Why Inspectors Make Specialist Recommendations
The ASHI Standards of Practice defines the scope of a home inspection as a visual examination of readily accessible systems and components. Inspectors observe and report. They don't disassemble equipment, test beyond normal operating controls, or perform engineering calculations.
When an inspector sees something that requires more than a visual assessment to understand fully, the professional response is to recommend a specialist. This isn't avoiding responsibility. It's the inspection doing its job correctly. The inspector identified that you need a deeper look. The specialist delivers a concrete answer.
Some specialist recommendations appear in nearly every inspection. Others indicate something unusual. Knowing which is which changes how urgently you need to respond.
Structural Engineer
This is the specialist recommendation that should always prompt immediate action before closing. Structural engineers evaluate foundations, framing, load-bearing elements, and related concerns that fall outside what a home inspector can assess with a visual pass.
An inspector who recommends a structural engineer has seen something that raises a question about structural integrity: significant foundation cracking, wall displacement, framing irregularities, unusual settlement patterns, or signs that a load-bearing element may have been modified or is underperforming. They're not saying the structure is failing. They're saying someone with engineering credentials needs to evaluate it before you can know that.
Structural engineering consultations for residential properties typically run $300 to $700 for an inspection with a written report. If the engineer recommends repairs, costs vary widely. Minor remediation might be a few hundred dollars. Foundation work can run $5,000 to $30,000 or more depending on the problem and repair method.
Never close on a house with an unresolved structural engineering recommendation. That is the one specialist referral on this list that functions as a stop sign until answered.
HVAC Technician
An HVAC evaluation recommendation usually means the inspector found the system operating but with signs of wear, age, or characteristics that raise questions about efficiency, safety, or remaining useful life. It can also mean the system wasn't tested because utilities were off or conditions didn't allow it.
A standard HVAC service inspection from a licensed technician runs $100 to $200 in most markets. More thorough evaluations including refrigerant charge check, heat exchanger inspection, and ductwork assessment typically run $200 to $400. This is relatively inexpensive information that often changes the negotiation conversation meaningfully.
The U.S. Department of Energy recommends annual HVAC maintenance, so a system that hasn't been serviced recently is worth evaluating regardless of what the inspection specifically flagged.
Electrician
Electrical specialist recommendations range from routine to serious. On the routine end: older panels that need a permit check, double-tapped breakers, outdated wiring in one section of the house. On the more serious end: evidence of DIY wiring work, ungrounded circuits throughout the house, Federal Pacific or Zinsco panels, or knob-and-tube wiring with modifications that may not be code-compliant.
A licensed electrician consultation typically runs $75 to $150 for a diagnostic visit. If work is needed, costs depend on scope. Panel replacements run $1,500 to $4,000 in most markets. Rewiring portions of a house can run $3,000 to $15,000 depending on extent.
The key question with electrical referrals: is this a documentation or code compliance issue, or a safety issue? The electrician will tell you which one it is.
Plumber
Plumbing specialist recommendations typically come from one of three sources: visible signs of active or past leaking, evidence of DIY plumbing work that may not be code-compliant, or concerns about older pipe materials.
Polybutylene piping (common in homes built between 1978 and 1995) and galvanized steel pipes in older homes are two materials that frequently generate plumber referrals. Both have known failure risk with age. A plumber can assess remaining useful life and provide a replacement estimate.
Sewer scope inspection is a separate specialized evaluation that inspectors sometimes recommend and sometimes perform themselves. It involves running a camera through the main sewer line to check for root intrusion, pipe separation, or other issues. This runs $100 to $300 as a standalone service and is worth doing on any home more than 20 years old even if the inspector doesn't specifically call for it.
Other Common Specialist Recommendations
Several other specialists appear regularly in inspection reports.
Chimney Inspector
A chimney sweep certified through the Chimney Safety Institute of America (CSIA) can assess firebox condition, flue liner integrity, damper operation, and creosote buildup. This is a fairly routine recommendation on any home with a wood-burning fireplace or wood stove. Chimney inspections run $100 to $250 and are considered standard practice before using a fireplace in a newly purchased home.
Roofer
When an inspector recommends a roofing contractor rather than just noting estimated remaining life, it usually means there's something they couldn't fully evaluate from their vantage point or damage is significant enough to warrant a contractor's detailed assessment. This is particularly common after hail or wind events. Get two or three estimates if the inspector recommends a roofer; repair vs. replacement recommendations vary considerably between contractors.
Environmental Specialist
Radon, asbestos, mold, and lead paint fall outside the scope of a standard home inspection. If any of these are flagged, the recommendation goes to an environmental testing company or a certified industrial hygienist. Radon test kits run $15 to $30 as a DIY option or $100 to $300 for professional testing. Mold assessment and remediation varies widely based on extent and affected materials.
Acting on Specialist Recommendations Before Closing
Most inspection contingency windows are 7 to 14 days. That's not a lot of time to schedule and receive multiple specialist reports. Prioritize in this order.
Structural engineer referrals first, no exceptions. Electrical and plumbing referrals second if the inspector flagged safety concerns. HVAC evaluations third, especially if the system is old or wasn't tested. Chimney, roofing, and environmental referrals can sometimes be negotiated as price credits rather than requiring the buyer to schedule evaluations before closing, depending on the market and the seller's position.
If you skip a specialist recommendation and close anyway, you own that unknown. Some unknowns turn out to be nothing. Others turn into the $18,000 foundation repair nobody warned you about because you ran out of contingency window time.