LA ADU permit fees 2026: every fee, who charges it, and what it actually costs

LA ADU permitting in 2026 carries 15+ separate fees from 4 different government bodies. Most homeowners get blindsided by 3 or 4 of them, and the surprises usually arrive at the issuance step right when they're trying to pull the permit. This guide walks every fee line by line, who charges it, when it triggers, and what 2026 amounts look like.

Quick answer

For a typical 500 sqft detached ADU in LA City built from a pre-approved PRADU plan, expect $8,000 to $14,000 in total government fees in 2026. Add another $2,000 to $4,000 in soft costs (survey, title sheet prep, disclosures). Construction itself runs $150,000 to $250,000 separately.

Fee category	Typical 2026 amount	Who charges	When triggered
Building plan check	$1,500-$3,500	LADBS	At submittal
Sub-permit plan check (M/E/P)	$400-$1,000 each	LADBS	At submittal
Building permit issuance	$4,500-$9,500	LADBS	At final approval
State surcharges (SMI, CBSC, etc.)	$200-$500	State of CA, via LADBS	At issuance
City surcharges (records, tech)	$100-$300	LADBS	At issuance
LAUSD school impact fee	$0 or $3,600+	LAUSD	ADUs over 750 sqft only
LA RID (Residential Impact Development)	$1,000-$3,000	LA Planning	Varies by Council District + size
Sewer connection / cap	$0-$5,000+	LA Bureau of Sanitation	New sewer lateral or upsize
Grading permit	$1,500-$4,000	LADBS	Hillside lots or >50 cu yd earth movement
Driveway / approach permit	$300-$1,500	LA Bureau of Engineering	New curb cut required
Bureau of Sanitation surcharges	$100-$400	LA Bureau of Sanitation	At issuance

The "$8K-$14K total" range assumes a flat-lot ADU under 750 sqft. Hillside, over-750-sqft, or new-sewer-lateral projects can push fees to $18K-$30K. The biggest swings come from school fees (binary trigger at 750 sqft) and sewer work (binary trigger on new lateral vs reuse of existing).

Two binary triggers move the budget the most:

• 750 sqft school fee: ADU at or under 750 sqft pays $0 in LAUSD fees. One sqft over and you pay $4.79 × every habitable sqft, not just the amount over the threshold.
• Sewer lateral: reusing the existing lateral costs $0-$1,500. Needing a new one costs $5,000-$15,000. Check lateral capacity BEFORE you finalize ADU placement.

LADBS plan check fees

Charged at submittal. Pays for the work of LADBS reviewers across the plan check pipeline (Zoning, Building, Mechanical, Electrical, Plumbing, Fire, Energy, Green, etc.). See the LADBS plan check pipeline guide.

Building plan check fee Typically 65% of the eventual building permit fee, paid upfront. For a 500 sqft ADU with a $30,000 declared valuation, this works out to roughly $1,500-$2,500. Larger or more complex projects scale up. LADBS calculates the building permit fee from a valuation table, then back-calculates the plan check portion. See LADBS fee schedule on dbs.lacity.gov.

Sub-permit plan check fees Plumbing, electrical, and mechanical sub-permits each carry their own plan check fee. Typically $400 to $1,000 each. A standard ADU triggers all three (plumbing for the new fixtures, electrical for the new circuits, mechanical for the HVAC).

Fire plan check Separate fee when the project requires Fire Department review. Triggers automatically in VHFHSZ (Very High Fire Hazard Severity Zones) and for ADUs above sprinkler-trigger thresholds. Typically $250 to $700.

LADBS issuance fees

Charged when the permit is pulled, after plan check approval. Pays for the building permit itself plus mandatory state surcharges and city overhead.

• Building permit fee: the headline number. Calculated from project valuation per the LADBS fee schedule. A 500 sqft detached ADU at a $30,000 valuation runs $4,500-$6,500. A 1,000 sqft ADU at $60,000 valuation runs $7,500-$9,500. The formula uses brackets, so the fee per dollar of valuation decreases as project size grows.
• State seismic surcharge (SMI): Strong Motion Instrumentation Program. 0.013% of project valuation. On a $30,000 valuation, this is $4. Small but mandatory.
• California Building Standards Commission (CBSC) surcharge: $4 per $100,000 of valuation. Funds state code development.
• Records management fee: $50-$200 for archiving permit records. Scales with project size.
• Technology fee: 6% of the permit fee. Funds PermitLA and ePlanLA. On a $5,000 permit fee this is $300.
• Permit issuance fee: flat $30-$50 administrative fee.
• Bureau of Sanitation surcharges at issuance: stormwater fee + sewer service charges + small assessments. Total $100-$400 at issuance. The larger sewer connection fee, if applicable, is handled separately (see Sewer section below).

