Inward Opening Windows

— Continental Comfort, Exceptional Efficiency

Tilt-and-turn timber windows in three performance levels — from classic comfort to passive house standard.
Popular across continental Europe and increasingly chosen in the UK for their practicality, inward opening windows combine easy cleaning, secure ventilation and outstanding energy performance. The tilt-and-turn mechanism lets the sash tilt inwards for draught-free airflow or swing fully open — ideal for apartments, family homes and low-energy projects alike.
View technical specifications

Tilt & turn operation

secure ventilation and easy cleaning
from inside.

Three performance levels

IV68, IV78 and IV92 profiles,
up to passive house standard.

Internal glazing beads

glass secured from the inside
for enhanced security.

Triple glazing ready

whole-window U-values
down to 0.74 W/(m²·K).

Choose your performance level

IV68 — the versatile standard

A 68 mm profile with double or triple glazing, delivering excellent everyday insulation for renovations and new builds.

See specifications →

IV68

Renovation versions of our inward opening windows are also available.

IV78 — extra depth, extra performance

A deeper profile balancing structural strength and thermal efficiency — whole-window U-value of 0.85 W/(m²·K) (reference window).

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IV78

Renovation versions of our inward opening windows are also available.

IV92 — designed for low-energy living

Our deepest profile, suitable for passive house standard, achieving a whole-window U-value of 0.74 W/(m²·K) (reference window).

See specifications →

IV92

Renovation versions of our inward opening windows are also available.

View technical specifications

KaruzelaProduktowaInwardOpening1
KaruzelaProduktowaInwardOpening2
KaruzelaProduktowaInwardOpening3

Glazing unit:

24-34 mm

Pane:

UG = 1.0 – 0.8 W/(m²·K)

Spacer:

WARM

Material:

PINE JOINTED / MERANTI / OAK / SAPELE / ACCOYA

Fitting:

ROTO / GU / MACO

Handle:

COLOUR-MATCHED TO FRAME

Colour:

VARNISH COLORS / RAL / F&B

Silicone:

WHITE / BLACK / CLEAR / GREY / BROWN

Frame width:

68 mm

Download inward opening windows spec sheet (PDF)
KaruzelaProduktowaInwardOpening1
KaruzelaProduktowaInwardOpening2
KaruzelaProduktowaInwardOpening3

Glazing unit:

4-44 mm

Pane:

UG = 3.0–0.5 W/(m²·K)

Spacer:

WARM

Material:

PINE JOINTED / MERANTI / OAK / SAPELE / ACCOYA

Fitting:

ROTO / GU / MACO

Handle:

COLOUR-MATCHED TO FRAME

Colour:

VARNISH COLORS / RAL / F&B

Silicone:

WHITE / BLACK / CLEAR / GREY / BROWN

Frame width:

78 mm

Heat Transfer Coefficient:

0.85 W/(m²·K)

Download inward opening windows spec sheet (PDF)
KaruzelaProduktowaInwardOpening1
KaruzelaProduktowaInwardOpening2
KaruzelaProduktowaInwardOpening3

Glazing unit:

4-58 mm

Pane:

UG = 3.0–0.5 W/(m²·K)

Spacer:

WARM

Material:

PINE JOINTED / MERANTI / OAK / SAPELE / ACCOYA

Fitting:

ROTO / GU / MACO

Handle:

COLOUR-MATCHED TO FRAME

Colour:

VARNISH COLORS / RAL / F&B

Silicone:

WHITE / BLACK / CLEAR / GREY / BROWN

Frame width:

92 mm

Heat Transfer Coefficient:

0.74 W/(m²·K)

Download inward opening windows spec sheet (PDF)

CAD drawings available on request.

Inward opening windows in completed projects

Who we work with

Whatever the scale — from a single window to a multi-plot development — we tailor our joinery, logistics and support to the way you work.

Developers & investors

Serial orders for residential schemes, delivered on schedule and adapted to project specifications.

Architects & designers

Technical support at design stage, drawings and bespoke solutions for demanding briefs.

Builders & installation companies

Reliable lead times, transparent logistics and support from first survey to handover.

Private clients

Individually made windows and doors for homeowners who value authenticity and craftsmanship.

Heritage & conservation projects

Faithful recreation of historical joinery, in line with conservation requirements.

See our completed projects across the UK and Europe

View more projects

Tudor Revival Windows
— Surrey

The primary challenge in this architecturally distinct Arts & Crafts / Tudor Revival residence was replacing the extensive joinery across multi-faceted bay windows without compromising the period aesthetic or suffering from thermal inefficiency. The solution was the comprehensive installation of bespoke, dark-framed timber windows and doors with traditional glazing bars, combining meticulous period craftsmanship with advanced energy-efficient glazing. As a result, the striking deep graphite frames create a refined contrast against the pale render, delivering exceptionally warm and quiet interiors while significantly enhancing the property’s overall market value.

Location: Surrey

Year: 2024

Systems: Large Bay Windows, Casement Windows, French Doors (all bi-colour)

FAQ

Yes. We have been manufacturing for the British market since 2011 and our transports run to the UK every week. Delivery to London and the surrounding areas is included as standard for other regions delivery is quoted individually. Every order is packed to furniture-grade standard before despatch.
All products are made from engineered, multi-layer timber certified FSC® or PEFC, which ensures dimensional stability and resistance to warping. Available species: pine, oak, meranti, sapele, red grandis and Accoya.
Yes. We fit double and triple glazed units with low-E coatings and warm-edge spacers, with options including acoustic, toughened, laminated and ornamental glass, plus inter-pane or applied glazing bars.

We provide a 5-year guarantee covering the joinery construction, factory-applied coatings, glazing units and hardware (coatings without a UV filter carry a 2-year guarantee). Full guarantee terms are available on request.

One handle controls two functions: turn it one way and the sash tilts inwards at the top for secure, draught-free ventilation; turn it further and the whole sash opens inwards like a door — making cleaning both sides of the glass effortless, even on upper floors.
IV68 is our versatile standard for most homes and renovations. IV78 adds profile depth for higher thermal performance (Uw 0.85 for the reference window). IV92 is our deepest profile, suitable for passive and low-energy buildings, achieving Uw 0.74. Our consultants will help you match the profile to your project’s energy targets.
Yes. The glazing is secured with internal beads (it cannot be removed from outside), and multi-point locking from ROTO, GU or MACO engages around the full perimeter of the sash. The tilt position also allows ventilation without leaving the window open.
They offer performance that’s hard to match with traditional outward-opening styles: superior air-tightness, easy maintenance, and triple glazing as standard practice — which is why they’re the default choice in the most energy-efficient European homes.

Request a free,
no-obligation quote

Send us your dimensions, drawings or architectural documentation and our consultants will prepare a tailored offer.

We respond within 48 hours.
Request a quote
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Manufacturing timber joinery since 2011

FSC® & PEFC certified timber

PAS 24:2016 certified systems

5-year product guarantee

Weekly deliveries to the UK