Bolthole Index

Carroll County, Illinois

Zoning, building permits and septic rules in Lanark, Illinois

Lanark, Illinois, in Carroll County, has its own zoning code and requires a city building permit for work costing over $1,000 that changes a building's footprint12. Inside city limits the city, not the county, handles both. Septic and well questions for a Lanark address are not covered by the city rules we found; ask the Carroll County Health Department3.

At a glance

Building permit
Required inside Lanark for work over $1,000 that changes a building's footprint; issued by the city2
Zoning
Lanark's own Chapter 10 zoning code applies inside city limits1
Permit fee
$25 base for work under $10,000, plus $10 per additional $10,000 of value4
Minimum home size
950 square feet of gross floor area for a dwelling5
Mobile homes
No permits for a single mobile home in the R1 and R2 districts6
Septic
Not confirmed inside city limits; Carroll County Health Department handles private sewage inspections3

Who to call

Building permits

City of Lanark (city clerk or police chief; Zoning Officer)

Building permit applications and zoning inside Lanark city limits

Septic permits

Carroll County Health Department

Environmental-health inspections of water wells and private sewage disposal

(815) 244-8855

[email protected]

822 South Mill Street, Mt. Carroll, IL 61053

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Lanark means bringing your own water and power. The kit we’d start with:

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Does Lanark, Illinois have zoning?

Yes. Lanark has its own Chapter 10 zoning ordinance, and county zoning does not govern land inside city limits1. The districts are Agricultural, R1 Low Density Residence, R2 Medium Density Residence, C1 Highway/Auto Commerce, C2 Downtown Commerce, C3 Mixed Residential and Commercial, and Industry7.

One rule applies citywide: a dwelling in Lanark must have at least 950 square feet of gross floor area5. A tiny home under that size is therefore a poor fit for a primary residence; we could not confirm whether the city treats tiny homes differently, so ask city hall before buying.

For manufactured housing, Lanark allows sectional manufactured homes on any site permitted for other residences if they are at least 20 feet long and 20 feet wide and sit on a permanent foundation8. A single mobile home gets no permits of any type in the R1 and R2 districts6. We could not confirm lot sizes, setbacks for houses, or building heights by district, so request the district schedule for your parcel.

Do you need a building permit in Lanark, and who issues it?

The City of Lanark issues building permits inside city limits, not Carroll County. A permit is required before construction, reconstruction or alteration of a building when the work costs more than $1,000 in combined materials and labor and changes the footprint of the existing structures2. The listed triggers include a new building, an addition, a change of use, any fence or retaining wall, an inground pool, and a new cement or blacktop driveway29.

Interior remodeling, siding, window and door replacement, and ordinary repairs are exempt, as are fences and garden walls four feet or lower2. Exempt work still has to meet zoning and setback rules2.

The application is returned to the city clerk or police chief10. Fees start at $25 for work valued under $10,000, plus $10 for each additional $10,000 of value, and work started without a permit costs twice the normal fee4.

How do septic permits work inside Lanark?

We could not confirm whether a Lanark address is on city sewer or may use a private septic system; we did not find the city's sewer-connection rule. Call Lanark city hall to ask whether your lot must connect to public sewer.

If a private system is allowed, the Carroll County Health Department conducts environmental-health inspections of private sewage disposal and water wells11. Illinois requires a permit to build a new private sewage disposal system12 and a permit for a new water well13. The city's building permit does not replace either. Soils vary by lot: about 54% of Carroll County soils are rated not limited for a conventional drain field, so a site evaluation is still wise14.

Can you live in an RV or tiny home in Lanark?

We could not confirm Lanark's rules for living in an RV or camping on private land inside city limits; the city's district use lists were not available to us. Ask the city zoning officer at Lanark city hall before parking a home RV on a lot.

Do not rely on Carroll County's RV rule. The county's rule that no RV may serve as a residence applies only to unincorporated land15, and inside Lanark the city's zoning controls instead1. For tiny homes, the city's 950 square foot dwelling minimum applies to any dwelling5.

Building a home in Lanark: the steps, in order

  1. Ask Lanark city hall which zoning district your parcel is in and whether the lot is on city water and sewer7.
  2. Confirm the home meets the 950 square foot minimum5.
  3. If private septic or a well is allowed, contact the Carroll County Health Department for those permits1112.
  4. Submit the building permit application to the city clerk or police chief10; the police chief may inspect the site and approve, conditionally approve, deny, or refer the request to council16.
  5. Pay the fee under the city schedule4.
  6. Ask the city whether inspections or an occupancy certificate apply; we could not confirm either.

