Illinois hands spec builders two very different playbooks depending on which side of the city line they buy. Inside Chicago, the Department of Buildings controls your start date and floor-area ratio controls your building envelope; out in the collar counties, plan review is fast but a stack of impact and land-cash fees can add five figures per lot before you pour footings. This guide is for investors and builders financing ground-up, non-owner-occupied spec and build-to-rent homes across Chicago and the collar counties (DuPage, Will, Kane, Lake, McHenry) and Naperville. It explains how Jaken Finance Group structures new-construction capital here, and where the city-versus-collar contrast changes how a loan should be sized.
We keep the generic loan mechanics brief and link out — see how construction loans work and ground-up loans with no experience for the draw-by-draw fundamentals. The depth below is Illinois-specific: permit authority, plan-review timelines, FAR caps, GC licensing traps, dollar-figure fee schedules, cost per square foot, submarkets, winter carry, and two worked pro formas. This is educational information, not legal or tax advice.
Why build spec in Illinois in 2026
The metro’s spec thesis is a land-and-vintage story. Chicago’s north-side and inner-collar neighborhoods are full of 1900s-1950s housing stock on lots worth more than the buildings on them, which is exactly the setup that rewards teardown-rebuild. Buyers pay a premium for a new envelope — modern MEP, open plans, deep basements, energy code — that a gut rehab cannot fully replicate. On the collar side, large-lot suburbs like Naperville and Hinsdale support move-up and custom product where finished value clears build cost by a comfortable margin.
The financing question is where your dollars sit. On prime north-side Chicago blocks and in Hinsdale, land can be 40%-60%+ of finished value, so the loan is really a land-plus-carry facility with a thin vertical. On the northwest-side bungalow belt and outer-collar production markets, construction cost dominates and the loan looks like a classic cost-based build. Getting that mix right is the difference between a deal that pencils and one that stalls. For broader context, see the Illinois market report and the Chicago infill teardown economics breakdown.
How ground-up spec financing works here
We will not re-explain draw mechanics at length — the construction loan guide and the new-construction investment property guide cover that. In short, Jaken Finance Group underwrites the total project cost (land + hard costs + soft costs + contingency), advances against it during construction, and either sells out or refinances into a rental loan at completion. The Illinois-specific settings:
| Parameter | Jaken Finance Group setting | Illinois note |
|---|---|---|
| Construction/bridge rate | 8.99%-13.5% interest-only on drawn balance | Priced to sponsor and file strength |
| Term | 12-18 months interest-only (extensions available) | Build-to-rent verticals can run 12-24 months |
| LTC — general investor | Up to 90% LTC | Match to sponsor experience |
| LTC — qualified files | Up to 100% LTC on qualified files | Strongest borrowers/lowest-basis deals |
| LTC — spec/BTR builder | 70%-80% LTC | Repeat builders |
| LTC — first-timer | 65%-75% of cost | Pair with no-experience program |
| As-completed cap | Up to 75% LTARV | We fund the lower of LTC and LTARV |
| Contingency | 10%-15% of hard-cost budget | Chicago frost/winter risk argues for the high end |
| Interest reserve | 2-6 months, higher for winter carry | Justified below for Q4-Q1 Chicago starts |
| Draws | 5-7 on a $500K+ vertical | Fund 48-72 hours after third-party inspection |
| Close speed | 10-14 business days | Construction files |
| DSCR takeout | 5.75%-10.5% at 1.0+ DSCR, 70%-75% LTV | Build-to-rent permanent exit |
Two rules carry most of the underwriting weight. First, we fund the lower of LTC and LTARV — on a land-basis-dominated north-side teardown, the 75% LTARV cap usually binds before the LTC cap, so a seven-figure lot does not automatically translate into a seven-figure advance. Second, we never front-load more than 20% of the budget before the foundation inspection, and draws release 48-72 hours after a third-party inspector signs off. That draw discipline matters more in Illinois than in warm-weather states because the foundation draw often lands in winter (see interest reserve below).
