Building permits, zoning and septic rules in Amboy, Illinois

At a glance

Building permit

Required inside Amboy city limits; filed with the city building inspector¹

Zoning

The city publishes its own zoning ordinance with residence, commercial, service, industrial and conservation districts⁵

Building code

2015 International Building Code with local amendments⁶

Septic

Lee County Health Department issues private sewage permits in Lee County; city-sewer status of a given lot is unconfirmed³

RV living

Travel and camping trailers may not be occupied as a dwelling except in lawfully established mobile home parks or tourist camps⁷

Mobile homes

Not permanently affixed to a lot except in an approved mobile home subdivision or planned development⁸

Floodplain

Buildings in the floodplain must be protected to base flood plus 1 foot⁹

Property tax (Lee County)

Effective rate of 1.9%; median bill $2,980 a year¹⁰¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 17, 2026.

Do you need a building permit in Amboy, Illinois?

Yes. Inside Amboy city limits, the city code makes it unlawful to construct, add to, alter, remove or demolish a building or structure without first filing a written application with the building inspector and obtaining a building permit¹. The same section covers installing equipment for the operation of a building¹.

The city builds on the 2015 International Building Code with local amendments, and detached one- and two-family dwellings are also governed by the 1995 CABO One and Two Family Dwelling Code⁶. The city amended the IBC's section 105.2 square-foot reference to 144 square feet, so ask the building inspector whether a small shed or similar structure needs a permit¹.

Once permitted, the building inspector makes the inspections needed to enforce the building chapter¹². Applying after a violation notice costs two times the fee¹.

Who issues building permits in Amboy, and how do you reach them?

The City of Amboy issues its own building permits through the city building inspector, not Lee County¹³. The city's contact page lists a Building & Zoning number of (815) 973-0405 and City Hall at 227 E. Main St. in Amboy².

The application can come from the owner, a lessee or an agent, or from a licensed engineer or architect, and plans go in duplicate, signed by the owner and sealed by any architect or engineer¹³. No permit is issued until the plans are approved and fees are paid, and the permit must be posted where it is visible from the street during construction¹³.

A permit is valid for no more than 6 months (3 months for a porch, roof, siding or fence) unless extended for good cause¹. We could not confirm the city's fee schedule, so ask the Building & Zoning line for current fees.

Does Amboy have zoning, and what does it mean for lot size?

Yes. The City of Amboy publishes its own zoning ordinance, which sorts the city into residence, commercial, service, industrial and conservation districts⁵. The residence districts run from single-family to general and multiple-family⁵.

In the ordinance's single-family residence district, each lot needs a minimum lot area of 7,500 square feet⁵. Other districts have their own lot, yard and height rules, and we could not confirm minimum dwelling size, accessory dwellings or tiny-home rules, so ask the Building & Zoning line which district a parcel sits in before you buy².

Lee County's separate zoning code covers only the unincorporated area, so county rules such as its 2-acre AG-1 residential minimum do not apply inside Amboy¹⁴. For land outside city limits, see the Lee County page.

How do septic permits and wells work in Amboy?

The Lee County Health Department issues permits and conducts inspections for private sewage disposal systems installed in Lee County, and it issues permits for all new wells³⁴. Systems must follow both Lee County and Illinois State Private Sewage Codes¹⁵. The department's Environmental Health office is at 309 S. Galena Ave., Ste. 100, in Dixon¹⁶.

A potable well permit costs $175, including inspection and water sampling; a non-potable well permit costs $150; and a well upgrade or seal permit costs $100⁴. Well applications must be filed before the building permit from the Lee County Zoning Office, which covers county land⁴.

We could not confirm whether a particular lot inside Amboy must connect to city sewer or water, or how off-grid sanitation is treated. Ask City Hall at (815) 857-3814 and the health department before you plan a septic field on a city lot².

Can you live in an RV, tiny home or mobile home in Amboy?

