When enlargement becomes part of the job
An existing opening may be too small or poorly positioned for the intended window and room use. Enlargement changes the foundation opening itself. It can involve cutting below or beside the old opening, removing the old assembly and rebuilding the surrounding details.
What the installer needs to inspect
The wall material and condition, support above the opening, interior floor relationship, exterior soil level and nearby obstructions affect the proposal. The installer should also assess whether the existing well and drainage can remain. Do not assume an old well will fit a larger window.
Keep replacement and enlargement prices comparable
Ask the quote to state whether foundation cutting is included, the proposed window model, what happens to the old frame, and whether the well is replaced or modified. Include interior wall and trim repairs, hauling, weather sealing and any structural review. An estimate for swapping a window does not cover the same work as enlarging its opening.
Resolve room-use and permit requirements first
Tell the contractor if this is part of a bedroom conversion or basement remodel. Have the proposed arrangement checked against current local requirements before ordering materials. The Cedar Rapids permit guide explains where to start.