You want new siding.
Your windows are only five years old.
Do they really need to come out too?
Usually:
No.
Siding replacement and window replacement are separate projects.
If your existing windows are:
- Structurally sound
- Performing properly
- Correctly installed
- Free from significant water problems
they may remain in place while the siding around them is replaced.
But there is one critical detail:
The new wall system still needs to manage water correctly around those existing openings.
Why Windows Make Siding Installation More Detailed
Every window interrupts the exterior wall.
That means installers need to correctly integrate:
- Weather-resistant barrier
- Flashing
- Window trim
- Siding accessories
CertainTeed’s installation guidance describes window flashing as part of the system used to divert water away from openings and integrate the window with the wall’s weather-resistant barrier.
So the issue is not:
“Can siding touch an old window?”
It is:
“How will water be managed around that window after the new siding goes on?”
When Should You Consider Replacing Windows at the Same Time?
Coordinating both projects may make sense if the windows already have:
- Failed glass seals
- Rot
- Major drafts
- Damaged frames
- Water intrusion
- Operational problems
If you were planning to replace them soon anyway, doing the work while the wall exterior is already open can simplify project sequencing.
But a healthy window should not automatically be removed simply because the siding is changing.
What Happens Around the Existing Window?
The siding installer may need to work with:
- Existing capping
- Brickmould
- J-channel
- Flashing
- Housewrap/WRB
- Trim
These components need to integrate in a way that allows water to move out—not behind the wall.
CertainTeed’s siding-installation guidance specifically describes flashing under, beside and above window openings to establish correct drainage.
Ask Before the Old Siding Comes Off
Before signing the contract, ask:
- Are my existing windows staying?
- How will you integrate the WRB around them?
- How will head flashing be handled?
- Is exterior window capping changing?
- What happens if hidden damage is found?
New Siding Doesn’t Automatically Mean New Windows.
But it does create an opportunity to make sure the window-to-wall connection is working correctly.
Envirotech provides both siding and window services, allowing homeowners to evaluate the two systems together without automatically replacing components that still perform properly.