Funding, delivery, measuring, FAQ

Everything important about funding eligibility, delivery terms, measuring and frequently asked questions – compact & transparent.

Funding eligibility

Whether a window is eligible for funding generally depends on the Uw value of the entire window (frame + glass). From Uw ≤ 0.95 W/m²K, funding is often possible. Below is a guide to efficiency classes:

Class
Uw
Classification
A+++
Uw ≤ 0.80
very good windows
A++
Uw ≤ 0.85
very good windows
A+
Uw ≤ 0.90
very good windows
A
Uw ≤ 0.95
good windows
B
Uw ≤ 1.00
good windows
C
Uw ≤ 1.10
good windows
D
Uw ≤ 1.20
standard windows
E
Uw ≤ 1.30
standard windows
F
Uw ≤ 1.40
standard windows
G
Uw ≤ 1.50
standard windows
Note: The table is for guidance only. Funding programmes may change; the programme conditions of the respective funding body (e.g. KfW/BAFA) are binding.

How do I get funding?

  • Include energy advice: Have your existing building checked by a certified energy consultant. They will assess whether your project and building situation meet the requirements.
  • Uw certificate from manufacturer: For funding-eligible windows (e.g. from Uw ≤ 0.95) and sliding doors you will receive suitable product documentation/certificates.
  • Funding body & application: Application (often before placing the order!) is made by you – partly via energy advice/portal of the funding body.

We are happy to advise you on our products and typical Uw values. Please note: We cannot submit applications or make commitments. The application and compliance with all requirements is entirely your responsibility and depends on the conditions on site.

Delivery terms
  • Delivery by 40-tonne lorry: Regardless of order size, delivery is made with a large lorry. Please ensure that access, parking and unloading area are sufficient.
  • Equipment: The lorry has a forklift – no crane. The forklift must be able to move on the premises.
  • Delivery date: The agreed date is binding as tours are scheduled. If delivery is not possible (no access, nobody on site) additional costs may arise.
  • Rare delays: In exceptional cases the lorry may not appear despite notification (traffic, delays on the tour, legal driving/rest times). We ask for your understanding – we have no influence on this. We will inform you as soon as possible.
  • Complete delivery: Orders are delivered together; delivery time therefore depends at least on the longest item in your order.
Fensterwerke³ – professional unloading with forklift at 40-tonne lorry

Guide: measuring correctly

No worries – with this step-by-step guide you can determine the right dimensions. Always measure in millimetres (mm) and note width × height. Check at several points – the smallest value counts.

Windows (replacement in existing building)

  1. Clarify type: Are we measuring in the shell (wall opening) or is an old window already installed (replacement)?
  2. Measure width: Measure inside the reveal left, centre, right from masonry to masonry. Note the smallest value.
  3. Measure height: Measure inside left, centre, right from lintel to sill/parapet (or floor in shell). Note the smallest value.
  4. Deduction: Deduct 10–20 mm total (depending on building condition) from width/height for installation joint. Standard: 10 mm clearance per side.
  5. Check dimensions: Are reveals crooked? Measure diagonally – note large deviations.
  6. Installation height & connections: Consider sill, roller shutter guide, insulation, frame bearing (e.g. 30 mm).
  7. Result: Order dimension = smallest wall opening – deduction (per direction).

Tip: For renovation, a quick photo of the reveals with dimensions is worthwhile – helps avoid misunderstandings.

Sliding doors (e.g. lift-slide or PSK doors)

  1. Measure width: Measure wall-to-wall top, centre, bottom. Note the smallest value.
  2. Measure height: Measure from lintel to top of finished floor (OFF). Consider planned threshold/floor build-up.
  3. Deduction: Deduct at least 15–20 mm total for joint and seal (all round, less at bottom depending on threshold).
  4. Threshold & drainage: Low-threshold designs need a clean subfloor, consider gradient/waterproofing.
  5. Opening direction & fixed part: Define when viewed from inside (e.g. "panel runs to the right").
  6. Result: Order dimension = smallest wall opening – deduction. Please contact us if unsure.

Note: Large elements are heavy – check the access route and placement area for delivery/the forklift.

