Questions covered in this guide
Put the skylight in the project scope
VELUX discusses the choice between replacing a skylight and reflashing it during reroofing. The important homeowner step is to make that choice explicit rather than letting the existing skylight disappear inside a general roof allowance.
Gather the existing skylight story
Record what you know about the unit: approximate installation date, model information, past repairs, operation problems, and any visible interior staining. Take photographs from accessible indoor or ground-level locations. Ask the roofer and skylight specialist which observations need an on-site assessment. Do not decide that the glass, flashing, or surrounding roof is responsible for a leak solely from the location of an indoor stain.
Prepare two complete alternatives
Create a retain-and-reflash column and a replacement column. Ask the contractor to fill in the exact unit or retained components, surrounding roof work, interior finishing, controls if relevant, and the documents supplied at completion. Include responsibility for investigating existing staining before finishes are restored. If one alternative is unavailable for the existing model, ask for the reason in writing. Compare the whole scope rather than subtracting the price of a skylight box from a roof total.
Choose before the roofing sequence is fixed
Request a decision date that allows the selected unit and related components to be confirmed before work starts. Save the chosen product information or the documented decision to retain the existing unit. Ask how future service would affect the surrounding roof. The national roof calculator cannot price the skylight alternatives or establish the cause of a leak. Use a specific assessment and two clearly described scopes to decide which approach fits your project.
Putting it into practice
Two explicit alternatives make skylight retention a documented decision during reroofing. The comparison includes interior finishing and prior condition assessment, rather than reducing replacement to the purchase price of a new unit.
Sources and supported claims
VELUX discusses skylight replacement as part of reroofing.
Source ↗ · national · Checked 2026-10-12
VELUX distinguishes replacing an existing skylight from reflashing it during roof work.
Source ↗ · national · Checked 2026-10-12