Washington DC vs Loudoun County Building Permit Fees (2026)
Side-by-side residential building permit fee comparison between Washington, DC (federal district) and Loudoun County (Northern Virginia DMV anchor) for decks, alterations, pools, sheds, and new construction. DC's Department of Buildings uses a 4-tier alteration valuation formula ($30 base + 2% of construction value $1,001-$1M) with a universal 10% Enhanced Fee on every line item plus a separate Green Building Fee (0.13% on alterations $1,001-$1M, or $0.002 per sq ft on new construction). Pools up to 15,000 gallons are a flat $260 + 10% = $286. Garages, sheds, and awnings are $65 + 10% = $71.50 flat. New construction is priced per cubic foot at $0.03/cubic foot. Loudoun County bundles the building permit, plan review, and county zoning permit into a single $395 flat fee for residential additions (including decks, sheds and porches) of 1,000 sq ft or less, ($395.00 to $399.60 all-in). Virginia requires a 2% state levy on building-code permit fees (USBC Section 107.2), but Loudoun's published fees do not say whether that levy is already included or whether it is charged on plan review, so PermitPrice shows each Loudoun total as a range: the published amount up to 2% more on the building permit and plan review portion (the levy never applies to the zoning permit). Residential alterations are priced separately at 1% of construction cost ($65 minimum) plus a $130 plan review fee. DC wins on volume-priced new construction, flat-fee sheds, and alterations below approximately $7,220 to $7,530 declared. Loudoun wins on alterations above that (DC's 2% rate plus Green Building Fee scales faster than Loudoun's 1% plus $130 plan review). In-ground pools depend on whether the Loudoun property is in an incorporated town. The DMV pair shows two opposite ways to price urban residential work.
This comparison covers: Residential building permit fees in Washington, DC and Loudoun County, Virginia, for the most common project types - decks (treated as alterations in DC), alterations (interior remodels), in-ground swimming pools, sheds (flat fee in DC, bundled in Loudoun), and new single-family construction. Both jurisdictions are verified from official .gov sources. DC source: live page on dob.dc.gov/node/1620346, captured April 25, 2026. Loudoun source: loudoun.gov July 2022 residential schedule.
This comparison does NOT cover: Trade permits (electrical, plumbing, mechanical) - filed separately in both jurisdictions and itemized per unit/fixture/circuit in DC; bundled or separate in Loudoun depending on scope. Asbestos abatement and demolition (DC uses the same $30 + 2% structure as alterations; Loudoun lists demolition at a flat $70, or $70.00 to $71.40 with the levy range). The Loudoun over-1,000-sq-ft path (1% of construction value + $335 plan review) is modeled as an estimate. DC's Instant Permit program for solar systems up to 15 kW, in-kind window replacements (up to 15 windows), and similar limited-scope work is not directly compared (DC $33 + 10% = $36.30 vs Loudoun's bundled or unbundled path depending on classification). Filing deposit (DC: 50% of assessed fee, max $20,000) for new construction is mentioned but excluded from the all-in total since it is credited toward the final permit fee at issuance. Zoning approvals, HOA approvals, and contractor labor/material costs are excluded.
What makes this comparison meaningful: Two structurally different DMV urban pricing models. DC's tier formula plus 10% Enhanced is administratively complex but value-responsive - small alterations pay little, large alterations scale. DC also publishes dedicated flat fees for pools, sheds, fences, garages, and awnings. Loudoun's bundled rate eliminates value scaling for decks, sheds, porches and additions of 1,000 sq ft or less, charging the same fee for a $5,000 deck or a $50,000 small addition, while Loudoun alterations scale at 1% of cost plus a $130 plan review. The result is a category-by-category crossover that favors DC on volume-priced new construction, flat-fee sheds, and very small alterations, but favors Loudoun on alterations above about $7,220 to $7,530. Pools depend on whether the Loudoun property is in an incorporated town.
