Direct answer
If both windows and siding are being replaced, plan them together.
In many full exterior remodels, window replacement is completed before or during the siding work so the window flashing, water-resistive barrier, trim and siding can be integrated in the correct order. The exact sequence depends on the window type and installation method, but coordination is the key.
Why the order matters
Windows interrupt the drainage plane behind the siding. Sill flashing, side flashing and head flashing need to direct water onto the wall's water-resistant layer rather than behind it. When siding is already removed, the installer has much better access to inspect and integrate those details.
Why replacing siding first can create rework
If brand-new siding and trim are completed and the windows are replaced soon afterward, parts of the new exterior may need to be removed or disturbed to integrate the replacement windows correctly. That can add labor and make the finished detailing more complicated.
Does every window replacement require siding removal?
No. Some replacement-window methods are designed to work within the existing opening with limited exterior disturbance. Other projects involve the full frame and surrounding exterior details. That is why the window scope should be determined before deciding the siding sequence.
What if the siding is LP SmartSide?
With LP SmartSide or other engineered-wood siding, trim layout and clearances around windows are a major part of the finished appearance. Planning the windows first lets the exterior trim package be designed around the final window dimensions instead of adapting after the fact.
What if the siding is vinyl?
Vinyl siding also needs properly planned channels, trim and flashing around window openings. Because vinyl expands and contracts, fastening and accessory details around the opening matter in addition to the hidden water-management layers.
Best approach for a Minnesota exterior remodel
If your windows and siding are both aging, have Solaris look at both systems before committing to either project. A combined plan can identify hidden wall concerns, coordinate trim and colors, and avoid paying twice for the same access and exterior detailing.
Bottom line
If both projects are happening in the same general timeframe, do not treat windows and siding as unrelated purchases. Determine the window installation method first, then coordinate the siding, flashing and trim around that plan.
Research & Sources
- U.S. Department of Energy Building Science Education — Window Flashing. Describes sill, jamb and head flashing integrated with the drainage plane.
- ENERGY STAR — Detecting Air Leaks. Background on air leakage around windows and exterior openings.
General homeowner education only. Window installation methods and existing wall conditions vary by home.