Description
The Over Sill White 2.5m 220mm Depth is the deepest white window sill extension in the range. It is laid over the existing sill after external wall insulation and render have built the wall out, so the new sill reaches past the finished face. Each piece is 2.5 m long, and it shares its white with the matching verge trim and end cap pair.
Six Reasons to Choose the 220 mm Depth
- The most reach in white. The Over Sill White 2.5m 220mm Depth is the deepest of the four white depths.
- One piece per opening up to 2.5 m. A shorter window takes one length cut to size.
- A matching white trim line. The white verge trim and the white end cap pair complete the scheme in one colour.
- A dark version of the same depth. The 220 mm depth is also listed in anthracite.
- Three shallower steps beside it. If the openings on one house differ, 110, 140 and 170 mm sit in the same white family.
- Checked by the counter first. Phone in two measurements from site and the depth is agreed with you before the order goes in.
What You Get With the Over Sill White 2.5m 220mm Depth
An over sill — the trade also says oversill, window sill extension or sill extender — caps the old sill so rainwater runs off beyond the new, thicker wall. The picture shows the white family shape: a flat sill board, a short upstand along the back and a turned-down front edge, with an end cap fitted at each end.
| Property | This over sill |
|---|---|
| Colour | White |
| Depth | 220 mm, the deepest of four |
| Length | 2.5 m per piece |
| Shape | Flat board, back upstand, turned-down front |
| End caps | Sold as their own item: the white pair |
| Matching trim | White verge trim with upstand, 2.5 m, 140 mm |
Where 220 mm Sits in the Range
Eight over sills, one length — choose the depth in the left column, then the colour.
| Depth | White | Anthracite |
|---|---|---|
| 110 mm | White 110 mm over sill | Anthracite 110 mm over sill |
| 140 mm | White 140 mm over sill | Anthracite 140 mm over sill |
| 170 mm | White 170 mm over sill | Anthracite 170 mm over sill |
| 220 mm | This over sill | Anthracite 220 mm over sill |
Measuring for the Depth
A deep sill is not automatically the safe choice — the right depth is the one that fits the wall. At every opening, note two things.
- Build-up: the combined thickness of insulation and render at the window, measured on the wall itself.
- Old sill: the distance the existing sill stands proud of the current wall face.
Read both numbers to the Renders World counter on 023 8200 2442 and the depth is settled with you before you order. Different openings on the same wall get their own pair of numbers.
Lengths and Caps per Opening
Take the width of each sill, divide by 2.5 m and round up.
- A 2.1 m opening is one length cut down.
- A 3.6 m opening is 3.6 ÷ 2.5 = 1.44, so two.
- Caps follow the ends, not the lengths — one white pair for each sill open at both ends.
Before ordering for a sill longer than 2.5 m, agree with the counter how the two pieces will meet.
The White Trim Family
The white side of the range:
- Over sills — 110, 140, 170 and this 220 mm depth.
- Verge trim — the white verge trim with upstand for the wall head.
- End caps — the white end cap pair, listed for both.
White or Anthracite
Match the frames.
- White frames — the Over Sill White 2.5m 220mm Depth with the white trim.
- Dark frames — the same depth as the anthracite 220 mm over sill, closed with the anthracite cap pair.
Fitting the Over Sill
- Measuring, cutting and closing a run — how to install window sill extensions.
- Sill, beads and render at the reveal — render detailing around door and window openings.
- Every trim and cap together — the window sill extensions and oversills page.
Ordering, Delivery and Returns
- Dispatch — Renders World processes orders the same day when the stock is there; order the white cap pairs together with the lengths.
- Delivery — quoted by the team after the order; parcels up to 25 kg go next day, always kerbside.
- Collection — from the counter at Unit 9A, Central Trading Estate, Southampton SO14 5JP, Monday to Friday 7am to 5pm and Saturday 7am to 12pm.
- Returns — goods bought directly from Renders World can go back within 14 days in their original condition; special orders and promotion purchases are excluded.
FAQ
Which insulation thickness does the 220 mm depth suit?
It depends on each opening. Give the counter on 023 8200 2442 the insulation-and-render thickness and the projection of the current sill, and the depth is agreed before you order.
Does the picture show the 220 mm profile?
It shows the shape shared by the four white depths. The piece you receive is 220 mm, as named in the title.
What shape is the profile?
A flat white board with a short upstand at the back and a turned-down front edge; an end cap closes each end.
Is it an internal window board?
No. It is an external sill extension, laid over the outside sill of an insulated and rendered wall.
Is there a deeper white over sill?
No. The Over Sill White 2.5m 220mm Depth is the deepest of the four white depths in the range.
Is the 220 mm depth sold in anthracite?
Yes, as the anthracite 220 mm over sill, closed with the anthracite end cap pair.
Are end caps included?
The end caps are sold as their own item, the white pair. Allow one pair for each sill with two open ends.
How many lengths does a 4.5 m opening take?
Two: 4.5 ÷ 2.5 = 1.8, rounded up. Agree with the counter how the two lengths will meet before you order.