Step-by-step fix
Step 1: Confirm the grate is the part that needs replacement
- Look into the window well and find the drain opening at the bottom.
- Check whether the grate is cracked, rusted through, bent, missing, or loose enough to let debris drop into the drain.
- Make sure the drain opening itself is still intact and not broken around the edges.
- If the grate is only buried under leaves or gravel, uncover it fully before deciding to replace it.
If it works: You have confirmed the grate is damaged, missing, or no longer staying in place.
If it doesn’t: If the grate is fine but water still stands in the well, the real problem is likely a clogged drain or poor drainage around the well rather than the grate itself.
Stop if:- The drain opening is broken apart, collapsing, or separated from the surrounding base.
- The window well wall is loose, badly rusted, bowed, or pulling away from the house.
- You find signs of foundation leakage or water entering the basement around the window.
Step 2: Clear the well and expose the drain opening
- Put on gloves and remove leaves, mulch, stones, and any loose trash from the bottom of the well.
- Use a hand scoop to pull back enough gravel or soil to fully expose the drain opening and its edge.
- Place debris in a bucket instead of piling it beside the opening where it can fall back in.
- Brush the area around the drain so you can see how the old grate sits and how the new one needs to fit.
If it works: The drain opening and surrounding edge are clean and easy to access.
If it doesn’t: If the opening keeps filling with muddy water or packed silt as you clear it, clean out as much as you safely can before installing the new grate.
Stop if:- You uncover a hidden void, washed-out soil, or a sinkhole-like area around the drain opening.
- The bottom of the well feels unstable or continues collapsing as you remove debris.
Step 3: Remove the old grate and measure for the replacement
- Lift out the old grate by hand if it is loose.
- If it is stuck, use a flat screwdriver or pry tool gently at the edge without chipping the drain opening.
- Measure the length and width or diameter of the opening the grate covers.
- Compare those measurements with the new grate and make sure the new part will sit flat without rocking or dropping into the opening.
If it works: The old grate is out and you know the new grate matches the opening.
If it doesn’t: If the replacement does not match the opening shape or size, pause and get the correct grate before installing anything.
Stop if:- The old grate is fastened in a way that requires cutting metal or breaking concrete to remove.
- The drain rim is too damaged to support a new grate securely.
Step 4: Clean the seat for the new grate
- Brush dirt, rust flakes, and packed grit off the rim or ledge where the grate will rest.
- Scrape away any stubborn buildup that keeps the new grate from sitting flat.
- Remove loose gravel from the immediate area so the grate will not wobble after installation.
- Dry-fit the new grate once to check that it sits evenly and covers the opening fully.
If it works: The new grate sits flat and stable during the test fit.
If it doesn’t: If the grate rocks or leaves gaps, clean the rim again and recheck the fit before moving on.
Stop if:- You cannot get a stable fit because the drain edge is broken, uneven, or missing support.
Step 5: Install the new window well drain grate
- Set the new grate in place so it fully covers the drain opening.
- If the grate uses simple clips or tabs, press it into position according to its basic fit design without forcing it.
- Make sure the grate cannot tip, slide aside easily, or fall into the opening.
- Return any surrounding gravel carefully, keeping the top of the grate exposed so water can enter and debris can be seen and removed later.
If it works: The new grate is seated securely and the opening is protected.
If it doesn’t: If the grate will not stay put, remove it and confirm you have the correct size and style for that drain opening.
Stop if:- The only way to make the grate stay in place would be an improvised setup that blocks drainage or creates a trip hazard.
Step 6: Test drainage and make sure the repair holds
- Pour a bucket of clean water into the well near the drain, not directly against the window.
- Watch to see that water reaches the grate and drains through without backing up around it.
- Check that the grate stays in place while water flows and does not shift under light foot-free contact from the water stream.
- Recheck the well after the next rain to make sure the grate is still seated and the opening is not collecting debris again.
If it works: Water drains away, the grate stays put, and the well remains clear in normal use.
If it doesn’t: If water still stands in the well, the drain line below the grate likely needs cleaning or further diagnosis.
Stop if:- Water backs up immediately even though the grate is clear, suggesting a blocked drain below.
- The well fills rapidly during testing or rain and threatens the window or basement.
Replacement Parts
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
FAQ
Do I need to replace the grate if it is only dirty?
No. If the grate is intact and still fits securely, cleaning it and clearing the well is usually enough. Replace it when it is broken, badly rusted, bent, missing, or no longer stays in place.
How do I know which replacement grate to buy?
Match the opening shape and size first. Measure the drain opening carefully and compare it to the replacement so the grate covers the opening fully and sits flat on the surrounding edge.
Can I use a makeshift cover instead of a proper grate?
It is better to use the correct grate. Improvised covers can block drainage, shift out of place, or let debris slip into the drain anyway.
Why is there still standing water after I replaced the grate?
A new grate only protects the drain opening. If water still stands in the well, the drain below may be clogged, the well may be filling with silt, or outside grading may be sending too much water toward the window.
Should the grate sit above or below the gravel?
The top of the grate should stay exposed. If it gets buried, debris can collect over it and water may not reach the drain as easily.