ADU Impact Fees: McKinney vs Plano
How do adu impact fees rules compare between McKinney, TX and Plano, TX?
McKinney and Plano have similar restriction levels.
McKinney, TX
Collin County
McKinney charges standard impact and utility fees on new dwelling units under Texas Local Government Code Chapter 395 authority, including water/wastewater impact fees and roadway impact fees in adopted service areas. There is no Texas statewide ADU impact-fee waiver comparable to California Gov. Code §65852.2(f). Costs depend on whether the unit requires a new utility connection.
View full McKinney rules →Plano, TX
Collin County
Plano charges standard impact and utility fees on new dwelling units under Texas Local Government Code Chapter 395 authority, including water/wastewater impact fees and roadway impact fees in service areas. There is no Texas statewide ADU impact-fee waiver comparable to California Gov. Code §65852.2(f). Costs depend on whether the unit requires a new utility connection.
View full Plano rules →Key Facts Comparison
| Fact | McKinney | Plano |
|---|---|---|
| Authority | TX LGC Ch. 395 Impact Fees | TX LGC Ch. 395 Impact Fees |
| Water Impact | Per adopted CIP - SFE basis | ~$1,500-3,500 per new SFE |
| Wastewater Impact | Per adopted CIP - SFE basis | ~$2,000-4,500 per new SFE |
| Roadway Impact | Applies in service areas | Applies in service areas |
| Share Existing Tap | Avoids most impact fees | Avoids most impact fees |
Highlighted rows indicate differences between cities.
McKinney FAQ
Are ADU impact fees waived in McKinney?
No. Texas has no statewide ADU impact-fee waiver. McKinney charges standard fees under Texas Local Government Code Chapter 395. However, accessory units sharing the principal dwelling's existing water/sewer tap can avoid most impact fees — building, plan-check, and trade permit fees still apply.
Will my property taxes go up after building an accessory unit?
Yes. The Collin Central Appraisal District will reassess the property after the certificate of occupancy. McKinney property taxes combine City of McKinney, Collin County, Collin College, and McKinney ISD levies, typically totaling around 2.0-2.4% of appraised value.
Plano FAQ
Are ADU impact fees waived in Plano?
No. Texas has no statewide ADU impact-fee waiver. Plano charges standard fees under Texas Local Government Code Chapter 395. However, accessory units sharing the principal dwelling's existing water/sewer tap can avoid most impact fees — building, plan-check, and trade permit fees still apply.
What does an accessory unit cost in Plano fees?
Expect $1,500-3,500 in building, plan-check, and trade permit fees for a small unit sharing the main house's utilities. Separate water/sewer connections add $3,500-8,000 in Chapter 395 impact fees plus roadway impact fees if applicable.
Will my property taxes go up?
Yes. The Collin Central Appraisal District will reassess the property after the certificate of occupancy. Plano property taxes are around 0.42% city + Collin County + Plano ISD, totaling roughly 2.0-2.4% of appraised value.
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