Description
Four projection depths run across the white oversill line on a single 2.5 m length, and the 140 mm is the second step in that ladder. It sits in the white and anthracite oversill and verge trim collection at Renders World, alongside the matched end caps and the anthracite profiles at the same depths.
Where the 140 mm White Oversill Fits, and Why Buyers Pick This Depth
The Over sill white 2.5m 140mm depth is listed by Renders World at £23.90 for a 2.5 m length, August 2026, and extends a window sill outward once insulation and render close over the original one. Its job is to carry the drip edge clear of the new finished wall face so rainwater leaves the opening instead of tracking back down the render.
That makes depth the whole decision, and depth is the one thing this listing settles precisely: 140 mm of projection, the second of four white steps. What the projection needs to clear is a project figure, taken from the build-up on the wall and the system supplier's detail, which is why the four depths below are compared on price and step size rather than on an insulation band.
- Second step in a four-depth ladder: at £23.90 it is £3.00 above the shallowest white profile, the smallest step in the range and the usual first move up from it.
- One 2.5 m length per opening: where a single profile spans the opening, the trim line stays joint-free and there is no intermediate seam to seal or to see.
- One colour across every depth: a mixed-depth elevation still reads as a single white trim line, which matters where fascia and rainwater goods are already white.
- Matched white end caps in stock: the white sill and verge end cap pair is a listed item at £5.90, August 2026, so the termination is not a special order.
- Priced per profile, carriage quoted afterwards: a multi-window job can be costed on materials first, with the delivery method settled by the team once the order is in.
White Oversill Specification: What the Store Record Confirms and What It Does Not
This audit publishes only what was read live this session. Where a property was previously asserted without a retrievable source, the table says so plainly rather than repeating it, and names the route to a firm answer.
| Property | Position, August 2026 |
|---|---|
| Listed title | OVER SILL WHITE 2.5m 140mm DEPTH |
| Colour | White |
| Projection, from the product name | 140 mm |
| Length, from the product name | 2.5 m |
| Price | £23.90 per profile, product record, August 2026; no VAT treatment displayed with the figure |
| Availability | Listed as available to order; this depth is not stock-counted in the record, so confirm quantity for a full-facade order |
| Material and gauge | Not stated in the product record, and no manufacturer sheet was retrievable this session |
| Insulation build accommodated | Not published here — a manufacturer and project figure, not a house figure |
| Overhang, fall and fixing centres | Not published here — taken from the system supplier's sill detail |
| End caps | Separate item, white pair, £5.90, August 2026 |
| Delivery | Site-wide policy applies: courier, pallet or company van, kerbside, carriage confirmed after the order |
Three Renders World pages have quoted different insulation bands against this depth, and no supplier document was reachable to settle them, so the band has been removed rather than picked. The practical instruction is short: measure the finished build on the wall — adhesive, board, basecoat and finish — and send that figure to the technical desk with the elevation's exposure before committing to a depth, which gets you a defensible answer in one call.
How to Install the 140 mm Oversill in the Render Sequence
Fitting an oversill is a sequencing job more than a fixing job, and the order below is the one that keeps the water path continuous and the visible face clean.
- Confirm the depth against the wall, not the drawing, since measured board and render thickness on site can differ from what was specified.
- Set the outward fall before fixing, so water runs off the front edge rather than standing on the profile or working back toward the substrate.
- Bed the back upstand in a continuous neutral-cure silicone line against the original sill — one uninterrupted bead, rather than spots, is the watertight detail.
- Fix mechanically along the upstand at the centres the system detail gives for the build-up in use.
- Close both ends with the white cap pair and tool the joint, so each cut end is finished and sealed in the same action.
- Where the profile arrives with a protective film, leave it on through basecoat and topcoat, then peel it once the render has cured; cementitious splash is far easier to prevent than to lift off a pale finish.
The oversill is one junction in a wider reveal treatment, with jamb terminations and external arris points handled by stop bead profiles and corner bead profiles respectively. For the order of work in full, the window sill extension fitting guide walks through measuring and cap closure, and the guide to render detailing at windows and doors covers how the profiles around an opening coordinate.