What stays with Carroll County, and what to check before you buy

Land outside Lanark city limits is governed by Carroll County, which has separate zoning and building permit rules for unincorporated land; see the Carroll County page for those answers17. Floodplain rules also matter: Carroll County requires its floodplain regulation to be met before a structure is permitted on land subject to flooding18.

County-level figures: Carroll County's effective property tax rate is about 2%19, and the median property tax bill is about $2,308 a year20. Confirm the boundary of city limits with the Carroll County Zoning & Building office before relying on any rule here.

Watch-outs

  • The city's code is posted on American Legal Publishing with a disclaimer that it may not reflect the most recent legislation, so confirm current rules with Lanark city hall1.
  • Septic, well, sewer connection, building code adoption, inspections, occupancy certificates, RV rules, lot sizes and setbacks inside Lanark were not confirmed; call city hall and the Carroll County Health Department11.
  • Work that needs no permit still must follow zoning and setback requirements2.

Sources

  1. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  2. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  3. carrollcountyil.gov, quoted and re-checked
  4. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  5. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  6. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  7. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  8. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  9. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  10. City of Lanark (city clerk or police chief; Zoning Officer) (codelibrary.amlegal.com)
  11. Carroll County Health Department (carrollcountyil.gov)
  12. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  13. 77 Ill. Admin. Code 920.130, Water Well Permit Requirements (Illinois statewide rule), quoted and re-checked
  14. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  15. Chapter 700 Zoning Amended 05.18.2023, quoted and re-checked
  16. Lanark Code Chapter 10 Zoning: 10-11-6 Minimum dwelling size, 10-13-1 Permits (with table of contents) (Lanark), quoted and re-checked
  17. Applications & Support Documents, quoted and re-checked
  18. Chapter 700 Zoning Amended 05.18.2023, quoted and re-checked
  19. Effective property tax rate: Bolthole Index county data
  20. Median property tax bill: Bolthole Index county data

Written October 24, 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.

Answers from the rulebook for Lanark

Lanark’s own rules

  • Building permitRequired

    New construction, reconstruction or alteration of buildings inside Lanark city limits whose estimated cost exceeds $1,000 and that changes the footprint of an existing structure

    • Permit issued by the city, not the county; application goes to the city clerk or police chief under 10-13-1(d); the permit form is issued by the Office of the Zoning Officer.
    • Listed instances requiring a permit include construction of a new building structure, a new addition, change of use, any fence or retaining wall, an inground swimming pool, a new cement or blacktop driveway, and freestanding solar panels or attachments that change footprint.
    • Exemptions with no permit required even above $1,000 include interior remodeling, siding/windows/doors replacement, ordinary structural repairs, and garden or retaining walls and fences that are four feet (4') or less in height.
    • Work with no permit still must comply with zoning and setback requirements.

    estimated cost threshold for permit: > 1000 USD (combined materials and labor; labor of homeowner and friends valued as if obtained from a contractor; footprint change required)

    “a permit shall be required prior to any construction, reconstruction or alteration of a building where the estimated cost for such work exceeds one thousand dollars ($1000) in combined materials and labor, and the construction, reconstruction or alteration changes the footprint of existing structures.”
  • Local zoningPresent (with conditions)

    Land inside Lanark city limits. Lanark city's own Chapter 10 Zoning ordinance applies; county zoning does not govern land inside city limits.

    • Chapter 10 Zoning is in the city code, with articles for zoning districts and map, Agricultural (A), R1 Low Density Residence, R2 Medium Density Residence, C1, C2, C3, Industry, district lot regulations, special regulations, nonconforming uses, administration and fences.
    • The code is posted on American Legal Publishing and the city's own disclaimer says it may not reflect the most recent legislation; the official printed code should be consulted.
    “article 3 zoning districts and map article 4 a agricultural article 5 r1 low density residence”
  • Zoning districtsPublished

    Zoning districts of Lanark city (Chapter 10 Article 3 zoning districts and map)