Not on an ordinary lot. Amboy's code says mobile homes, travel trailers and camping trailers may not be occupied for dwelling purposes except in lawfully established mobile home parks or tourist camps⁷. In a residence district, one travel or camper trailer may be stored, not occupied, in an enclosed structure or a back or side yard, but not in a front yard⁷. A temporary construction-office trailer needs a permit from the building inspector⁷.

Mobile homes also cannot be permanently affixed to the ground as a principal or accessory structure in any district except in an approved mobile home subdivision or a planned development⁸. Modular homes on a foundation are defined separately and are not restricted by that section⁸.

The city code we reviewed has no tiny-home provision, so we could not confirm how a tiny home is treated. Ask the Building & Zoning line before buying².

Building a home in Amboy: the steps, in order

1. Call the City of Amboy Building & Zoning line at (815) 973-0405 and confirm the parcel's zoning district and lot-area rule².
2. Check the floodplain: buildings there must be protected to the flood protection elevation, which is base flood plus 1 foot of freeboard⁹.
3. Ask City Hall and the Lee County Health Department whether the lot uses city utilities or needs a septic system and a well¹⁶.
4. If a well is needed, file the Lee County Health Department well application⁴.
5. File a written building permit application with plans in duplicate with the city building inspector, and pay fees before the permit issues¹³.
6. Post the permit where the street can see it and build within the permit's term, 6 months at most unless extended¹.
7. Schedule the inspections the building inspector requires¹².

What stays with Lee County, and what to check before you buy in Amboy?

Septic permits and well permits come from the Lee County Health Department, not the city³⁴. Outside city limits, building permits come from the Lee County Building and Zoning Office instead of the City of Amboy¹⁷. If a parcel is not clearly inside the city limit, confirm which office has jurisdiction before you sign.

Check the floodplain first: the city requires floodplain protection for buildings⁹. Taxes matter too. Lee County's effective property tax rate is 1.9%, and its median property tax bill is $2,980 a year¹⁰¹¹. The county's typical home value is $190,606¹⁸.

Watch-outs

• We could not confirm Amboy's building permit fees, so ask the Building & Zoning line at (815) 973-0405 for the current schedule².
• We could not confirm whether a lot inside Amboy must use city sewer or water, or who regulates a septic system on a city lot, so ask City Hall and the Lee County Health Department¹⁶.
• Camping or living in a travel trailer on an Amboy lot is limited to lawfully established mobile home parks or tourist camps, and trailers lawfully in the city before Ordinance 1-13-92A cannot be replaced if removed or if the property is transferred⁷.
• A buyer of land near Amboy should confirm whether the parcel is inside city limits, because county rules apply only outside them¹⁷.

Sources

1. Amboy Code Sec. 18-1 Permit required for certain activities (Amboy), quoted and re-checked
2. City of Amboy, Building and Zoning (City Hall) (cityofamboy.com)
3. Environmental Health | Lee County Health Department, quoted and re-checked
4. Lee County Health Department Well Permit Application Packet, quoted and re-checked
5. City of Amboy zoning ordinance (cityofamboy.com)
6. Amboy Code Sec. 18-36 Adoption of International Building Code, 2015 Edition (Amboy), quoted and re-checked
7. Amboy Code Sec. 46-32 Regulations (mobile homes, travel trailers) (Amboy), quoted and re-checked
8. Amboy Code Sec. 46-32 Regulations (mobile homes, travel trailers) (Amboy), quoted and re-checked
9. Amboy Code Sec. 38-7 Protecting buildings (Amboy), quoted and re-checked
10. Effective property tax rate: Bolthole Index county data
11. Median property tax bill: Bolthole Index county data
12. Amboy Code Sec. 18-1 Permit required for certain activities (Amboy), quoted and re-checked
13. Amboy Code Sec. 18-1 Permit required for certain activities (Amboy), quoted and re-checked
14. 10-1-3: Purpose, quoted and re-checked
15. Environmental Health | Lee County Health Department, quoted and re-checked
16. Lee County Health Department, Environmental Health (lchd.com)
17. Building Permits | Lee County, IL, quoted and re-checked
18. Typical home value (Zillow): Bolthole Index county data

Written October 17, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.