Ask ten suppliers which window costs more and you will get ten versions of the same answer: tilt and turn costs more than casement. That is true but not useful. The question worth answering is which line items on the quotation are moving the number, because once you can see that, you can decide where to spend and where to hold. For contractors, developers and distributors specifying aluminium systems, that difference decides whether a project budgeted at casement pricing can be upgraded without giving up the margin.
This guide breaks the tilt and turn windows price gap into its component parts, compares the two types against real production specifications, and shows where the higher upfront figure is recovered over the life of the building.
Across European and UK retail cost guides, a tilt and turn unit is consistently quoted at roughly 20% to 40% above an otherwise equivalent casement window. Some UK installer data puts the gap wider, at 30% to 70%, largely because retail uPVC tilt and turn units in that market are frequently imported as complete systems rather than fabricated locally.
That premium is not a surcharge for a cleverer opening style. It buys a different hardware class, a different sealing strategy and a different machining tolerance. Remove any one of those three and the two window types converge on price very quickly — which is exactly why very cheap tilt and turn windows exist, and exactly why they tend to come back as complaints.
This is the single largest variable. A casement window needs a side hinge, a stay, an espagnolette and a handle. A tilt and turn sash needs a full-perimeter drive: corner drives, tilt pivots, a scissor stay, a locking strip running the whole sash, and a gearbox that switches between two distinct modes from a single handle position. The parts count is several times higher, and the parts themselves are load-rated differently.
Brand matters more here than anywhere else in the window. ROTO, Winkhaus, CMECH and Wehag publish cycle-test figures, and 30,000 cycles on a casement handle is a very different durability proposition from 30,000 cycles on a tilt and turn gearbox shifting a heavier sash between modes. When a project goes wrong mechanically, it is almost always here.
A casement sash transfers its load mainly through side hinges into the outer frame. A tilt and turn sash hangs on the hardware in two directions, so profile wall thickness and chamber geometry carry more of the structural work. ALPES builds both types on 6060-T66 alloy at 1.8 mm to 2.5 mm wall thickness with PA66GF25 polyamide insulation strips — the same material platform, but the tilt and turn sections are worked harder and machined more heavily.
A good casement window seals on two or three lines. The ALPES AW90 tilt and turn uses a dual-matrix eight-layer sealing system incorporating extended, composite, welded, threaded and dense sealing strips, with the glass centreline, thermal break strip and equal-pressure gasket aligned on a single isothermal axis. More sealing lines means more material, more fitting time and more quality control — but it is also the reason the AW90 reaches a K-value of 1.3.
Tilt and turn sashes accept deeper glazing units. The AW90 carries a 90 mm glass sash; the C116 casement takes 81 mm; the C120 takes 62 mm. Deeper glazing means better thermal and acoustic performance, and it also means a heavier sash, heavier-duty hardware, more packing care in the crate, and a higher landed freight cost per unit. Buyers comparing quotes per window without checking glazing build-up are not comparing the same product.
Tilt and turn requires tighter milling tolerances and longer setup per unit. Frame, mullion, sash and screen on the AW90 all go through a full injection-adhesive bonding process, and corners are reinforced and completely sealed rather than mechanically crimped. That is a slower line and a higher labour content per window.
Published UK installer data puts casement fitting at roughly one to two hours per window and tilt and turn at two to three. Inward-opening sashes also need clear interior reveal depth to swing, and on heavier units the surrounding structure may need checking. That is a real cost on site, not a rounding error, and it should be quoted separately from the window itself.
| Factor | Casement Window | Tilt and Turn Window |
|---|---|---|
| Opening modes | One (inward or outward swing) | Two (inward tilt plus inward turn) |
| Hardware parts count | Low to moderate | High, full-perimeter drive |
| Sealing lines | Two to three typical | Up to eight on premium systems |
| Space required | Exterior or interior swing clearance | Interior clearance and clear sill |
| Exterior cleaning | Requires external access on upper floors | Both faces reachable from inside |
| Secure night ventilation | Limited; an open sash is an entry point | Strong; tilt position stays locked and rain-safe |
| Installation time | Shorter | Longer, needs more precise setting |
| Upfront unit cost | Lower | Higher, typically 20% to 40% above |
Abstract cost comparisons are easy to argue with. Actual production numbers are not. The three ALPES systems below are built on the same alloy and the same insulation strip material, so the differences you see are the differences you are paying for.