    • Districts named in the table of contents: Article 4 A Agricultural, Article 5 R1 Low Density Residence, Article 6 R2 Medium Density Residence, Article 7 C1 Highway/Auto Commerce, Article 8 C2 Downtown Commerce, Article 8a C3 Mixed Residential and Commercial, Article 9 I Industry.
    • The district map and the district schedules themselves were not opened.
    “article 3 zoning districts and map article 4 a agricultural article 5 r1 low density residence article 6 r2 medium density residence article 7 c1 highway/auto commerce article 8 c2 downtown commerce article 8a c3 mixed residential and commercial section article 9 i industry”
  • Minimum dwelling sizeSpecified

    Dwellings inside Lanark city limits (citywide; not varied by district in the section read)

    • Applies to the gross floor area of any dwelling in the city.

    minimum gross floor area for a dwelling: >= 950 square feet

    “the minimum gross floor area for a dwelling shall be nine hundred fifty (950) square feet.”
  • SetbacksSpecified

    Fences only (not principal building setbacks) on lots inside Lanark city limits that border an alley

    • Fences up to eight feet on sides and rear; four feet maximum in front (10-14-3 b.).
    • Setback applies to fence placement only; where no alley borders the property, no rear setback is required.
    • On corner lots, all portions abutting a street are treated as front yard for fence setbacks and fence heights.

    fence setback from rear lot line when lot borders an alley: 5 feet (only where the property borders an alley)

    “further, there shall be a setback requirement on the rear of the property of five feet (5') if the property borders an alley.”
  • Manufactured homesAllowed (with conditions)

    Manufactured sectional homes inside Lanark city limits, on any site permitted for other residences

    • Minimum length 20 feet and minimum width 20 feet.
    • If delivered on wheels, the wheels, axles and suspension must be permanently removed.
    • Must be placed on a permanent concrete foundation with an enclosed basement or a permanent cement slab foundation.
    • Such homes are not treated as mobile homes under the city mobile home rules when these standards are met.

    minimum length: >= 20 feet · minimum width: >= 20 feet

    “resident structures which are commonly referred to as manufactured sectional homes will not be restricted under the provisions of the mobile home ordinance of the city and may be placed on all sites that are permissible for all other types of residences provided they meet the following standards:”
    One more reviewed finding on this topic
  • Driveway accessRequired

    Construction of a new cement or blacktop driveway inside Lanark city limits

    • Listed under the instances in 10-13-1(a) where a building permit is required.
    • Curb-cut, access width and driveway placement standards were not located in the code and were not reviewed.
    “6. the construction of any new cement or blacktop driveway.”
  • Permit feesPublished (with conditions)

    Building permit fees for construction in Lanark city limits

    • A permit to tear down or remove a structure (demolition) is issued without a fee.
    • Where a variance or special use permit fee was paid first, the normal building permit fee is still charged.
    • A late permit (work begun without a permit) costs twice the normal fee.
    • Values are rounded to the nearest $10,000 for fee calculation.
    • The permit form on the city site has a blank fee line, so the code schedule governs.

    base building permit fee: 25 USD (construction or reconstruction valued less than $10,000) · additional fee per $10,000 of value: per 10 USD (added for every additional $10,000.00 of value)

    “$25.00 for constructions or reconstructions valued less than $10,000.00. an additional fee of $10.00 is added for every additional $10,000.00 of value.”
  • Permit processPublished (with conditions)

    Building permit application process inside Lanark city limits

    • Application goes to the city clerk or police chief under 10-13-1(d); the police chief may inspect the site and approve, conditionally approve, deny, or refer to council.
    • Application exhibits include a boundary survey extending 100 feet beyond the property and a plot plan with utility plan; the police chief may waive them.
    • A permit is valid for one year from issue; extensions may be granted by the police chief or council.
    • Violations require a late permit within ten days of notice; fines from $10 to $500 per occurrence.
    • Discrepancy: the code names the city clerk or police chief, while the city permit form is issued by the Office of the Zoning Officer at 111 S. Broad St. Suite C.
    “if a permit is required, an application shall be filled out and returned to the city clerk or police chief.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Lanark or Carroll County directly.

  • Owner-builder exemption — Owner-builder construction inside Lanark city limits
  • Building code adopted — Building construction inside Lanark city limits
  • Inspections — Building inspections inside Lanark city limits
  • Certificate of occupancy — Certificates of occupancy inside Lanark city limits
  • Minimum lot size — Minimum lot area for single-family residential districts (R1, R2) inside Lanark city limits
15 more unanswered
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Lanark publishes no rule on the point, not that none exists. Carroll County’s page lists the county offices to call.

← All of Carroll County: county rules, score and offices