Source-age caveat: Loudoun's fee schedule is dated July 1, 2022, over 4 years old, and still the published version as of November 4, 2026. Virginia requires a 2% state levy on building-code permit fees (USBC Section 107.2), but Loudoun's published fees do not say whether that levy is already included or whether it is charged on plan review, so PermitPrice shows each Loudoun total as a range: the published amount up to 2% more on the building permit and plan review portion (the levy never applies to the zoning permit). DC's fee schedule is a live page (not a dated PDF) and was captured April 25, 2026 - the DC Department of Buildings updates the page when the DC Council adopts new fees. DC's schedule is the current published rate sheet as of the verification date. For load-bearing budgets confirm with DOB Customer Service (202-671-3500) or Loudoun Building and Development before filing.
For a 200 sq ft deck at $15,000 declared value, DC's $384.45 alteration-tier all-in beats Loudoun's bundled $395.00 to $399.60 by $10.55 to $15.15. For a $30,000 in-ground pool, outside Loudoun's incorporated towns Loudoun's $260.00 to $261.90 beats DC's $286.00 flat fee by $24.10 to $26.00; inside a town Loudoun charges $95.00 to $96.90 plus the town's own zoning permit and fees, so it depends on the town fee. For a 320 sq ft detached shed, DC's $71.50 flat fee beats Loudoun's bundled $395.00 to $399.60 by $323.50 to $328.10. For 2,000 sq ft / $400k new construction, DC's volume-priced $532.40 beats Loudoun's over-1,000-sq-ft estimated path ($4,335.00 to $4,421.70 plus zoning) by approximately $3,803 to $3,889. Loudoun's alteration formula (1% of cost + $130 plan review) wins residential alterations above about $7,220 to $7,530 declared: a $30,000 kitchen remodel is $430.00 to $438.60 in Loudoun vs $735.90 in DC, Loudoun saves $297.30 to $305.90. Both verified.
- DC and Loudoun use structurally different fee philosophies. DC uses a 4-tier alteration valuation formula plus dedicated flat fees for pools, sheds, fences, and garages; new construction is priced per cubic foot. Every DC fee carries a universal 10% Enhanced Fee on top, and most alterations and new construction add a separate Green Building Fee (0.13% on alterations $1,001-$1M, or $0.002/sq ft on new construction, each carrying its own 10% Enhanced). Loudoun bundles the building permit, plan review, and county zoning permit into a single $395 flat fee for residential additions (including decks, sheds and porches) of 1,000 sq ft or less ($395.00 to $399.60 all-in depending on the 2% Virginia state levy), and prices residential alterations at 1% of construction cost ($65 minimum) plus a $130 plan review fee.
- For 200 sq ft uncovered decks at $15,000 declared, DC wins narrowly by $10.55 to $15.15 - $384.45 vs Loudoun's $395.00 to $399.60. DC math: $30 base + 2% of $15,000 = $330 + 10% Enhanced ($33) = $363 alteration fee, plus 0.13% Green Building Fee ($19.50) + 10% ($1.95) = $21.45 GBF. Total $384.45 all-in. The Loudoun bundle is $395.00 to $399.60 regardless. Above approximately $15,450 to $15,650 declared deck value Loudoun's flat rate starts to win.
- For typical $30,000 residential alterations, Loudoun wins by $297.30 to $305.90 - $430.00 to $438.60 (1% of $30,000 = $300 + $130 plan review, plus up to $8.60 levy) vs DC's $735.90. DC math at $30,000: $30 + 2% x $30,000 = $630 + 10% ($63) = $693 + Green Building Fee 0.13% x $30,000 = $39 + 10% ($3.90) = $42.90. Total $735.90. Crossover where DC starts to lose to Loudoun: approximately $7,220 to $7,530 declared value alteration. Below the crossover DC's smaller tier base + 10% wins; above it Loudoun's alteration formula wins. The DC 2% rate scales linearly with declared value, so high-value alterations get expensive fast in DC.
