% of $408.81 = $204.41, below the $286.60 floor, so $286.60 applies
  • Maryland percentage levy / technology fee: $0.00 (none)
  • Total building-permit side: ~$695.41

Below about 841 sq ft, the $286.60 filing-fee floor sets the filing portion. Add separate electrical and any plumbing trade permits on top.

Example 2: 1,000 sq ft basement finish (50% filing fee governs)

A homeowner finishes a full 1,000 square foot basement with a rec room and a bathroom. At this size, 50% of the permit fee exceeds the $286.60 floor.

  • Permit fee: 1,000 sq ft × $0.681345 = $681.35
  • Filing fee: 50% of $681.35 = $340.67 (above the $286.60 floor)
  • Maryland percentage levy / technology fee: $0.00 (none)
  • Total building-permit side: ~$1,022.02

The bathroom adds separate plumbing and electrical trade permits, billed on their own DPS schedules and not included in this $1,022 figure.

Example 3: 1,200 sq ft basement finish

A larger 1,200 square foot basement finish in a newer home.

  • Permit fee: 1,200 sq ft × $0.681345 = $817.61
  • Filing fee: 50% of $817.61 = $408.81
  • Maryland percentage levy / technology fee: $0.00 (none)
  • Total building-permit side: ~$1,226.42

Once the basement is large, the building permit scales with the square-foot rate plus a 50% filing fee - so the all-in building-permit cost is about 1.5 times the per-square-foot permit fee.

Montgomery Finished Basement Cost vs Other Verified Jurisdictions

The comparison below uses verified Maryland fees for finishing a 1,000 sq ft basement. Carroll County prices a finished basement as a single flat fee; Charles County builds it up additively; Montgomery prices it per square foot plus a filing fee. Trade permits are excluded everywhere.

Jurisdiction Finished Basement Fee Basis 1,000 sq ft Basement (permit side)
Montgomery County, MD $0.681345/sq ft + 50% filing ~$1,022.02
Carroll County, MD $85 flat (category C) $85.00
Charles County, MD additive (app + plan review + inspections) from ~$305

Carroll County's flat $85 covers any interior alteration regardless of area - by far the cheapest of the three for a finished basement. Charles County builds the fee up additively (a $115 application plus a $0.19/sq ft plan review, $190 at 1,000 sq ft, before any inspection line items - so "from ~$305" is a floor). Montgomery's per-square-foot rate plus a 50% filing fee makes it the most expensive at $1,000 sq ft. All exclude electrical, plumbing, and HVAC trade permits. Montgomery's and Carroll's schedules carry source-age dates (FY2022 and April 6, 2021); Charles is current (FY26).

Related Reading

See the full Montgomery fee picture and compare neighboring counties.

Frequently Asked Questions

Montgomery County prices a finished basement as an interior alteration: $0.681345 per square foot of finished area, plus a filing fee of 50% of the permit fee or $286.60, whichever is greater. A 1,000 sq ft basement is about $681 permit + $341 filing = roughly $1,022 on the building-permit side. A 600 sq ft basement is about $695 (the $286.60 filing floor governs). Electrical, plumbing, and HVAC permits are separate. Figures come from the DPS schedule (FY2022 printed date); confirm with DPS at 240-777-0311.
No. The DPS schedule does not have a separate "finished basement" line. A basement finish is treated as an interior alteration, so it is priced at the alterations-and-repairs rate of $0.681345 per square foot, with the standard 50%/$286.60 filing fee. Exactly how your project is classified, and which area counts, is determined by DPS at intake - confirm before filing.
Montgomery charges a filing fee equal to 50% of the permit fee, or $286.60, whichever is greater. For a small basement the 50% figure is below $286.60, so the $286.60 floor applies and dominates the cost. Once the finished area is larger than about 841 square feet, 50% of the permit fee is more than $286.60, so the filing fee scales with the project instead of sitting at the floor.
No. The building permit covers the alteration itself. Finishing a basement almost always needs at least an electrical permit, and often plumbing for a bathroom or wet bar plus mechanical for HVAC changes - each is a separate DPS trade permit on its own schedule, not included in the $0.681345/sq ft building-permit figure.
Carroll County prices any interior alteration - including a finished basement - as a single flat $85 fee (category C), regardless of area. Montgomery prices the same work per square foot plus a 50% filing fee, so a 1,000 sq ft basement is about $1,022 in Montgomery versus $85 in Carroll. See our Carroll vs Montgomery comparison for the full picture.
The alteration rate and filing fee come from the Montgomery County DPS Residential Construction Fee Schedule (AllFees.pdf) currently published at the county's official assets path. Every section of that PDF carries a printed effective period of "July 1, 2021 - June 30, 2022" (FY2022), which is more than 24 months old, so these are source-age-flagged figures. Confirm the current alteration rate and filing fee with DPS at 240-777-0311 before relying on them for a budget.

Sources

Official Sources - Recorded June 2026
Next Step

Confirm your specific Montgomery basement cost or compare against neighbors.

Always verify current alteration and filing fees directly with the Montgomery County Department of Permitting Services before budgeting or filing. The DPS AllFees.pdf used here carries a printed FY2022 effective period. Call 240-777-0311 or check the DPS website to confirm the current alteration rate, the filing fee, and how your basement project is classified before submitting an application.
Disclaimer: All fee information on PermitPrice is for informational purposes only and is not an official permit quotation. Actual permit fees are determined by the Montgomery County DPS at the time of application. Fee schedules and permit requirements can change without notice. Electrical, plumbing, and HVAC trade permits, egress and structural requirements, and waterproofing are handled separately and are excluded from the figures on this page. Totals shown are building-permit-side estimates.

Written by: Munib Ur Rehman

Data verified against official fee schedule documents.