Choosing Between the Four White Oversill Depths and What Each Costs
All four share the 2.5 m length, the white finish and the same end cap pair, so depth and price are the only variables between them. Every figure was read from the product records in August 2026, is material cost only, and carried no displayed VAT treatment.
| Profile | Depth | Price, Aug 2026 | Step from this depth |
|---|---|---|---|
| 110 mm white oversill | 110 mm — shallowest | £20.90 | −£3.00 |
| Over sill white 2.5m 140mm depth (this profile) | 140 mm | £23.90 | — |
| 170 mm white oversill | 170 mm | £27.90 | +£4.00 |
| 220 mm white oversill | 220 mm — deepest | £30.40 | +£6.50 |
Across the range the spread is £30.40 − £20.90 = £9.50 between shallowest and deepest, so depth is a modest line on a materials budget and there is little to gain from specifying short. On this profile the rate works out at £23.90 ÷ 2.5 m = £9.56 per linear metre, which is the figure to carry into a quantity take-off across several openings.
Working Out Quantities, Caps and Carriage Before You Order
Quantities on oversills are counted by continuous runs rather than by windows, and the caps are the item most often left off an order.
- One profile plus one cap pair per run: £23.90 + £5.90 = £29.80 in materials for a single opening, before sealant and fixings.
- Count caps by runs, not by openings: a bay made from three separate sections takes three pairs, while one window closed by one length takes one.
- Match the cap to the colour of the run: the white pair goes with white profiles, and the anthracite pair with anthracite, both listed in the same collection.
- Confirm the cap seats on this depth with the desk when you order, since no manufacturer document for the pairing was retrievable this session.
- Carriage is quoted, not calculated: the Renders World shipping policy covers courier despatch for small parcels up to 25 kg next day, pallet service and local company van delivery, all kerbside, with the method confirmed by customer service after the order because the store cannot price carriage automatically across products of this size range.
Collection from Southampton remains one route among those options rather than the only one, so a long profile can still be planned into a delivery with the rest of a system order — the reinforced layer and the thin-coat silicone render that finish over the trim included.
Is the 140 mm White Oversill the Right Depth for Your Elevation?
- Modest build-ups on a white trim scheme: a sound choice where the finished wall face sits comfortably inside the 140 mm projection and the elevation already runs white fascia, gutters and frames.
- Where the projection is marginal: step up to the 170 mm white oversill for £4.00 more, since extra drip clearance is cheaper bought than retrofitted.
- Where the build is genuinely slim: the 110 mm white oversill keeps the trim proportionate to the wall and saves £3.00 per opening.
- Dark or contrast trim schemes: the anthracite profiles at all four depths sit in the same oversill and verge trim collection, and matching cap colour at order stage beats painting a cap afterwards.
FAQ — Fitting, Quantities and Depth Choice on White Oversills
How do I know 140 mm is deep enough?
Add up the full build you are applying — adhesive, board, basecoat and finish — then check that the 140 mm projection clears that figure with the drip margin your system detail asks for. Because the required margin is a manufacturer figure this page could not source, and because Renders World pages have quoted different insulation bands against this depth, the reliable route is to send the build-up and the elevation's exposure to the technical desk before ordering.
How many profiles and caps does one window need?
One 2.5 m length covers most domestic openings without a joint, and one cap pair closes that run at both ends.
- Single opening, one length: one profile and one pair, £29.80 in materials.
- Bay or wraparound in three sections: three profiles as measured and three pairs.
- Opening wider than a single length: plan the joint away from the visual centre of the window.
How does the 140 mm compare with the 220 mm?
They share length, colour and caps, and differ by 80 mm of projection and £6.50 in price — £23.90 against £30.40 in August 2026. The deeper profile exists for thicker build-ups, and because the price gap is small, the choice is better made on measured build depth than on cost; the 220 mm white oversill is the one to price up if your build-up is at the deep end of a retrofit.
How does an oversill differ from a verge trim at the same depth?
By the direction of the return. An oversill turns down at the front to shed water clear of the wall below an opening, while a verge trim turns up at the back to terminate the system against a fascia or coping. They share colour, length and end caps, do opposite jobs, and are not interchangeable.
Does the projection matter on a sensitive facade?
It changes the proportions of the window detail, so on a listed building or in a conservation area it is worth showing the profile on elevational drawings and raising it with the local planning authority at design stage. That conversation is straightforward early and awkward once the scaffold is up.