Types of Home Inspections: A Buyer’s Guide
Buyers often assume a single “home inspection” covers everything from the roof to the radon level. It does not. There are several distinct types of home inspections, each with its own scope, qualifications, and price, and knowing which ones apply to a given property can save thousands of dollars after closing. A general inspection is the starting point, but septic systems, sewer lines, chimneys, and environmental hazards usually require separate specialists. A buyer who books only the base inspection and then discovers a collapsed sewer line or an elevated radon level after moving in has learned this lesson the expensive way. This guide breaks down the most common categories so Front Range buyers can budget and schedule the right combination for the house they are under contract on.
What are the main types of home inspections?
The most common type is the general home inspection, a visual, non-invasive assessment of a home’s accessible systems performed before closing. Beyond that, buyers encounter specialized inspections: four-point inspections for insurance, wind mitigation, sewer scope, chimney, pool, well and septic, and environmental tests for radon, mold, asbestos, and lead. Each addresses a specific risk a general inspector is not licensed or equipped to evaluate in depth.
The American Society of Home Inspectors describes the general inspection as covering the structure, exterior, roofing, plumbing, electrical, heating, cooling, interior, insulation, and ventilation. It is the backbone most other inspections build on, and it is the one nearly every purchase contract references. The specialized inspections layer on top of it, ordered selectively based on what the property’s age, systems, and location demand. For an overview of how that fits into a purchase, the broader guide to hiring a home inspector walks through scheduling and contingencies.
The general (buyer’s) home inspection
A standard buyer’s inspection typically takes two to four hours for an average single-family home and costs roughly $350 to $600 on the Colorado Front Range, depending on square footage and age. The inspector walks the property, photographs defects, and delivers a written report — often 30 to 60 pages — within 24 hours. The report flags safety issues, deferred maintenance, and items near the end of their service life. It is the document a buyer takes to the negotiating table during the inspection objection period.
What it does not do is open walls, move heavy furniture, or guarantee hidden conditions. Inspectors follow a standards-of-practice document that limits them to readily accessible, visually observable components. That is why the report frequently recommends further evaluation by a licensed trade when something looks marginal. The phrase “recommend further evaluation” is not boilerplate to skim past — it is a flag that the inspector saw something they are not licensed to diagnose fully. Buyers who want to understand exactly what falls inside that scope can review a detailed breakdown of what a home inspector does before the walkthrough.
Pre-listing and pre-purchase variants
A pre-purchase inspection is the version a buyer orders during the contract’s inspection objection window. A pre-listing inspection is the same scope ordered by the seller before the home hits the market, allowing them to fix problems ahead of offers and price the home with fewer surprises. The procedure is identical; only the timing and who pays differ. A pre-listing inspection can speed a sale, but a buyer should still order their own rather than relying solely on the seller’s report, since the buyer’s inspector works for the buyer.
What a general inspection includes
A standard general inspection moves through the home system by system. The roof is checked for covering condition, flashing, and signs of leaks. The exterior covers siding, trim, windows, grading, and drainage. The structure and foundation are examined for visible cracks and settlement — a real concern on the Front Range’s expansive clay soils. Plumbing, electrical, heating, and cooling are each operated and observed within the limits of the standard, and the interior is checked for evidence of past water intrusion.
The inspector also notes the approximate age and remaining service life of major equipment: the furnace, water heater, and air conditioner. A 17-year-old furnace that runs today still earns a note that it is near the end of its expected life. This forward-looking information is part of what makes the inspection worth its fee — it tells the buyer not just what is broken now, but what is likely to need replacing soon.
Specialized and ancillary inspections
General inspectors routinely recommend ancillary services for systems outside their standard scope. The most common on the Front Range include:
- Sewer scope: a camera run down the main line to find root intrusion, bellies, or collapsed clay pipe. Common in older Denver and Boulder neighborhoods; typically $150 to $300.
- Radon test: Colorado is a high-radon state, so this is nearly universal here. A continuous monitor runs 48 hours.
- Chimney and fireplace: a Level 2 chimney inspection uses a camera to check the flue liner for cracks and creosote.
- Well and septic: required for rural Douglas, Elbert, and Jefferson County properties on private systems.
- Pool and spa: equipment, bonding, heater, and surface condition.
Environmental hazards deserve their own category. Homes built before 1978 may contain lead paint, and homes built before the mid-1980s may contain asbestos in flooring, popcorn ceilings, or pipe wrap. These are evaluated through testing, not a visual general inspection — see the dedicated coverage on lead inspection for how that process works. Each ancillary service is a separate transaction with its own fee, though many companies bundle them into a single visit.
Insurance-driven inspections
Two inspection types exist mainly to satisfy insurers rather than buyers. A four-point inspection looks only at the roof, electrical, plumbing, and HVAC — the four systems most likely to trigger a claim — and is often required to bind a policy on an older home. A wind mitigation inspection documents roof shape, attachment, and bracing to qualify for premium discounts; it is far more common in hurricane states than in Colorado, but relocating buyers may encounter it.