Land and lot acquisition
Most spec deals here start with a lot or a teardown, not a vacant subdivision parcel. Jaken Finance Group can finance the land acquisition and roll it into the construction facility so land equity counts toward your cost basis rather than sitting trapped. See vacant land and raw land financing for standalone lot loans and bridge loans in Illinois for teardown acquisitions where you need to close fast and demolish before permits are in hand.
The land-basis spread is wide. Established-neighborhood suburban lots run roughly $50,000-$200,000; premium North Shore lots clear $300,000+; and prime north-side Chicago teardown lots on desirable blocks routinely reach seven figures. Underwrite the lot as what it is — the dominant risk on a teardown deal, the smaller line on a production build.
One Illinois wrinkle on teardowns: in Chicago a wrecking/demolition permit is its own DOB workflow with utility disconnect sign-offs, and Cook County records the demolition before your new-construction permit issues, so budget a few weeks of dead carry between demolition and vertical start. On the collar side, a teardown on an already-platted lot skips the plat process but still faces the municipal donation and impact fees at building-permit stage. Sequence the land loan so demolition and site clearing are funded before the construction facility converts, and confirm the utility disconnect timeline with the municipality before you close — a stalled gas or water disconnect can idle a lot for a month.
Permit authority and plan-review timeline
Chicago — Department of Buildings (DOB), E-Plan / ProjectDox. After you open a permit application in the Dynamic Portal, licensed design professionals upload drawings through ProjectDox (E-Plan) for review. DOB runs several review tracks; for a ground-up spec house the relevant ones are Standard Plan Review, Self-Certification, and (for large/complex jobs only) Developer Services.
- Standard Plan Review (SPR) is the default for new low-rise residential requiring drawings. DOB’s published target is issuance within 53 days; practitioner guides put real-world SPR at roughly 7-9 weeks, with extra cycles on complex jobs.
- Self-Certification lets an Illinois-licensed architect or structural engineer who has completed DOB training take responsibility for code compliance and compress the review queue. This is the main lever a Chicago spec builder pulls to shorten DOB time.
- Developer Services is for high-rises over 80 feet, structures over 150,000 square feet, or deep foundations — i.e., generally not single-family spec.
Collar/suburban — materially faster. In Naperville, a new single-family home is typically reviewed in three to four weeks (longer in peak season). That is the central city-versus-collar timing point: the same spec house clears plan review roughly 2-3x faster in a collar municipality than under Chicago DOB Standard Plan Review. The tradeoff is fees — the collars front-load impact and land-cash costs that Chicago does not charge, covered below.
For Chicago rehab-permit detail that overlaps a teardown workflow, see the Chicago permits and building code guide.
Chicago new-construction permit fees
Chicago does not price permits off project cost. It multiplies gross square footage x a construction factor x a scope-of-review factor, subject to minimum fees. From the city’s 2025 Building Permit Fee Tables:
| Permit item | Minimum fee | Note |
|---|---|---|
| Residential, ≤4 stories and ≤3 dwelling units | $2,350 | Use this floor for a new SFR spec build |
| All new construction (first buildout) | $3,550 | Larger/multi-unit new construction |
| Detached private garage/carport | $600 | In addition to the primary residence fee |
| Water service work | Separate Water Service Permit | Tap/meter charges per the Citywide schedule |
The earlier “$602 base minimum” figure that circulates online is not the ground-up number — for a new single-family spec build, start from the $2,350 minimum and scale by square footage using the DOB fee calculator for a real number. Exact construction-factor and scope-factor multipliers, and current residential water tap/meter dollar amounts, should be pulled live from the DOB calculator and the Water Service Price Schedule before you lock a budget; treat any single quoted rate as approximate until you run your own square footage.
