A home inspection in the northwest Chicago suburbs should always include a general inspection covering structure, systems, and major components — plus radon testing at minimum. For older homes, add a sewer scope. The inspection period, typically 5–10 business days, is your opportunity to understand exactly what you're buying and negotiate from a position of knowledge.
Key Takeaways
- A general home inspection covers the roof, foundation, electrical, plumbing, HVAC, and more — budget $400–$600 for a typical single-family home in this area
- Radon testing is strongly recommended in Illinois; the state has above-average radon levels and sellers must disclose known test results
- A sewer scope is a smart add-on for any home built before the 1980s — lateral sewer lines in older neighborhoods are a common source of expensive surprises
- The inspection period in Illinois is typically 5–10 business days — use every day of it
- Your inspector's job is to inform you, not to tell you whether to buy — that decision is yours
- Issues found during inspection can be used to negotiate repairs, credits, or a price reduction
- Never waive your inspection contingency without fully understanding what you're giving up
Why the Inspection Period Matters So Much
This can feel like a formality when you're excited about a home. It isn't.
The inspection period is the one window you have to look inside the walls, under the crawl space, and behind the water heater before you're legally and financially committed. Once you close, what's there is yours — surprises and all.
A lot of buyers in competitive markets feel pressure to move fast or go easy on inspection requests. That's understandable. But going in informed is almost always worth it. The goal isn't to find a reason to walk away. It's to know exactly what you're buying so you can make a confident decision.
Let's walk through what a thorough inspection actually covers.
What Does a General Home Inspection Cover?
A licensed home inspector will do a visual examination of the home's accessible systems and components. Here's what a standard inspection includes:
Structure and exterior
- Foundation — cracks, settling, water intrusion signs
- Grading and drainage — does water flow away from the home?
- Exterior walls, siding, and trim
- Driveway, walkways, and steps
- Garage structure, door operation, and fire separation
Roof and attic
- Roof covering condition — shingles, flashing, gutters, downspouts
- Attic insulation and ventilation
- Signs of past or active leaks
- Chimney condition if applicable
Electrical
- Main panel — breaker condition, labeling, capacity
- Visible wiring — look for knob-and-tube or aluminum branch circuit wiring in older homes
- Outlets, switches, GFCI protection in kitchens, bathrooms, and exterior locations
- Smoke and carbon monoxide detector placement
Plumbing
- Water supply lines — material, pressure, visible leaks
- Drain lines — flow, condition, signs of slow drainage
- Water heater — age, condition, proper venting
- Fixtures throughout — toilets, sinks, tubs, showers
HVAC
- Furnace — age, condition, filter, heat exchanger
- Central air — age, condition, refrigerant lines
- Ductwork — condition, distribution, any visible concerns
- Thermostat operation
Interior
- Ceilings, walls, and floors — cracks, stains, soft spots, signs of water
- Windows and doors — operation, seals, locks
- Stairs and railings
- Basement or crawl space — moisture, insulation, structural concerns
This is a visual inspection — inspectors don't open walls or move furniture. What they can see, they'll document. A good inspector will also tell you what to watch going forward, not just what's wrong today.
Budget $400–$600 for a standard single-family inspection in the northwest suburbs. Larger homes, homes with multiple HVAC systems, or homes with crawl spaces may cost more. It is money very well spent.
Why Radon Testing Is Non-Negotiable in Illinois
Illinois is a high-radon state. The Illinois Emergency Management Agency recommends that all homes in Illinois be tested — not just older ones, not just certain neighborhoods. Radon doesn't discriminate by home age, price, or zip code.
Radon is a colorless, odorless radioactive gas that forms naturally from uranium in the soil. It enters homes through foundation cracks, sump pits, and other openings. Long-term exposure at elevated levels is the second leading cause of lung cancer in the United States, according to the EPA.
Here's what to know as a buyer:
The EPA action level is 4 picocuries per liter (pCi/L). If your test comes back at or above that number, mitigation is recommended.
Sellers in Illinois must disclose known radon test results. But disclosure only covers what they know. If the home has never been tested — which is common — there's nothing to disclose. That's why you test yourself.