These reports use insurer-supplied forms and have nothing to do with the negotiation between buyer and seller. They are a separate transaction, sometimes performed by the same inspector during the same visit for an added fee. A buyer who is told by their insurer that a four-point is required should schedule it alongside the general inspection rather than scrambling for it just before closing.
New construction and phase inspections
Buyers of newly built homes often skip inspection, assuming the builder and municipal code officials caught everything. That assumption is risky. A new-construction inspection — and ideally a series of phase inspections at the pre-pour, pre-drywall, and final stages — catches framing, flashing, and drainage errors before they are sealed behind finished walls. InterNACHI publishes new-home inspection standards that many Front Range inspectors follow for these visits.
Municipal code inspectors verify compliance with building codes, but they are not checking workmanship to the same standard a private inspector applies, and they move quickly across many sites. A pre-drywall inspection that catches a missing nailing pattern or an improperly flashed window is far cheaper to remedy before the drywall goes up than after the buyer discovers a leak two winters later.
How to choose which inspections you need
Match the inspection list to the property’s age, location, and systems. A 2020 townhome on city water and sewer in Aurora needs a general inspection and a radon test, and little else. A 1955 ranch in Boulder on a septic system likely warrants a general inspection, radon, sewer scope, septic evaluation, and possibly asbestos and lead testing. The combination is not one-size-fits-all, and a good inspector helps the buyer assemble the right bundle.
Ask the general inspector during scheduling which ancillary services they recommend for the address; experienced local inspectors know which neighborhoods have clay sewer lines or known soil issues. Confirm each specialist’s license or certification, and budget for the bundle rather than the single base fee. Spending an extra few hundred dollars on a sewer scope is cheap insurance against a five-figure line replacement, and the same logic applies to radon mitigation or an environmental test. The goal is to spend a little more during the inspection period to avoid a much larger surprise after closing.
Who performs each type of inspection
Different inspections require different qualifications, and matching the right professional to the job is part of doing this well. A general inspection is performed by a home inspector certified through ASHI or InterNACHI. Because Colorado does not license home inspectors at the state level, that certification — rather than a state license — is the credential buyers should verify, along with current liability and errors-and-omissions insurance.
Specialized inspections often fall to dedicated trades. A sewer scope is run by a plumber or a sewer-scope specialist with a push camera. Radon testing is done by a measurement professional or an inspector with radon training, using calibrated equipment. Chimney inspections go to a certified chimney sweep. Well and septic evaluations require providers familiar with private-system standards and, in some counties, permits. Environmental testing for asbestos and lead requires certified inspectors and accredited laboratories, because these are regulated activities with specific sampling protocols.
The advantage of a multi-service inspection company is coordination: one point of contact schedules the general inspection and arranges the ancillary services with vetted partners, so the buyer is not chasing four separate providers during a tight contract window. When using separate specialists, confirm each one’s credentials independently rather than assuming the general inspector’s recommendation guarantees quality. A buyer who lines up the right mix of qualified professionals early in the inspection period gives themselves the fullest possible picture of the home before the objection deadline arrives.
One more practical note: schedule the inspections in a sensible order. The general inspection often surfaces issues that determine which specialists to call, so booking it first — then the ancillary services it prompts — avoids paying for an evaluation the general inspection would have shown was unnecessary. On the Front Range, radon and a sewer scope on older homes are common enough that many buyers book them alongside the general inspection from the start.
Budgeting helps too. A buyer who knows the home is a 1960s ranch on a septic system can estimate the full inspection bundle — general inspection, radon, sewer scope, septic evaluation, and possibly lead and asbestos testing — and set aside the funds before the contract is signed. Discovering mid-contract that the right combination costs more than expected, and then skipping a needed test to save money, is exactly the false economy that leads to expensive surprises after closing. Treat the inspection bundle as a planned line item, not an afterthought.
Why skipping the right inspection costs more later
The strongest argument for assembling the right combination is the asymmetry of the cost. A sewer scope runs a couple hundred dollars; replacing a collapsed main line can run five figures. A radon test costs little; mitigating a high-radon home is a one-time expense, but the health risk of ignoring it for years is the real cost. An environmental test on an older home is modest; discovering asbestos or lead mid-renovation — after disturbing it — turns a manageable situation into an emergency.
In every case, the inspection or test is the cheap insurance, and the deferred problem is the expensive claim. Buyers who treat the base inspection as the whole job, rather than the foundation of a tailored bundle, are the ones who write angry reviews six months after closing about a sewer line or radon level “nobody told them about.” The information was available; it simply was not ordered.
The disciplined approach is to ask the inspector early which services the specific property warrants, budget for the bundle, and schedule the work to fit inside the inspection objection period. That window is finite, and lab turnaround on some tests eats into it, so starting promptly matters. A buyer who treats the inspection period as the time to learn everything material about the home — across all the relevant inspection types — walks into closing with knowledge rather than hope, and into negotiation with documentation rather than guesses.
References
- ASHI Standard of Practice for home inspections — American Society of Home Inspectors
- InterNACHI Standards of Practice — International Association of Certified Home Inspectors
- International Residential Code reference — International Code Council