ADU Pass
Springfield
No County portion
Also in: Sangamon County
ADU Pass helps homeowners in Springfield, No County, Illinois navigate the permit paperwork for building an accessory dwelling unit. This area covers 4 ZIP codes.
Map
ADU details
ADU legality: with-restrictions
no_county cross-listing for Springfield IL (Sangamon County seat). Permitting workflow, fees, contacts, climate, building code values are the same as the canonical Sangamon County file. Visitors arriving via no_county routing should treat the Sangamon County profile as authoritative for Springfield IL.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 320 | $1,280 | $70,400 | $71,680 |
| midpoint | 575 | $2,050 | $155,250 | $157,300 |
| maximum | 900 | $2,900 | $270,000 | $272,900 |
Fee breakdown (as of 2026-04)
Permitting process
- Confirm county routing - Springfield IL is in Sangamon County
no_county visitors should first confirm they want the Illinois Springfield (Sangamon, state capital) and not Springfield, MO (Greene County), Springfield, MA (Hampden County), Springfield, OR (Lane County), or Springfield, OH (Clark County). Then proceed to the Sangamon County canonical entry. - Pre-application meeting - Office of Planning & Economic Development (~7d)
Same as canonical entry. Counter at Municipal Center West, 800 E Monroe Street. Confirm zoning district and Lincoln Home / Aristocracy Hill / Enos Park / Bunn Capitol overlay applicability. - CUP / SUP application + accessory-use review (~35d)
Same as canonical: filed with Springfield Planning & Zoning Commission, 250-ft neighbor notification, twice-monthly meetings. - Lincoln Home historic / Aristocracy Hill COA (when applicable) (~45d)
Same as canonical. Section 106 federal review through Illinois SHPO if any federal funding nexus (HUD, USDA, federal historic tax credit). - Building permit submittal - Office of Public Works (~5d)
Same as canonical: 300 S Seventh Street counter intake or email submission. - Plan review (Building, Fire, Public Works, CWLP) (~30d)
Same as canonical: 4-division concurrent review, CWLP municipal-utility coordination unique to Springfield IL. - Permit issuance, inspections, Certificate of Occupancy (~15d)
Same flow as canonical Sangamon entry; final inspection issues CO before legal occupancy/rental.
Viability (permitted uses)
- Long-term rental: yes Permitted; rental-property registration may apply.
- Short-term rental: with-restrictions (Springfield business license + Illinois Hotel Operators Tax (canonical)) Lincoln tourism + General Assembly session weeks drive STR demand.
- Office rental: no Section 155.032 limits ADU to dwelling use.
- Home office: yes Home occupation permitted with restrictions.
- Studio / workshop: yes Personal artist/workshop is a permitted accessory use.
- Agriculture: with-restrictions Backyard chickens permitted; no livestock.
- Relative support: yes Multigenerational ADU explicitly contemplated.
Incentives
- Illinois Property Tax Assessment Freeze (canonical) — 8-year frozen assessment (Owner-occupied historic-district properties)
Contacts
Staff: ADU Pass internal routing (Use Sangamon County entry as authoritative source), Office of Planning & Economic Development (Zoning + CUP intake)
Utilities
- Water: City Water, Light & Power (CWLP) - municipal (canonical) · 21d connect · $2,900
- Sewer: Springfield Metropolitan Sanitary District (canonical) · 28d connect · $4,400
- Electric: City Water, Light & Power (CWLP) - municipal (canonical) · 28d connect · $1,450
- Gas: Ameren Illinois natural gas (canonical) · 30d connect · $1,300
Property values & taxes
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 320 | $740/mo |
| 575 | $985/mo |
| 900 | $1,265/mo |
Construction timeline
Realistic total: best 8mo · typical 12mo · worst 18mo
Mirrors canonical entry.
Modular pathway Illinois Manufactured Building Program (canonical) · inspectors are occasional with modular · 2 modular permits (last 24mo)
Mirrors canonical: downtown narrow alleys limit module width to 12 ft on rear-yard deliveries.
Financing
State ADU loans:
- IHDA Smart Move Mortgage (canonical) (Illinois Housing Development Authority)
- Federal Historic Tax Credit (20%) - Lincoln Home district eligible (IRS / NPS via Illinois SHPO)
Insurance impact
Mirrors canonical entry.
HOA prevalence & preemption
Mirrors canonical entry.
Regulatory overlays (3)
- historic-district — Federal Lincoln Home NHS + city Aristocracy Hill / Enos Park / Bunn Capitol / Vinegar Hill (canonical) · +45d · +14% cost
Cross-listing visitors should not assume by-right ADU - federal Section 106 review applies in LIHO area. (map) - flood-zone — FEMA SFHA along Spring Creek and Sugar Creek (canonical) · +21d · +9% cost
Mirrors canonical entry. (map) - tornado-zone — Central IL Tornado Alley (canonical) · +2% cost
Mirrors canonical entry. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Springfield Title XVII Chapter 170 local amendments (canonical) — Springfield-specific IRC amendments.
- Illinois Plumbing Code (77 Ill Adm Code 890) — Mandatory; supersedes IPC.
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Springfield Code of Ordinances Title XV Chapter 155 (Zoning) - canonical via Sangamon entry, adopted 1980-01-01, last amended 2024-04-01
- 1971-12-15 — Lincoln Home National Historic Site established (Public Law 92-127) - cross-reference (federal-law)
Federal designation of Lincoln Home neighborhood; relevant to no_county visitors who may not realize Springfield IL is heavily historic-overlay regulated.
Effect: Section 106 federal review applies in 8th & Jackson area for any federal-nexus project. - 2025-01-01 — no_county routing fallback for Springfield IL (other)
ADU Pass site convention: every state has a no_county bucket so URL patterns missing a county slug still resolve. For Springfield IL, this file points to the Sangamon County canonical entry.
Effect: Internal routing only; no legal effect on permitting.
Known issues (1)
- routing (since 2025-01) — This is a routing-fallback duplicate of the canonical Sangamon County Springfield entry. Use the Sangamon entry as authoritative. (source)
County: no attribution (synthetic bucket)
No county
This city sits in the state's "no county" bucket — its ADU rules derive directly from state law and city ordinance without a county intermediary. No county-level sections apply.
Illinois state — ADU law and programs
State financing programs
Illinois does not operate an ADU-specific statewide loan, grant, or forgivable-loan program. The Illinois Housing Development Authority (IHDA) is the state's housing finance agency and administers a robust portfolio of homebuyer products: Access Forgivable, Access Deferred, Access Repayable down-payment-assistance variants, the IHDA Mortgage first-mortgage product, and the federal Low-Income Housing Tax Credit allocation. The 2025 IHDA Access Home program offers DPA equal to 6% of purchase price up to $15,000. None target ADU construction directly; an ADU-bearing primary residence on an Illinois lot can qualify for the underlying mortgage when other criteria are met.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Codes
- 62705
- 62708
- 62791
- 62794
Post Office
- 1760 Wabash Ave, 62704
- 1903 W Monroe St, 62704
- 1927 E Sangamon Ave, 62702
- 2105 E Cook St, 62703
- 401 S Spring St, 62706
- 411 E Monroe St, 62701