- For in-ground swimming pools up to 15,000 gallons, the answer depends on location. Loudoun's official pool page lists $260 for a property not in an incorporated town, including the county building and zoning permits ($260.00 to $261.90 with the levy range), which is $24.10 to $26.00 below DC's dedicated $260 flat + 10% = $286.00 fee. Inside an incorporated town (Leesburg, Purcellville, Middleburg, Hamilton, Hillsboro, Lovettsville, Round Hill) Loudoun charges $95 ($95.00 to $96.90) for the county building permit only, plus the town's own zoning permit and fees, which are not published here - so it depends on the town fee. DC's pool flat fee is structurally cheap relative to its alteration tier formula because pools are priced as a category, not as a value-scaling alteration. Pools over 15,000 gallons add $33 per additional 1,000 gallons + 10% Enhanced. Most residential pools are well under 15,000 gallons - a typical 16-by-32 ft pool holds around 14,000-18,000 gallons depending on depth, so larger luxury pools may cross the threshold.
- For detached sheds and garages, DC's $65 flat + 10% = $71.50 dominates Loudoun's bundled $395.00 to $399.60 by $323.50 to $328.10. DC's shed/garage flat fee applies to new construction up to a size limit (larger garages with substantial cubic footage may be priced as new construction at $0.03/cubic foot instead - confirm scope with DOB at filing). For typical 200-400 sq ft residential sheds, the $71.50 flat fee is the structural winner. Loudoun's bundle covers sheds of 1,000 sq ft or less at $395.00 to $399.60.
- For new single-family construction, DC's $0.03/cubic foot pricing produces dramatic savings on standard residential dwellings. A 2,000 sq ft single-family detached home (assuming 8-ft ceilings = 16,000 cubic ft) pays DC: $0.03 x 16,000 = $480 + 10% ($48) = $528 building permit + Green Building Fee $0.002/sq ft x 2,000 = $4 + 10% ($0.40) = $4.40 GBF = $532.40 all-in. Loudoun's over-1,000-sq-ft path estimates at 1% of $400,000 = $4,000 + $335 plan review = $4,335, or $4,421.70 with the 2% levy, plus the county zoning permit. DC saves approximately $3,803 to $3,889 on a typical new SFD. This is one of the rare cases where DC is the structurally cheapest jurisdiction in the DMV cluster for a project type.
- DC's filing deposit (50% of the assessed permit fee, capped at $20,000) applies to new construction and additions priced as new construction. The deposit is credited toward the final permit fee at issuance, so it does not increase the total cost - just shifts the cash timing. For a $532.40 new SFD permit the filing deposit at submission would be approximately $266.20 + 10% Enhanced, credited at issuance. Loudoun does not require a filing deposit; the bundled fee is paid in full at application.
- Both fee structures are verifiable from official .gov sources. DC's source is dob.dc.gov/node/1620346 (live page, no dated PDF; captured April 25, 2026). Loudoun's source is loudoun.gov/96/Building-Development (July 2022 residential schedule, still current as of November 4, 2026; source-age caveat applies) plus loudoun.gov/5382 for pools. Virginia requires a 2% state levy on building-code permit fees (USBC Section 107.2), but Loudoun's published fees do not say whether that levy is already included or whether it is charged on plan review, so PermitPrice shows each Loudoun total as a range: the published amount up to 2% more on the building permit and plan review portion (the levy never applies to the zoning permit). Trade permits are excluded from every figure on this page. DC's pricing model is administratively complex but value-responsive; Loudoun's bundled rate is administratively simple but value-blind. Choosing between the two for a specific project means knowing the project type and declared value first.
Fee Structure Side-By-Side
DC uses category-specific pricing (tier formula for alterations, flat fees for pools/sheds/fences, cubic-foot rate for new construction) with universal 10% Enhanced Fee. Loudoun uses one bundle for decks, sheds, porches and additions of 1,000 sq ft or less and a 1%-of-cost formula for alterations.