Zoning, FAR, and ADU
Chicago residential districts (Title 17). New detached-house and small-flat infill sits in the RS (single-unit) and RT (two-flat/townhouse) families. The binding constraint on Chicago infill spec is floor-area ratio, not setbacks:
| District | Approx. FAR | Frontage/notes |
|---|---|---|
| RS-2 | ~0.65 | Front setback ~20 ft; combined side ~4 ft; 25 ft min frontage |
| RS-3 | ~0.9 | 2,500+ sf lots; front ~15 ft; allows a two-flat as well as a single-family home |
| RT-4 | Higher (multi-unit) | Two-flats/townhouses; ADUs by-right (see below) |
On a standard 25x125 (3,125 sf) RS-3 lot, 0.9 FAR caps building area near ~2,800 square feet, which pushes spec value into finishes and basement build-out rather than footprint. That FAR ceiling is why north-side spec economics reward high-end finish over raw size.
ADU / additional dwelling units. Chicago’s permanent ADU expansion ordinance takes effect April 1, 2026. RT and RM districts allow ADUs by-right citywide (except downtown); RS districts inside the original pilot areas remain eligible, while RS outside the pilot areas requires aldermanic opt-in, and coach-house builds carry a labor/apprenticeship mandate. For a ground-up builder, the takeaway is that an accessory unit can now be underwritten as a by-right second income stream on RT/RM infill in most of the city — read the Chicago ADU ordinance investor guide before you design the plan set.
Collar contrast. Collar municipalities zone single-family by lot-size district (e.g., Naperville R-1A/R-1/R-2) and entitle new subdivisions or PUDs through the plat process — which is where the land-cash and impact obligations attach. A teardown-rebuild on an existing platted lot generally avoids a new plat but can still trigger municipal donation and impact fees at building-permit stage.
Contractor and GC licensing — the Illinois traps
Illinois has no statewide general-contractor license — GC licensing is municipal. That produces two traps that trip up out-of-state sponsors and lenders.
- Chicago requires a General Contractor license under Municipal Code Ch. 4-36, in five classes tied to project-value caps: Class E ≤ $500,000; D ≤ $4M; C ≤ $10M; B ≤ $20M; A unlimited. License fees run from about $325 (Class E) to $10,000 (Class A) per two-year cycle, and general-liability insurance scales by class (roughly $1M/occurrence at Class E up to $5M at Class A, with Classes C and D moving to $2M effective January 1, 2026). The license auto-inactivates if the insurance lapses.
- Roofers are state-licensed by IDFPR — an active IDFPR Roofing Contractor license is required statewide.
- Plumbers are licensed through the Illinois Department of Public Health (IDPH), not IDFPR. This is the single most common verification trap: there is no IDFPR plumbing license to look up, so a lender or sponsor who checks only the IDFPR portal will wrongly conclude a licensed plumber is unlicensed. Electricians are licensed at the city/county level.
Verify roofers and other IDFPR trades at the IDFPR lookup; verify plumbers through IDPH; verify Chicago GCs and trades through the city’s contractor license search. Jaken Finance Group underwrites the GC’s class against your project value on Chicago files — a Class E GC cannot carry a $700,000 vertical.
Impact, land-cash, and tap fees — the collar money
This is where the city-versus-collar contrast produces real dollars. Chicago charges a formula permit fee but no per-lot park or school land-cash and no county road impact fee — a genuine per-lot cost advantage. The collars review faster but stack donation and impact fees that can add five figures per single-family lot.
| Fee | Chicago | DuPage | Will | Naperville |
|---|---|---|---|---|
| County transportation impact fee (SFR) | None | $0 (eliminated 2023) | $9,374 (up from $5,193 in 2025) | Per its county |
| Park/school land-cash per home | None | Per municipality | Per municipality | ~$15,000-$25,000+ combined |
| Building permit basis | Sq ft x factors, $2,350+ min | Municipal schedule | Municipal schedule | Municipal schedule |
- Will County’s transportation impact fee for a single-family home rose from $5,193 to $9,374 under a schedule the county advanced in 2025 (revised to fold in right-of-way and land-acquisition costs), authorized by the Illinois Road Improvement Impact Fee Law.
- DuPage County eliminated its transportation impact fee in 2023 — explicitly to attract development. So a DuPage build skips the county road fee that a Will County build now pays; that ~$0 versus ~$9,374 per house delta is a clean, quotable contrast and belongs in every collar-county pro forma before land close.
