The single most expensive line item you'll ever inherit from a New Mexico home purchase is the roof. Roof replacements in ABQ, Santa Fe, and Rio Rancho run $18,000 on a small asphalt house and $45,000+ on tile or foam. That's the entire due diligence problem in one sentence.
General home inspectors are trained to give you a systems overview. They are not qualified — legally or practically — to give you a remaining service life estimate on your roof. That's a different report.
What the general home inspector actually reports on your roof
The standard home inspection includes 15–30 minutes on the roof: visual inspection from ladder or drone, photos of obvious issues, and one paragraph in the report. The report language is intentionally hedged — "appears serviceable," "recommend further evaluation by a roofing professional," "nearing end of expected service life."
That language is not an opinion. It's a liability shield. The general inspector cannot be sued for saying "appears serviceable" if the roof fails in 18 months. That's why every home inspection in NM recommends further evaluation on roofs older than 10 years — every one.
What a pre-purchase roof inspection adds
A dedicated roof inspection during your due diligence period gives you three things the general home inspection cannot: (1) a written remaining service life estimate, (2) a repair-or-replace recommendation with priced scope of work, and (3) documentation strong enough to support a repair credit at closing.
In our experience, buyers who add a $199–$349 pre-purchase roof inspection recoup that cost about 6:1 on closing credits. The seller's roof language in the purchase agreement usually caps liability at what's disclosed. Once we document a specific defect with photos and a repair cost, that cap moves.
When you don't need it
Skip the dedicated inspection only when: the roof is under 5 years old with transferable warranty documentation, or the seller has already provided a paid inspection report from an independent (not the seller's contractor) inspector, or the general home inspector's report gives a specific remaining service life and repair scope (rare).
How to time it
Book the roof inspection to happen after the general home inspection and inside your due diligence window. That gives you the general inspector's report to build on, and it keeps you inside the timeline where you can renegotiate or walk. Same-week booking is standard for us — we run 3–5 pre-purchase inspections per week in ABQ metro.