| Component | Washington DC | Loudoun County |
|---|---|---|
| Building permit (alteration, $30k) | $30 + 2% formula = $630 + 10% Enhanced | 1% of $30,000 = $300 + $130 plan review |
| Building permit (deck, treated as alteration) | Alteration tier formula | $395 bundled |
| Building permit (pool ≤15,000 gal) | $260 + 10% Enhanced = $286.00 | $260 outside incorporated towns (county building + zoning); $95 inside a town (county building only, town fees extra) |
| Building permit (shed/garage) | $65 + 10% = $71.50 | $395 bundled |
| Building permit (fence on private property) | $33 + 10% = $36.30 | No fence line in the published schedule |
| Building permit (new construction) | $0.03/cubic foot + 10% Enhanced | Estimated 1% + $335 PR (over 1,000 sq ft) |
| Plan review | Bundled into permit fee (first-pass) | Bundled into $395 |
| Universal surcharge | 10% Enhanced Fee (every line) | The 2% Virginia state levy, if not already included, on building permit + plan review (not shown in published fees; never on zoning) |
| Green Building Fee (alteration $1,001-$1M) | 0.13% + 10% Enhanced | None |
| Green Building Fee (new construction) | $0.002/sq ft + 10% Enhanced | None |
| Alteration all-in ($30,000) | $735.90 | $430.00 to $438.60 |
DC source: dob.dc.gov/node/1620346 (Building Permit Fee Schedule live page, captured April 25, 2026). Loudoun source: loudoun.gov/96/Building-Development (July 2022 residential schedule). DC's 10% Enhanced Fee is applied to every line item (building permit, plan review, supplemental permits, trade permits). The Green Building Fee is a separate component on alterations $1,001-$1M and on new construction, each carrying its own 10% Enhanced surcharge.
Worked Examples - Same Project Type, Both Jurisdictions
Five worked examples comparing identical project types in DC and Loudoun. Each example uses the same declared construction value or area on both sides. Trade permits are excluded; DC's 10% Enhanced Fee and Green Building Fee are applied per DOB's published practice.
A homeowner builds a 10-by-20 ft (200 sq ft) attached uncovered deck off the kitchen, ledger board attached to the dwelling, declared construction value $15,000. DC treats decks under the alteration tier formula.
- DC: alteration tier $30 + 2% x $15,000 = $30 + $300 = $330 + 10% Enhanced ($33) = $363. Green Building Fee 0.13% x $15,000 = $19.50 + 10% Enhanced ($1.95) = $21.45. Total = $384.45
- Loudoun: bundled $395 + the 2% levy, if not already included, on $230 ($0 to $4.60) = $395.00 to $399.60
- Difference: DC saves $10.55 to $15.15
DC's tier formula plus Green Building Fee narrowly beats Loudoun's bundle at typical $15,000 deck declared value. Above approximately $15,450 to $15,650 declared value DC's 2% rate climbs past Loudoun's flat deck bundle and Loudoun starts to win.
A homeowner remodels a kitchen with new cabinets, countertops, lighting, minor electrical/plumbing - declared construction value $30,000, no addition to footprint.
- DC: alteration tier $30 + 2% x $30,000 = $30 + $600 = $630 + 10% Enhanced ($63) = $693. Green Building Fee 0.13% x $30,000 = $39 + 10% Enhanced ($3.90) = $42.90. Total = $735.90
- Loudoun: 1% of $30,000 = $300 building permit + $130 plan review + the 2% levy, if not already included, on $430 ($0 to $8.60) = $430.00 to $438.60
- Difference: Loudoun saves $297.30 to $305.90
DC's 2% rate on alterations scales linearly with declared value. Above approximately $7,220 to $7,530 declared value DC starts to lose to Loudoun's alteration formula (1% of cost + $130 plan review). At $30,000 declared the Loudoun advantage is $297.30 to $305.90. At $100,000 alteration DC pays $2,376.00 vs Loudoun's $1,130.00 to $1,152.60 - Loudoun saves $1,223.40 to $1,246.00.
A homeowner installs a 16-by-32 ft (512 sq ft) in-ground swimming pool, declared construction value $30,000. Assume pool capacity is at or under 15,000 gallons (typical 4-5 ft average depth at this footprint).
