Is a separate post-installation inspection worth paying for?

For the items you listed, I’d use a roof-focused inspector rather than relying solely on a general home inspector. The distinction matters most for details that can look acceptable from the ground but affect water intrusion or warranty coverage:

- Verify step and counterflashing, wall and chimney flashing, pipe boots, valleys, drip edge, and ridge-cap installation.
- Compare the installed vents and intake ventilation with the contract and manufacturer requirements. More vents aren’t automatically better if intake airflow is missing or blocked.
- Check shingle fastening, exposure, alignment, seal strips, and penetrations where safely accessible.
- Document deficiencies with dated photos before releasing the remaining payment.

A general inspector can be perfectly adequate for the cleanup portion, including nails in gutters or landscaping, blocked downspouts, leftover materials, and visible damage to siding, windows, trim, or plants. They may also flag obvious roof defects, but many won’t evaluate installation to the same depth as someone who routinely inspects roofing systems.

I’d also separate the inspection from the installer’s warranty process. Ask for the permit’s final approval, manufacturer warranty registration, disposal documentation if applicable, and written confirmation of any punch-list repairs. The inspection fee is easier to justify when the report gives you a clear, documented list rather than just another visual walkthrough.

Before scheduling an inspection, I’d review the contract’s payment, punch-list, notice, and dispute provisions. A roof-focused inspector can document apparent installation or cleanup deficiencies, but the report itself usually won’t determine whether withholding payment is permitted or establish a contract breach.

If the inspection identifies problems, send the contractor the specific photos and relevant contract references, then follow any required notice and cure process. It also helps to distinguish safety or water-intrusion concerns from cosmetic cleanup items, since the contract may treat them differently. The report is most useful as contemporaneous evidence and a repair checklist, not as a substitute for the contract’s payment terms.

One practical limitation to pin down before booking is the inspector’s access and reporting scope. “Roof inspection” doesn’t necessarily mean they’ll verify every installation detail.

Ask for the scope in writing, including whether they will:

- Walk the roof, use a ladder, or inspect only from the ground, based on pitch and safety conditions
- Examine accessible attic areas and ventilation
- Check flashing, pipe boots, valleys, drip edge, and ridge caps
- Review contract specifications, manufacturer requirements, permit records, and installation photos
- Identify which items cannot be verified without removing shingles or other invasive testing

A visual inspection generally can’t confirm concealed underlayment, every fastener, or flashing hidden beneath finished materials. The report should distinguish “not observed,” “not accessible,” and “defective,” rather than implying those areas were fully verified. That distinction matters if the remaining payment or a warranty claim later depends on what the inspection actually established.

Reviewing manufacturer requirements and installation photos should be explicitly included in the inspection scope, not assumed to be part of a roof inspection. Unless the inspector receives the relevant contract, product documentation, and reliable, dated installation photos, they may not be able to make a meaningful comparison. Many inspectors are engaged only to assess visible conditions, not to audit the installer’s compliance with a particular manufacturer system.

That comparison should be listed in the written agreement. Otherwise, the report should say that contract and manufacturer compliance was not verified rather than implying it was checked. Installation photos can be useful evidence, but they do not necessarily establish what was installed if the images are incomplete or lack location and timing information.