Littleton, CO Accessory Structures: ADU Impact Fees (2026)
Key Facts
- ADU impact fee requirement
- Same as any new dwelling unit
- Single-family impact fee total
- $8,389.79 per unit (Table 1-14-3(a))
- Multiple dwelling unit total
- $5,817.13 per unit
- When fee is due
- At building permit issuance
- Governing sections
- ULUC § 10-1-1.7.C.3; Code § 1-14-3
Summary
Every accessory dwelling unit in Littleton must pay the city's land development impact fee and sewer tap fee before a building permit issues, under ULUC § 10-1-1.7.C.3. The citywide impact fee schedule in City Code § 1-14-3 sets the single-family per-unit total at $8,389.79.
A. Land Development Impact Fee Payment: Any person engaged in land development in the City shall pay the land development impact fee described in subsection (B) of this section. ... Use Multimodal Museum Library Police Facilities Transpor- Total ... Single Family $1,055.11 $801.01 $432.80 $2,247.14 $8,389.79 ... 3. Land Development Impact and Sewer Tap Fees. Each dwelling unit requires payment of the city's land development impact and sewer tap fees.
Full Breakdown
3 requires that "each dwelling unit requires payment of the city's land development impact and sewer tap fees," applying the same impact-fee obligation to an ADU that applies to any other new dwelling unit in the city. B assesses it under the rate table in Table 1-14-3(a) for residential development, broken out per unit across categories including multimodal improvements, museum, library, police facilities and transportation. 13 per unit. C, the impact fee is due at the time a building permit is issued unless a development agreement sets an earlier date, and it is charged in addition to any other fee, tax or charge the city or another ordinance requires.
7, an owner adding one must budget for both this citywide land development impact fee and a separate sewer tap fee before the ADU permit is approved.
Violations & Fines
Occupying or receiving a certificate of occupancy for an ADU without first paying the required land development impact fee and sewer tap fee is a permit-compliance violation. Because the fee is a prerequisite to permit issuance under § 1-14-3.C, the Building Division can withhold or revoke permit approval, and unresolved noncompliance is otherwise enforceable under the citywide general penalty, City Code § 1-4-1, with a fine of up to $2,650.
Frequently Asked Questions
Does an ADU have to pay Littleton's land development impact fee?
How much is Littleton's residential land development impact fee?
When is the impact fee due?
Is the sewer tap fee separate from the impact fee?
Sources & Official References
Other rules in Littleton
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