- Naperville’s Land-Cash Ordinance requires developers to dedicate park and school land or cash-in-lieu on residential development creating a net increase in buildable lots. The formulas use population generated from a bedroom-based table, park land at 8.6 acres per 1,000 persons valued at $323,600/acre, and school land valued at $318,300/acre. Worked from the ordinance, a four-bedroom detached home carries roughly $9,700 in park donation alone (three-bed ~$8,150; five-bed ~$10,400), with the school donation additional — combining to the ~$15,000-$25,000+ range above. Those land values are 2007-adopted FMV and may understate today, so treat the exact per-home figure as illustrative and verify the current schedule before you commit.
For a fuller city-versus-collar economic read, see the collar-vs-city BRRRR guide.
Cost to build per square foot
| Grade | $/sf (Chicago metro) | Use case |
|---|---|---|
| Illinois state average | ~$151/sf | Baseline reference |
| Chicago metro average | ~$181/sf | Local cost index ~1.20x |
| Standard custom | $150-$180/sf | Production/semi-custom spec |
| Premium | $180-$220/sf | Move-up collar product |
| Luxury | $220-$270/sf | North Shore, Hinsdale |
| High-end city infill | $600/sf+ | Prime north-side finish-out |
A 2,000-square-foot standard build lands roughly $300,000-$443,000 in hard costs excluding land; add land, excavation, deep frost footings, radon rough-in, and permits, and a city infill house routinely clears $500,000+ all-in before builder margin. Chicago rehab-side cost benchmarks inform finish budgets, but a ground-up build carries cost lines a gut rehab never sees — excavation and spoil haul-off, a full 42-inch frost foundation, new utility taps, and radon rough-in — so do not size a new-construction budget off rehab-per-foot data.
Named build submarkets
| Submarket | Character | Data point |
|---|---|---|
| Lincoln Park / Bucktown / Logan Square | Premier teardown-rebuild on 25 ft lots | Land-basis dominated; prime-block teardown lots commonly seven figures |
| Portage Park / West Ridge (NW bungalow belt) | More affordable infill/teardown | Value in finish-out under RS-3 FAR caps; construction-cost dominated |
| Hinsdale (DuPage) | Blue-chip collar teardown | New homes median list ~$1.6M; custom $275-$450+/sf; total $1.2M-$3M+ |
| Naperville (DuPage/Will) | Large-lot move-up + teardown | Median home ~$500K, ~$248/sf; submarket median ~$574K |
| Elmhurst (DuPage) | Active inner-collar teardown | Median home value ~$454K |
The financing takeaway: north-side Chicago and Hinsdale are land-basis dominated (lot can be 40%-60%+ of value), so the 75% LTARV cap tends to bind and the loan behaves like a land-plus-carry facility. The NW-side bungalow belt and outer-collar production markets are construction-cost dominated, so LTC drives the advance and draw discipline matters most. Match the loan structure to the submarket, not to a single statewide rule of thumb.
Winter carry, frost footings, and radon
Illinois climate is a real underwriting line item, not a footnote.
- Frost-depth foundations: the Chicago Building Code requires footings at least 42 inches (3’6”) below grade, matching the local frost line. Deep footings and full basements are standard and add both cost and winter schedule risk.
- Winter carry: foundation and flatwork pours are freeze-sensitive. A Q4-Q1 start typically means winter concrete measures (blankets, admixtures) or a schedule slip, which extends interest carry through the Chicago winter. This is why we size a 6-month interest reserve (versus 2-4 months in warm-climate builds) on winter-start Illinois files — the reserve absorbs the carry when the foundation draw stalls behind a cold snap and keeps the loan current without a monthly cash call.
- Radon: Illinois’ Radon Resistant Construction Act requires passive radon-resistant systems in new residential construction. Budget the rough-in on every ground-up house.