- DC: pool ≤15,000 gallons flat $260 + 10% Enhanced ($26) = $286.00
- Loudoun, not in an incorporated town: $260 published ($95 county building permit + $165 county zoning permit) + the 2% levy, if not already included, on $95 ($0 to $1.90) = $260.00 to $261.90
- Loudoun, in an incorporated town: $95 county building permit + up to $1.90 levy = $95.00 to $96.90, plus the town's zoning permit and fees (not included)
- Difference: depends on location. Outside towns Loudoun saves $24.10 to $26.00; inside a town Loudoun's county fee is $189.10 to $191.00 lower before the town's own fees
DC's flat pool fee is value-blind for pools under 15,000 gallons - the same $286 applies to a $20,000 pool and a $100,000 luxury pool. Loudoun's $395 bundle does not apply to pools. Loudoun's official pool page (loudoun.gov/5382) lists $260 outside incorporated towns (county building and zoning permits) and $95 inside a town (county building permit only), with no plan review fee listed; trade and grading permits are separate. For pools over 15,000 gallons DC adds $33 per additional 1,000 gallons + 10% Enhanced.
A homeowner installs a 16-by-20 ft (320 sq ft) detached shed at the rear corner of the property, declared construction value $5,000. DC prices new sheds and garages as a flat fee; Loudoun bundles it into the $395 small-project rate.
- DC: shed flat $65 + 10% Enhanced ($6.50) = $71.50
- Loudoun: bundled $395 + the 2% levy, if not already included, on $230 ($0 to $4.60) = $395.00 to $399.60
- Difference: DC saves $323.50 to $328.10
DC's flat shed/garage fee is structurally cheap. For very large garages with substantial cubic footage, DOB may classify the project as new construction at $0.03/cubic foot instead - confirm scope at filing. Most residential 200-400 sq ft sheds qualify for the $65 + 10% = $71.50 flat fee.
A homeowner builds a 2,000 sq ft new single-family detached dwelling, declared construction value $400,000. Assume 8-ft ceiling height (16,000 cubic feet of volume). Loudoun's over-1,000-sq-ft estimated path applies.
- DC: new construction $0.03/cubic foot x 16,000 = $480 + 10% Enhanced ($48) = $528 building permit + Green Building Fee $0.002/sq ft x 2,000 = $4 + 10% Enhanced ($0.40) = $4.40 GBF. Total = $532.40
- Loudoun (over 1,000 sq ft path, estimated): 1% of $400,000 = $4,000 + $335 plan review = $4,335 + the 2% levy, if not already included ($0 to $86.70) = ~$4,335.00 to $4,421.70 plus the county zoning permit (estimated)
- Difference: DC saves approximately $3,803 to $3,889 or more
DC's volume-based new construction pricing is structurally dramatic at scale. The Loudoun over-1,000-sq-ft estimated path scales with declared value at 1% plus a fixed $335 plan review. The 2,000 sq ft / $400,000 SFD case is the steepest DMV gap in favor of DC. Filing deposit (DC: 50% of $528 = $264 + 10%) is paid at submission and credited at issuance, not an additional cost.
Decision Rule - DC vs Loudoun by Project Type
Project type drives the structural winner. DC dominates volume-priced new construction, flat-fee sheds, and very small alterations. In-ground pools depend on whether the Loudoun property is in an incorporated town, and Loudoun dominates residential alterations above about $7,220 to $7,530 declared because DC's 2% rate plus Green Building Fee scales faster than Loudoun's 1% rate plus $130 plan review.