Mitigation is straightforward and affordable. A sub-slab depressurization system — the standard fix — typically costs $800–$1,200 depending on the home's foundation type and layout. It's a one-time cost, and post-mitigation levels almost always drop well below the action threshold.
If the home already has a mitigation system, ask for documentation of the original test results and any post-mitigation testing. Verify the system is functioning properly during your inspection.
Add radon testing to every inspection. It runs about $150–$200 as an add-on and takes 48 hours with a passive canister. The EPA's Home Buyer's and Seller's Guide to Radon is a straightforward resource if you want to read more.
When to Add a Sewer Scope
A sewer scope is a camera inspection of the lateral sewer line — the underground pipe that runs from your home to the municipal sewer main in the street.
It is not included in a standard home inspection. You have to request it separately.
Here's why it matters in the northwest suburbs: a large portion of the housing stock here was built in the 1950s, 1960s, and 1970s. Many of those homes have original clay or Orangeburg sewer lines that are now 50–70 years old. These materials deteriorate over time — they crack, collapse, or get infiltrated by tree roots.
A full lateral sewer replacement can cost $8,000–$20,000 or more depending on depth, access, and length. A sewer scope costs $150–$300. That math is easy.
Add a sewer scope to your inspection if:
- The home was built before 1985
- There are large trees in the yard, especially near the foundation or parkway
- The listing has had any plumbing issues disclosed
- You're buying in an established neighborhood with mature tree canopy
Even on newer homes, a sewer scope is low-cost insurance. It's one of the most common recommendations I make to buyers in this area.
Other Add-On Inspections Worth Knowing About
Depending on the home, you may want to consider one or more of these:
Chimney inspection If the home has a wood-burning fireplace or a gas appliance vented through a masonry chimney, a Level 2 chimney inspection by a certified chimney sweep is worth the cost. Standard home inspectors note visible chimney concerns but don't evaluate the interior flue. Chimney issues — cracked liners, deteriorated mortar — can be fire hazards and are expensive to repair.
Lead paint disclosure For homes built before 1978, federal law requires sellers to disclose known lead paint hazards. Your inspector will note deteriorating paint that may contain lead, but a full lead paint inspection requires a certified lead inspector. If you have young children or plan to renovate, this is worth discussing with your inspector.
Asbestos Homes built before the mid-1980s may contain asbestos in floor tiles, pipe insulation, ceiling texture, or roofing materials. Asbestos that is intact and undisturbed is generally not an immediate hazard — but if you're planning any renovation work, knowing what's there matters. Your inspector can flag suspect materials; testing requires a certified professional.
Mold If your inspector finds visible mold, elevated moisture readings, or signs of past water intrusion, air quality testing may be warranted. Mold issues are often tied to ventilation, grading, or roof problems that are addressable — but you want to know the scope before you close.
Well and septic Most homes in the northwest suburbs are on municipal water and sewer. But if you're looking at a home in a more rural edge area that has a private well or septic system, those require separate specialized inspections.
What to Do During the Inspection
Show up. This is not optional.
Your inspector will spend two to three hours walking through the home. Being there lets you ask questions in real time, see issues firsthand, and get a much clearer picture than any written report provides. You'll learn how the mechanicals operate, where the shutoffs are, and what to watch for after you move in.
A few things to do while you're there:
- Bring a notepad or use your phone to photograph anything that catches your attention
- Ask your inspector to explain anything you don't understand — they expect this
- Pay attention to how they describe severity: a safety issue is different from a maintenance item
- Ask specifically about the age and expected remaining life of the roof, furnace, water heater, and AC
You're not there to get rattled by every small item on the report. Older homes have quirks. What you're looking for is a clear picture of the big stuff — and confidence that you know what you're buying.