Impact fees (the ones that surprise people)

These are not LADBS fees. They're imposed by other LA agencies and trigger at specific size thresholds.

• LAUSD school impact fee: $4.79 per habitable sqft in 2026. ADUs at or below 750 sqft pay $0 (state-mandated exemption). ADUs over 750 sqft pay on the full square footage, not just the amount over 750. A 751 sqft ADU pays $4.79 × 751 = $3,597. A 1,200 sqft ADU pays $4.79 × 1,200 = $5,748. This is why LA ADUs commonly hit 749 sqft and stop there.
• LA Residential Impact Development (RID) fee: LA City Planning fee for parks, libraries, infrastructure. Schedule varies by Council District. Typically $1,000-$3,000 for an ADU. Not all jurisdictions impose this; verify with the planning department for your specific district.
• Bureau of Engineering plan check fee: $300-$1,500. Required when the project involves work in the public right-of-way (new driveway, sewer connection, sidewalk modification).

Sewer connection fees

Highly variable. Determined by whether your ADU uses the existing sewer lateral or needs a new one.

• Reusing existing lateral: $0-$1,500 for tie-in and verification work. Most common for ADUs sited near the primary dwelling. Bureau of Sanitation may require existing-condition verification before approval.
• New sewer lateral required: $5,000-$15,000 depending on lateral length, depth, and street type. Cutting asphalt is cheaper than cutting concrete. Triggered when the ADU is too far from the primary lateral or the lateral is too small to accept the added flow. Permit costs from LA Bureau of Sanitation add another $500-$2,000; construction itself dominates.
• Sewer capacity charge: $1,500-$4,000 for a single ADU. Bureau of Sanitation service charge for adding a new dwelling unit. Schedule varies by zone.

Verify lateral capacity early. A plumbing contractor or Bureau of Sanitation site visit can confirm whether your existing lateral has capacity before you commit to ADU placement. This single check can swing your budget by $10K-$15K.

Grading permit fees

Triggered when the project involves moving more than 50 cubic yards of earth, or any grading on hillside parcels regardless of volume.

Grading permit application fee $200 to $500 base.

Grading plan check $500 to $1,500 depending on cubic yardage and slope complexity.

Grading permit issuance $300 to $1,000.

Geotechnical / soils report Not a fee paid to LADBS, but required by LADBS for many hillside projects. $1,500 to $4,000 from a licensed geotechnical engineer.

Total grading-related cost on a hillside ADU project: $1,500 to $4,000 in permit fees plus $1,500 to $4,000 in soils reports, so $3,000 to $8,000 added to the project. See Hillside ADU guide.

Driveway / approach permit (LA Bureau of Engineering)

Triggered when the project requires a new curb cut or modification to an existing driveway approach.

Application fee $200 to $400.

Permit fee $300 to $1,500 depending on approach width and street classification.

Construction itself Concrete driveway approach construction: $3,000 to $8,000, separate from permits. See LA driveway approach permit guide.

What state law preempts (fees you do NOT owe)

California Government Code §65852.2 preempts certain fees on smaller ADUs:

• ADUs at or below 750 sqft: exempt from impact fees (school, park, traffic, etc.). The LAUSD school fee exemption is the biggest dollar value here.
• ADUs converting existing space: exempt from utility connection fees if existing utility connections are reused.
• All ADUs: exempt from new water and sewer connection fees if the connection already serves the primary dwelling and capacity is adequate.

If a city is charging you fees in the preempted categories, push back with a Gov Code §65852.2 citation. The LA Bureau of Sanitation has historically been more aggressive on this than LADBS. Document everything.

Soft costs not paid to government

Outside the fee schedule but real budget items.

Property survey $1,500 to $3,000 from a licensed surveyor. Required for most ADU projects unless a current survey already exists.