| Project Type | Cheaper Jurisdiction | Approximate Savings | Notes |
|---|---|---|---|
| Deck ($15k declared) | DC | $10.55 to $15.15 | DC $384.45 vs Loudoun $395.00 to $399.60. Narrow margin. Above about $15,450 to $15,650 declared Loudoun wins. |
| Alteration (under ~$7,220 to $7,530 declared) | DC | $44.85 to $48.75 at $5,000 | DC $150.15 vs Loudoun $195.00 to $198.90 at $5,000. Loudoun's alteration minimum is $65 permit + $130 plan review, plus the 2% levy, if not already included. |
| Alteration ($30k declared) | Loudoun | $297.30 to $305.90 | DC $735.90 vs Loudoun $430.00 to $438.60. DC's 2% rate plus Green Building Fee climbs faster than Loudoun's 1% + $130 above the ~$7,220 to $7,530 crossover. |
| Alteration ($100k+ declared) | Loudoun | $1,223.40 to $1,246.00+ | DC $2,376.00 vs Loudoun $1,130.00 to $1,152.60 at $100,000. Both scale with value; DC's combined rate is more than twice Loudoun's. |
| In-ground pool ≤15,000 gallons | Depends on location | Outside towns: Loudoun by $24.10 to $26.00 | Loudoun $260.00 to $261.90 outside incorporated towns, or $95.00 to $96.90 plus town zoning and fees inside a town, vs DC $286.00 flat. |
| Shed or garage (typical residential) | DC | $323.50 to $328.10 | DC $71.50 vs Loudoun $395.00 to $399.60 bundle. Large garages may be priced as new construction. |
| Fence on private property | Not comparable | n/a | DC charges a flat $36.30. Loudoun's July 2022 fee schedule has no fence line, so no Loudoun figure is published here; ask Loudoun Building and Development whether your fence needs a building or zoning permit. |
| New single-family construction (2,000 sq ft / $400k) | DC | ~$3,803 to $3,889+ | DC volume-priced $532.40 vs Loudoun estimated over-1,000-sq-ft path $4,335.00 to $4,421.70 plus zoning. |
| Addition (under 1,000 sq ft, $40k+ declared) | Loudoun | $570.60 to $575.20 at $40,000 | Loudoun's bundled rate wins: DC's alteration tier is $970.20 at $40,000 ($30 + 2% of value, Green Building Fee 0.13%, 10% Enhanced on both) vs Loudoun's $395.00 to $399.60, and the gap grows by about $22.43 per extra $1,000 declared. |
Decision-rule conclusion: a homeowner planning new single-family construction, a detached shed, or a very small alteration under about $7,220 to $7,530 declared saves in DC. An in-ground pool is cheaper in Loudoun outside its incorporated towns ($260.00 to $261.90 vs $286.00); inside a town it depends on the town's own zoning fee. A homeowner planning a residential alteration above about $7,220 to $7,530 declared (kitchen remodels, bath renovations, basement finishes, whole-house remodels) saves significantly in Loudoun, which charges 1% of cost plus a $130 plan review. The decision is driven by project category and declared value. Trade permits, Green Building Fee variations on commercial scope, and HOA approvals are excluded from every row.
Frequently Asked Questions
Sources
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DC Department of Buildings - Building Permit Fee Schedule Live page captured April 25, 2026 - Primary source for DC's 4-tier alteration valuation formula ($30 base + 2% of construction value $1,001-$1M, tier ceilings at $500 / $1,000 / $1,000,000), $0.03/cubic foot new construction, flat fees for pools ≤15,000 gal ($260), garage/shed ($65), fence on private property ($33), 10% Enhanced Fee universal surcharge, and Green Building Fee on alterations and new construction. Retrieved via Fetch MCP from dob.dc.gov/node/1620346 Verified live
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Loudoun County Building and Development - Residential Fee Schedule Effective July 1, 2022 - Primary source for Loudoun's bundled $395 flat fee for residential additions of 1,000 sq ft or less, made up of the $100 building permit (page 9), $130 plan review (page 10) and $165 residential zoning permit (page 13), and for the residential alteration formula (1% of construction cost, $65 minimum permit fee, plus a $130 plan review fee). The schedule does not say whether the required 2% Virginia state levy is already included, so PermitPrice shows Loudoun totals as ranges. The same schedule lists Demolition of a building or structure $70 (page 9). Still the published version as of November 4, 2026 Verified July 2022 (caveat)
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Code of Virginia Section 36-137(7) - State Levy Authority Current - Virginia General Assembly - Enabling statute for the state levy; USBC Section 107.2 (13VAC5-63-70) requires it at 2% of fees charged for building-code permits, collected by the local building department; it does not apply to county zoning permits
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Loudoun County - Pools Verified November 4, 2026 - Loudoun County, VA - Source for pool fees: $260 outside incorporated towns (includes county building and zoning permit fees); $95 inside an incorporated town (county building permit fee only; town zoning permit and fees separate); trade and grading permits separate
See the full DC and Loudoun fee schedules or compare against other DMV jurisdictions.