Front doors (entrance doors)

  1. Measure width: Measure wall-to-wall top, centre, bottom. Note the smallest value.
  2. Measure height: Measure from lintel to top of finished floor (OFF). Consider planned threshold or floor build-up.
  3. Deduction: Deduct at least 15–20 mm total for joint and seal (all round). Less at bottom depending on threshold type.
  4. Threshold: For barrier-free threshold check subfloor and gradient. For higher threshold consider waterproofing.
  5. Opening direction: Define when viewed from inside (door opens left or right).
  6. Result: Order dimension = smallest wall opening – deduction. Please contact us if unsure.

Note: Front doors are large and heavy – check access route and placement area for delivery.

Important: Dimension survey is the responsibility of the builder/customer. We check plausibility but cannot guarantee on-site openings without an on-site survey.

Frequently asked questions FAQ

Answers to the most common questions about funding, ordering, delivery and warranty.

How can I configure and order windows online?
In the window configurator you select dimensions, profile, glazing and colour of your plastic windows made to measure. After configuration you receive a transparent quote and can buy your windows directly online.
How long does the configuration take?
Minimal configuration: Only 5 minutes! Perfect for a quick start without prior experience. Full configuration: 10-15 minutes for detailed information with all options. The actual duration depends on your project scope, but our configurator is optimised so that you get to your quote as quickly as possible.
Is the configurator easy to use?
Yes, definitely! Our configurator is specially developed for maximum user-friendliness. In just 5 minutes to a complete configuration - without any prior experience! Even without prior knowledge you can get a complete quote with minimal input. Two modes to choose from: Minimal ('Quick & Easy') guides you intuitively through the most important steps – Full ('For experts') offers all detailed input options.
Do I need prior experience for the configurator?
No! Absolutely no prior experience needed. Our configurator is designed so that first-time users are also guided intuitively through the process. Helpful tooltips, visual selection and automatic validation support you at every step. You don't need to be an expert - we make it as easy as possible for you!
Do I have to fill in all fields in the configurator?
No! Our configurator offers flexible input options. You can choose between two options: Minimal details (Quick & Easy): Basic details are enough for a first quote. Ideal if you want to get an overview first or don't yet know all details. Full configuration (For experts): If you already know all details, you can create a full configuration. This leads to more precise quotes and faster processing. Both options lead to a binding quote!
What contact details are needed for a quote?
We are flexible here too: Minimal contact details (We recommend): Name and email address are sufficient for a first non-binding quote. We also recommend a phone number for follow-up questions. Full contact details (You know exactly): If you want to start directly, you can also provide full address, project details and timeframe. This enables faster project processing and fewer delays. You decide how much to provide!
What delivery times apply for windows and sliding doors?
Delivery time is usually 3–4 weeks after payment receipt, depending on profile, colour and fittings. Through our direct sales we guarantee short delivery times for windows, doors and sun protection.
What payment methods do you offer? Is instalment payment possible?
We accept all common payment methods: credit and debit card, PayPal, Apple Pay, Google Pay, bank transfer, SEPA direct debit, iDEAL and Klarna. Instalment payment is possible via PayPal instalments or Klarna instalments – pay comfortably in several instalments.
What is the difference between roller shutters and Venetian blinds?
Roller shutters offer complete darkening, privacy and burglary protection. Venetian blinds (louvers) allow flexible light control via adjustable slats – ideal for modern living with daylight regulation.
What sun protection systems do you offer?
We offer roller shutters (built-on and external) and Venetian blinds (built-on and external). Both systems are available manually, with radio control or as a smart home solution with weather automation.
Are the sun protection systems compatible with smart home?
Yes, both roller shutters and Venetian blinds can be combined with radio or smart home systems. Weather automation can optionally be integrated – for maximum comfort and energy efficiency.
Can I install sun protection afterwards?
Yes, you can retrofit roller shutters or Venetian blinds. We are happy to advise you on the right installation type and compatible smart home controls.
Which window manufacturers do you offer?
We carry plastic windows from Salamander (greenEvolution, bluEvolution), Aluplast (Ideal 5000, Ideal 8000), Gealan (S 8000, S 9000) and Rehau (Synego) – all known for energy efficiency and brand quality.
What is the difference between the window profiles?
Profiles differ in construction depth (70–92 mm), number of chambers (5–7) and insulation values. Salamander bluEvolution 92 offers maximum insulation, while Aluplast Ideal 5000 is compact for renovations. All models are funding-eligible.
What sliding doors do you have in your range?
We offer high-quality lift-slide doors from four premium manufacturers: Salamander: Evolution Drive Smart (smart home capable) & Evolution Drive 82 (5-chamber, Uw 0.74 W/m²K). Aluplast: HST 85 (6-chamber, Uw 0.80 W/m²K, 85mm construction depth). Gealan: HST (5-chamber, Uw 0.84 W/m²K, 85mm construction depth). Rehau: Synego HST (5-chamber, Uw 0.86 W/m²K, 80mm construction depth). All systems have 1-2 tracks, optional low thresholds, are funding-eligible and available in many RAL colours.
Which sun protection manufacturers do you use?
For roller shutters we work with Aluprof (SK90, SK45, SKO-P, SKP), Beck+Heun (Roka Top 2 RG/EX) and EXTE/ROKA (Expert XT). For Venetian blinds we use Aluprof (RAFF-Basic, RAFF-I) and Beck+Heun (Roka Top 2 Shadow EX).
What glazing options are available?
Choose between double and triple glazing with Ug values from 0.5 W/m²K. Optional: ESG, VSG, frosted glass, sound insulation or sun protection glass for maximum energy efficiency.
What colours and surfaces are possible?
Over 200 colours and designs to choose from: RAL colours, wood looks (oak, walnut, pine), metallic designs and special colours. Inside and outside can be combined individually. All surfaces are weather-resistant and easy to care for.
How does the online configuration work?
In the window configurator you select manufacturer, profile, dimensions, glazing and colour. The system automatically checks technical parameters and immediately shows suitable options. You then receive a detailed, fair quote.
What warranty do you offer?
You receive 5 years warranty on all products. In addition, the manufacturer warranties of Salamander, Aluplast, Gealan and Rehau apply. The warranty covers material and processing defects.
Can I also order individual parts or accessories?
Yes, you can order individual parts such as fittings, seals, handles as well as accessories like insect screens, window sills or roller shutter boxes directly from us. We are happy to create an individual quote for you.
From when are windows funding-eligible?
Windows are often considered funding-eligible when the Uw value is ≤ 0.95 W/m²K. However, the conditions of your funding programme (e.g. KfW or BAFA) are decisive.
Who provides the documents for the Uw certificate?
You receive the product-related Uw certificates directly with the quote or order. For submission to the funding programme please contact your energy advice or the responsible funding body.
How long does delivery take?
Delivery time depends on the chosen configuration and material. As all items are delivered together, the longest delivery time applies. You will receive concrete time windows with the quote.
Do I need helpers on site?
Unloading is done by forklift. Please ensure clear access and a suitable placement area. We are happy to advise on structural particularities.
What additional equipment is possible?
We offer numerous options for windows, sliding doors and sun protection: Insect screens: integrated or retrofittable. Window sills: inside/outside, various materials. Interior blinds: different designs. Shading: awnings and sun sails