Worked example 1 — Chicago north-side teardown (sell-out exit)
Scenario: RS-3 lot in Logan Square, 25x125. Teardown of an existing frame cottage, build a 2,800 sf single-family spec home. Repeat spec builder (80% LTC tier), targeting a sell-out.
| Line item | Amount |
|---|---|
| Land / teardown lot | $525,000 |
| Demolition + site + deep frost foundation | $75,000 |
| Vertical construction (2,800 sf @ ~$205/sf) | $574,000 |
| Soft costs (design, permits, DOB, radon, survey) | $46,000 |
| Contingency (12% of hard costs) | $78,000 |
| Total project cost (TPC) | $1,298,000 |
| As-completed value (appraised) | $1,750,000 |
Loan sizing. At 80% LTC the cost-based number is $1,038,400. The LTARV cap is 75% x $1,750,000 = $1,312,500. We fund the lower, so the loan is $1,038,400 (LTC binds here) and the sponsor brings ~$259,600 of equity plus closing costs.
Carry. Interest-only at ~11% on an average outstanding balance of roughly $625,000 over a 12-month build (draws ramp, so average is well below the full commitment) ≈ $68,750 of interest, funded partly from a 6-month interest reserve given a likely winter foundation pour.
Sell-out exit. Sale at $1,750,000, less 8% sale costs (commission, transfer taxes, closing) = $140,000, nets $1,610,000. After repaying the $1,038,400 loan and carry, and returning the sponsor’s equity, the gross profit before the builder’s own overhead lands in the low-to-mid six figures — a healthy margin that lives or dies on holding the land basis and the ~$205/sf vertical. If either slips, the FAR-capped 2,800 sf ceiling limits how much value you can add back.
Worked example 2 — Naperville build-to-rent (DSCR takeout)
Scenario: New 3,200 sf detached single-family home on a platted Naperville lot, built to hold as a rental. First-time ground-up sponsor (70% LTC tier), planning a DSCR refinance rather than a sale. This is the collar-county counterpart — faster review, but the land-cash and impact fees hit.
| Line item | Amount |
|---|---|
| Land (platted lot) | $260,000 |
| Site + 42” frost foundation | $58,000 |
| Vertical construction (3,200 sf @ ~$185/sf) | $592,000 |
| Naperville land-cash (park + school, 4-bed) | $22,000 |
| Will/DuPage + municipal permit/impact fees | $14,000 |
| Soft costs (design, survey, radon) | $34,000 |
| Contingency (12%) | $80,000 |
| Total project cost (TPC) | $1,060,000 |
| As-completed value | $1,300,000 |
Loan sizing. At 70% LTC (first-timer) the cost-based number is $742,000. The LTARV cap is 75% x $1,300,000 = $975,000. We fund the lower — $742,000 (LTC binds), sponsor equity ~$318,000 plus soft costs. Note the collar fees ($22,000 land-cash + $14,000 impact/permit = $36,000) are real cost that a Chicago build on the identical footprint would largely avoid — that swing is worth roughly a full point of margin on a $1M project.
Carry. Interest-only at ~11.5% on an average balance near $450,000 over a 12-month term ≈ $51,750, with a shorter interest reserve than the Chicago file because a spring start avoids the worst winter carry.
DSCR takeout. At completion the home rents to support a DSCR permanent loan at 5.75%-10.5%, 70%-75% LTV. At 72% LTV on the $1,300,000 as-completed value, the permanent loan is ~$936,000 — enough to retire the $742,000 construction loan and accrued carry and return a meaningful slice of the sponsor’s equity while keeping the asset. If the rent supports at least a 1.0 DSCR at the takeout rate, the sponsor holds a new-construction rental with most capital recycled. See DSCR loans in Illinois and the build-to-rent builder hub for the permanent-loan side and portfolio single-close structures.