How to Use Inspection Results in Negotiations
Once you have the report, you have options. Here's how this typically works in Illinois:
Your attorney review and inspection period overlap in most Illinois transactions. After reviewing the report, you can:
- Request repairs — ask the seller to fix specific items before closing
- Request a credit — ask for a dollar amount credited to you at closing, which you use to address issues yourself
- Request a price reduction — adjust the purchase price to reflect the condition
- Accept the home as-is — proceed without requesting anything
- Cancel the contract — walk away and have your earnest money returned, if within the inspection contingency window
In practice, most negotiations land somewhere in the middle. Major safety issues — a failed heat exchanger, active water intrusion, a deteriorated sewer line — are worth negotiating. Cosmetic items and normal wear are usually not.
Your agent and attorney will help you frame requests in a way that keeps the deal moving while protecting your interests.
One Thing Buyers Sometimes Forget
After your inspection, have your agent or attorney confirm the property's PIN and pull the current assessed value and exemption status on the Cook County Assessor's website. Understanding how Cook County property taxes work — and what the previous owner's exemptions were — can meaningfully affect your monthly budget going forward.
If you're still early in the process and working through financing options, the post on IHDA down payment assistance is worth a read. And if you're comparing neighborhoods, the northwest suburbs neighborhood guide breaks down the whole area side by side.
Finding the Right Inspector
Look for an inspector who is licensed in Illinois and carries errors and omissions insurance. Membership in a professional organization like the American Society of Home Inspectors (ASHI) is a good sign — it indicates ongoing education and adherence to a code of ethics.
Ask your agent for referrals, but also feel free to do your own research. Read reviews. Ask how long the inspection will take and what the report looks like. A good inspector takes their time, explains what they find, and gives you a clear, organized report — not a 200-item checkbox list with no context.
Ready to Walk Through This Together?
If you're under contract or getting close to making an offer, I'm happy to walk through what to prioritize for the specific home you're considering. Every house is a little different, and local knowledge matters here.
I share neighborhood tours, homebuying tips, and relocation insights regularly on my YouTube channel: Life in the NW Burbs.
Book a free consultation and let's talk through where you are in the process.
Or reach out directly at [email protected] or visit myrealtormari.com.
FAQs
What does a home inspection cost in the northwest Chicago suburbs?
A standard general home inspection for a single-family home in the northwest suburbs typically runs $400–$600. Larger homes or homes with crawl spaces may cost more. Radon testing adds approximately $150–$200, and a sewer scope runs $150–$300. Plan to spend $700–$1,000 for a thorough inspection package on a typical home.
Is radon testing required when buying a home in Illinois?
Radon testing is not legally required for buyers in Illinois, but it is strongly recommended. Illinois has above-average radon levels statewide, and the EPA recommends testing all homes. Sellers must disclose known radon test results, but if the home has never been tested, there is nothing to disclose. Always test yourself.
What is a sewer scope and do I need one?
A sewer scope is a camera inspection of the underground pipe running from your home to the municipal sewer main. It is not included in a standard home inspection — you request it separately. It is strongly recommended for homes built before 1985, homes with large trees near the foundation, or any home where plumbing concerns have been disclosed. A scope costs $150–$300; a full lateral replacement can cost $8,000–$20,000 or more.
Can I waive the home inspection to make my offer more competitive?
You can waive the inspection contingency, but it carries real risk. Without an inspection contingency, you cannot cancel the contract or renegotiate based on condition issues found after your offer is accepted. In some situations, buyers offer a pre-offer inspection instead of waiving entirely — this involves inspecting before submitting an offer so you can bid without a contingency while still knowing what you're buying. Talk to your agent about the right approach for a specific home.
What happens if the inspection finds major problems?
You have several options: request that the seller repair the issues before closing, ask for a credit or price reduction, accept the home as-is, or cancel the contract within the inspection contingency window and have your earnest money returned. Most negotiations land on a combination of credits and selective repairs. Your agent and attorney will help you decide what to request and how to frame it.
How long is the inspection period in Illinois?
The inspection period in Illinois is negotiable but typically runs 5–10 business days from the date the contract is accepted. This window covers scheduling the inspection, reviewing the report, completing attorney review, and submitting any repair or credit requests. Use the full window — don't rush the process on a decision this significant.