Ready for your individual quote? Configure your windows now!

To configurator

Windows FAQ

Frequently asked questions about our plastic windows from German premium brands. From choosing the right profiles to technical specifications.

Which window manufacturers do you have in your range?
We carry exclusively German premium brands: Salamander (greenEvolution 76 MD, bluEvolution 82/92), Aluplast (Ideal 5000/8000), Gealan (S 8000/9000) and Rehau (Synego). All manufacturers stand for innovation, quality and energy efficiency.
What is the difference between the Salamander profiles?
• greenEvolution 76 MD: 76 mm construction depth with middle seal, ideal for renovations
• bluEvolution 82: 82 mm construction depth for optimal insulation
• bluEvolution 92: 92 mm construction depth for maximum energy efficiency and passive house suitability
What Aluplast profiles do you offer?
• Ideal 5000: 70 mm construction depth, 5-chamber system – perfect for renovations with limited dimensions
• Ideal 8000: 85 mm construction depth, 6-chamber system with middle seal for premium insulation
What characterises Gealan profiles?
• S 8000: 74 mm construction depth, 6-chamber system with steel reinforcements for high stability
• S 9000: 83 mm construction depth, middle seal, passive house suitable with very good Uw values
What Rehau profiles do you have?
Rehau Synego: 80 mm construction depth, 6–7 chambers, optionally with middle seal (MD). Known for great design variety and proven technology.
What glazing options are available?
• Double glazing: Standard for good thermal insulation
• Triple glazing: Premium for maximum energy efficiency
• ESG/VSG safety glass: for increased security
• Frosted glass: for privacy with simultaneous daylight
What fittings and handles are available?
We offer fittings from leading manufacturers such as Roto, Siegenia and Winkhaus. Handles in plastic, metal or wood designs. All fittings are optimised for the respective window profiles.
Can you also manufacture custom-made products?
Yes, we manufacture custom-made products such as arched windows, triangular windows, trapezoidal windows and other geometric shapes. Contact us for individual solutions and tailor-made windows.