| Specification | C120 Casement | C116 Casement | AW90 Tilt and Turn |
|---|---|---|---|
| Alloy grade | 6060-T66 | 6060-T66 | 6060-T66 |
| Profile thickness | 1.8 to 2.0 mm | 1.8 to 2.0 mm | 1.8 mm |
| Thermal K-value | 1.6 | 1.7 | 1.3 |
| Frame wall width | 119 mm | 116 mm | 90 mm |
| Glass sash thickness | 62 mm | 81 mm | 90 mm |
| Opening method | Outward | Outward | Tilt and turn, inward |
| Hardware | ROTO transmission box, anti-pry lock points | CMECH, optional Wehag upgrade | Winkhaus, optional C-slot ROTO |
| Sealing | Injection-moulded structural adhesive, full corner sealing | Triple sealing strips, seamless welded corners | Dual-matrix eight-layer sealing |
Read that table as a cost map rather than a spec sheet. The AW90 reaches a K-value of 1.3 on a narrower 90 mm frame, because tilt and turn geometry compresses the sash against the seals instead of relying on frame depth to build thermal resistance. The C-series casements reach 1.6 and 1.7 using wider frames and far less hardware. Both are correct answers — they are answers to different questions. If your project is chasing a thermal target, casement window price stops being the relevant comparison and K-value per millimetre of frame depth starts being the one that matters.
The difference between a K-value of 1.7 and 1.3 is not a rounding error when it is multiplied across a full facade on a cooling-dominated villa in Saudi Arabia or Dubai. Every increment of thermal resistance reduces the load the mechanical system has to handle, and on large glazed elevations that shows up in equipment sizing as well as in running cost.
Outward-opening casements on upper floors need exterior access to clean: scaffolding, cradles, rope access or a specialist contractor. On a mid-rise or high-rise project that is a recurring cost that never appears in the window quotation. A tilt and turn sash brings both glass faces inside, and for building owners that alone can turn the lifecycle calculation around.
Most tilt and turn failures trace back to one of two causes: hardware specified below the sash weight, or a sash machined outside tolerance so the locking points never fully engage. Neither is a fault of the opening type. Both are what you get when the premium is removed by cutting the hardware budget instead of the margin. Specifying branded hardware with a published cycle rating and buying from a manufacturer that tests its own assemblies is what separates a 25-year window from a five-year problem.
The 20% to 40% premium quoted in consumer cost guides is a retail figure. It carries showroom overhead, distributor margin and installer margin stacked on top of the manufactured cost. A B2B buyer sourcing by container from a manufacturer with its own 100,000 m² production capacity across two centres is buying the profile and the hardware, not the showroom.
This matters more for tilt and turn than for any other window type, because hardware is both the most expensive component and the one most exposed to distributor markup. Factory-direct sourcing compresses the gap between the two types back down to the genuine manufacturing difference. Working with an established casement window manufacturer that produces both systems on the same line is also the only reliable way to get a like-for-like quote, since profile, glazing and finish stay constant and only the opening hardware changes.
For comparable profile, glazing and hardware brand, yes. The gap narrows considerably when the casement is upgraded with premium hardware and deep triple glazing, and it widens when the tilt and turn is specified with top-tier European hardware.
The hardware-driven portion applies to both, since it is the same mechanism. In aluminium the profile cost is higher across the board, so the premium represents a smaller share of total unit cost than it does on a low-cost uPVC frame.
Not when they are correctly specified and installed. The multi-point locking and compression sealing make them inherently more airtight than a standard casement. Reported leaks are usually drainage-path or installation faults rather than a flaw in the opening type.
Tilt and turn. Side hinges carry the full sash load at one edge and will eventually sag under heavy glazing; tilt and turn hardware distributes the load around the sash perimeter and keeps large panels operating correctly for longer.
Casement windows remain the better value where budget is the binding constraint, openings are standard, and exterior cleaning access is straightforward. Tilt and turn earns its premium where energy performance targets are tight, upper-floor cleaning access is expensive, secure ventilation is required, or large sashes need to stay true over decades.
The mistake is comparing headline unit prices across two windows that were not specified to the same standard. Fix the glazing, the hardware brand and the thermal target first, then let the two opening types compete on equal terms. Send ALPES your opening schedule and performance targets, and you will receive an itemised quotation for both systems from the same production line.