Title sheet preparation Often bundled with your designer / architect's fee. $300 to $1,000 standalone.

Disclosure forms Hillside disclosures, fire-zone acknowledgments, scenic-overlay forms, coastal-zone disclosures. Sometimes free, sometimes packaged into designer fees. Budget $200 to $800.

Title 24 energy compliance documentation $300 to $700 from a Title 24 consultant.

HERS rater verification $400 to $900 paid to a certified HERS rater during construction.

Manual J/S/D HVAC calculations Bundled with Title 24 consulting or HVAC contractor design fees.

Construction defect inspections Some lenders require third-party inspections during construction. $300 to $800 each, multiple inspections common.

Full fee example: 500 sqft PRADU on a flat R1 lot

Item	Cost
Building plan check	$2,000
Plumbing sub-permit plan check	$600
Electrical sub-permit plan check	$600
Mechanical sub-permit plan check	$500
Building permit issuance	$5,500
State surcharges (SMI, CBSC)	$200
Records + tech + admin fees	$400
Bureau of Sanitation surcharges	$250
LAUSD school fee (under 750 sqft)	$0
LA RID fee (Council District average)	$1,800
Sewer connection (existing lateral reuse)	$500
Total LA ADU permit fees	$12,350
Property survey	$2,000
Title 24 consulting + HERS rater	$1,200
Total soft costs	$3,200
Grand total (before construction)	$15,550

Construction of the unit itself: $150,000 to $250,000 separately, payable to the contractor and not part of permit fees.

Full fee example: 1,000 sqft custom ADU on a hillside R1 lot

Item	Cost
Building plan check (custom plan, higher valuation)	$3,500
Sub-permit plan check (M/E/P)	$2,000
Fire plan check (hillside often VHFHSZ)	$500
Building permit issuance	$8,500
State surcharges	$400
Records + tech + admin fees	$600
Bureau of Sanitation surcharges	$350
LAUSD school fee ($4.79 × 1,000)	$4,790
LA RID fee	$2,500
Grading permit (hillside)	$2,500
Sewer connection (new lateral)	$8,000
Driveway approach permit	$1,000
Total LA ADU permit fees	$34,640
Property survey	$2,500
Geotechnical / soils report	$3,000
Title 24 consulting + HERS rater	$1,400
Total soft costs	$6,900
Grand total (before construction)	$41,540

This is the difference between a flat-lot under-750-sqft project and a hillside oversize project. The largest swings: school fee (binary trigger at 750 sqft), sewer (binary trigger on new lateral), grading + geotech (hillside-only).

How to minimize fees legitimately

• Stay under 750 sqft to avoid the LAUSD school fee. A 749 sqft ADU saves $3,600+ over a 751 sqft ADU.
• Reuse the existing sewer lateral. Site your ADU close enough to the primary dwelling that the existing lateral has capacity. Check with a plumbing contractor or Bureau of Sanitation before deciding placement.
• Avoid grading. Cut-and-fill on a sloped lot adds permits, soils reports, and engineering. A flat slab on a flat portion of the lot is dramatically cheaper.
• Use a pre-approved plan (PRADU or YOU-ADU). Plan check fees scale with declared valuation and complexity. PRADU and YOU-ADU plans get faster plan check at lower fees because the design is pre-approved.
• Declare valuation accurately. LADBS audits valuations. Under-declared valuations get adjusted upward later, plus penalties.

When fees feel wrong

LADBS occasionally issues fee assessments that exceed what state law allows. Common issues:

• Charging impact fees on under-750-sqft ADUs (preempted by state law)
• Charging full sewer connection fees when the existing connection should be reused
• Adding non-statutory surcharges

If your assessment looks high, request an itemized breakdown from LADBS. Compare each line against state preemptions. Push back in writing with citations. LA city departments have generally complied when challenged with specific Gov Code citations, but you have to do the work.

This guide is updated annually as LA agencies revise their fee schedules. For 2026 fees as of May 2026, all amounts above reflect the most recently published schedules. Always verify the current schedule at dbs.lacity.gov before finalizing your project budget.

Run your address through the PermitPathLA wizard for a fee estimate specific to your lot's overlays, jurisdiction, and project size. The wizard calculates which fee categories apply to your specific situation, including school-fee threshold analysis and sewer-connection routing.