Exit strategies — sell-out vs DSCR takeout
Both worked examples show the two exits Jaken Finance Group underwrites. Sell-out suits land-basis-dominated north-side and Hinsdale product where the buyer pool is deep and velocity is high; model 8% all-in sale costs (commission, Illinois/Cook County transfer taxes, closing) and price the FAR ceiling into your ARV. DSCR takeout suits collar-county build-to-rent where you want to hold a new asset — the permanent loan at 5.75%-10.5%, 70%-75% LTV retires the construction facility and recycles equity, provided rents clear a 1.0+ DSCR. Many sponsors underwrite both exits at land close so a soft resale market has a rental fallback. For the acquisition-and-flip variant, see fix and flip loans in Illinois.
Common mistakes on Illinois builds
| Mistake | Consequence | Fix |
|---|---|---|
| Using the “$602” permit figure for ground-up | Under-budgeted DOB fees | Start from $2,350 min, run the DOB calculator |
| Ignoring Naperville land-cash and Will County impact fees | $15K-$35K surprise at permit | Underwrite collar fees before land close |
| Checking only IDFPR for the plumber | Wrongly flag a licensed plumber | Verify plumbers through IDPH, not IDFPR |
| Sizing a Class E GC onto a $700K vertical | Permit/license mismatch | Match GC class to project value |
| No winter interest reserve on a Q4 start | Carry cash calls when foundation stalls | Size a 6-month reserve on winter starts |
| Assuming LTC drives every advance | Over-leveraged land-basis teardown | Remember we fund the lower of LTC and 75% LTARV |
How Jaken Finance Group structures Illinois construction draws
We align draws to inspection milestones on the canonical sequence: foundation/site → framing/dry-in → MEP/mechanical rough → drywall/finish → CO/final. On a $500,000+ vertical that is 5-7 draws, each funding 48-72 hours after a third-party inspection, and we never front-load more than 20% of the budget before the foundation inspection. On Chicago winter starts we hold the framing draw until the foundation is inspected and backfilled rather than advancing against a cold-weather pour that has not been verified. See the draw process walkthrough for the borrower-side checklist, and hard money lenders in Chicago and statewide hard money for how construction draws differ from acquisition-only bridge. For larger multi-unit or mixed-use ground-up, see commercial and multi-unit lending in Illinois and the Chicago new-construction loan page. Naperville luxury custom builders should also review luxury new construction loans in Naperville.
Every Jaken Finance Group construction loan here is business-purpose, non-owner-occupied investment property only.
Official resources
| Resource | Link |
|---|---|
| Chicago DOB — permits hub | chicago.gov — Building Permits |
| Chicago DOB — Self-Certified Permit Program | chicago.gov — Self-Cert |
| Chicago DOB — permit fee calculator | chicago.gov — Fee Calculator |
| Chicago — General Contractor License (Ch. 4-36) | chicago.gov — GC License |
| Chicago — ADU expansion ordinance (Apr 1, 2026) | chicago.gov — ADU Ordinance |
| Naperville — Land-Cash Donation (Common Questions PDF) | naperville.il.us — Land-Cash |
| IDFPR license lookup (roofers & state trades) | online-dfpr.micropact.com |
| Chicago Water Service Price Schedule | chicago.gov — Water Price Schedule |
Bookmark the DOB fee calculator and the Naperville land-cash PDF before you underwrite — those two documents decide whether a city or a collar lot pencils.
Disclaimer: Rates, terms and conditions offered only to qualified borrowers and are subject to change at any time without notice. Closing times are in business days and commence upon receipt of appraisal payment and satisfaction of borrower conditions. All loans are subject to full underwriting for loan approvals. Jaken Finance Group only finances non-owner occupied investment properties.
This guide is educational information for real-estate investors and builders, not legal, tax, or investment advice. Illinois municipal permit, zoning, licensing, and impact-fee rules change frequently — verify current figures with the Chicago Department of Buildings, the relevant collar-county and municipal building departments, and qualified Illinois professionals before you commit capital.
Related guides: New construction loans Chicago · Chicago infill teardown economics · Ground-up loans, no experience · DSCR loans Illinois · Vacant land financing
New construction application · Submit scenario · (833) 264-7776
Not sure which structure fits your lot? Find the right loan · (833) 264-7776