Building permits, zoning and septic rules in Hawthorn Woods, Illinois

At a glance

Building permit

Required from the village Building Department¹

Zoning

Village zoning code, run by the Planning Department²

Septic

Layout approval from Lake County Health Department before the village permit³

Wells

Lake County Health Department approval for private wells⁴

Minimum home size

1,700 sq ft one story, 2,200 sq ft two story⁵

Owner-builder

Homeowners building their own home must register as contractors⁶

Contractor registration

$175 per year¹

Who to call

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

Do you need a building permit in Hawthorn Woods, Illinois?

Yes. Inside Hawthorn Woods village limits, new homes and alterations of structures need a village building permit, and construction may proceed only after the permit is issued¹. The application needs a completed form, two complete sets of plans and two plats of survey, among other items on the village checklist¹.

The village has adopted the 2018 International Residential Code, the 2018 International Building Code and related codes, with local amendments in village code section 8-1-1⁷. Hawthorn Woods standard plan review and permit issuance takes 20 business days, not counting delays for incomplete submittals⁸.

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

The Village of Hawthorn Woods Building Department, at Village Hall, 2 Lagoon Drive, issues building permits, reviews plans and coordinates inspections⁸. Applications can be emailed to permits@vhw.org⁸. Building permits for land inside the village do not come from Lake County; the county's Planning, Building and Development office serves unincorporated land only, so see the Lake County page for property outside village limits.

Contractors and subcontractors working under a building permit must register with the village, and the village treats a homeowner who builds or alters their own home as a contractor, so owner-builders register too; the registration is $175 annually⁶¹.

Does Hawthorn Woods have zoning, and what does it mean for RVs, tiny homes and lot size?

Yes. Hawthorn Woods has its own village zoning code, administered by the village Planning Department²⁹. The Planning Department page names minimum lot area, lot width, lot coverage, building height and setbacks as the code's bulk and yard requirements, but we could not confirm the numbers for each district, or the rules on RV living, tiny homes, accessory dwellings or short-term rentals. Ask the Planning Department before you buy.

One size rule is confirmed: the village permit guide gives minimum floor areas of 1,700 square feet for a one-story home and 2,200 square feet for a two-story home⁵. Subdivision covenants may require more⁵.

How do septic permits work inside Hawthorn Woods?

The Lake County Health Department, not the village, handles septic approval for Hawthorn Woods homes that are not on public sewer¹⁰. A new home on a private septic system needs county approval of the septic layout before the village building permit is submitted³. Septic installation or replacement may also need a Lake County site development permit¹⁰.

Lake County's soils matter here: the share of county soils rated not limited for a conventional drain field is 0%¹¹, so expect a site evaluation and possibly an engineered system. Private wells also need county health department approval⁴. Call the department at 847-377-8020¹².

Building a home in Hawthorn Woods: the steps, in order

1. Confirm the lot's zoning district and any subdivision covenants with the Planning Department⁹⁵.
2. If the lot is on private septic or a well, get Lake County Health Department approval of the septic layout and well first³⁴.
3. Register your contractors, or yourself if you build your own home, with the village; the fee is $175 annually¹.
4. Submit the permit application, two sets of plans and two plats of survey to the Building Department¹.
5. Collect the fire department, school district and library contribution receipts; those fees are paid to each body directly¹³.
6. Allow 20 business days for plan review, then build⁸.

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

Septic and well approval stay with the Lake County Health Department even inside the village¹⁰. The village guide also says a storm sewer connection may be required under village code¹. Lake County's effective property tax rate is 2.7%¹⁴, and the typical home value is $400,964¹⁵, so check the tax bill before you commit.

Watch-outs

• We could not confirm Hawthorn Woods's permit fee schedule, inspection schedule, certificate of occupancy rules, floodplain rules or driveway rules; ask the Building Department at permits@vhw.org⁸.
• We could not confirm the zoning districts, setbacks, minimum lot size or whether RVs, tiny homes or accessory dwellings are allowed; ask the Planning Department before you buy⁹.
• Fire department, school district and library contribution fees are paid directly to each body, not to the village¹³.

Sources

1. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
2. Village of Hawthorn Woods Planning Department (Village of Hawthorn Woods), quoted and re-checked
3. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
4. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
5. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
6. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
7. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
8. Village of Hawthorn Woods Building Department (vhw.org)
9. Village of Hawthorn Woods Planning Department (vhw.org)
10. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
11. 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
12. Lake County Health Department — Onsite Wastewater Treatment System (lakecountyil.gov)
13. Village of Hawthorn Woods Building Department permit procedures - new home construction requirements (rev. 10/10/25) (Village of Hawthorn Woods), quoted and re-checked
14. Effective property tax rate: Bolthole Index county data
15. Typical home value (Zillow): 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.