Sliding doors FAQ

Frequently asked questions about our sliding doors from German premium brands.

What sliding door systems do you offer?
We offer lift-slide doors from four premium manufacturers: Salamander: Evolution Drive Smart (smart home capable, barrier-free, 5-chamber, 82mm, Uw 0.74) & Evolution Drive 82 (Optional 50mm threshold, 5-chamber, 82mm, Uw 0.74). Aluplast HST 85: 6-chamber system, 85mm construction depth, Uw 0.80, excellent thermal insulation. Gealan HST: 5-chamber system, 85mm construction depth, Uw 0.84, outstanding thermal insulation. Rehau Synego HST: 5-chamber system, 80mm construction depth, Uw 0.86, high sound insulation. All systems have 1-2 tracks and are energy efficient.
What are the differences between the manufacturers?
Salamander: Focus on smart home and barrier-free, flat 50mm threshold possible. Aluplast: Highest number of chambers (6), best insulation (Uw 0.80), optimised sound insulation. Gealan: Balanced ratio of insulation and price, high-quality seals. Rehau: Proven technology, great design variety, stable construction. All manufacturers offer funding-eligible systems with smooth operation and many colour and design variants.
What glazing options are available for sliding doors?
Sliding doors are available with double or triple glazing. You can also choose ESG/VSG safety glass or frosted glass for privacy – for maximum energy efficiency and security.
Can I install sliding doors afterwards?
Yes, our sliding doors made to measure can also be installed afterwards. We are happy to advise you on suitable solutions!

Front doors FAQ

Frequently asked questions about our plastic front doors and side entrance doors from Salamander, Aluplast, Gealan and Rehau.

What front door systems do you offer?
We offer plastic front doors from four premium manufacturers: Salamander: GreenEvolution 76 MD, BlueEvolution 82 MD, BlueEvolution 92 MD – 5-chamber, Uw from 0.95. Aluplast: Ideal 7000, Ideal 8000 – 5-chamber, energy efficient. Gealan: S 8000, S 9000 – proven quality, funding-eligible. Rehau: Synego – modern design, high insulation. All systems are available with glazing or panel and configurable in many colours.
Can I choose between glazing and panel?
Yes. For our front doors you can choose between glazing (view window with double or triple glass) and panel (solid door infill in over 100 designs). Many doors combine both – e.g. panel below and view window above.
How do I measure my front door correctly?

Measure width and height of the wall opening at several points and note the smallest value. Deduct 15–20 mm for the installation joint. You will find the complete guide in the Measuring section on our info page.

Do you deliver front doors with installation?
We deliver front doors and side entrance doors as delivery only without installation. Installation is carried out by a specialist of your choice. We are happy to advise you on suitable installation companies in your region.

Sun protection FAQ

Frequently asked questions about our sun protection systems: roller shutters and Venetian blinds.

What is the difference between roller shutters and Venetian blinds?
Roller shutters offer complete darkening and additional burglary protection. Venetian blinds (louvers) allow flexible light control with simultaneous daylight. Both systems are available as built-on or external variants.
What control options are available for sun protection?
• Manual: strap or crank
• Electric: switch or radio remote
• Smart home integration: app control, voice control, timer
• Weather automation: Automatic raising in storm or rain
Can I install sun protection afterwards?
Yes, both roller shutters and Venetian blinds can be installed afterwards. We are happy to advise you on the best installation options for your situation.
What slat types are available for Venetian blinds?
• C-80 slats: Standard slats for optimal light control
• Z-90 slats: Premium slats for maximum darkening
Both slat types are weather-resistant and available in various colours.
Are the sun protection systems weather-resistant?
Yes, all systems are designed for outdoor use. Roller shutters tested up to 120 km/h wind resistance, Venetian blinds up to 150 km/h. All materials are UV-resistant and corrosion-protected.
Is there integrated insect protection?
Integrated insect protection is available for roller shutters. For Venetian blinds this can optionally be added. Both variants effectively protect against insects with open windows. Please mention this when enquiring.
What colours are available for sun protection?
All RAL colours as well as wood designs are available. Colours can be chosen to match your facade or window colour. Special colours on request.
How does smart home integration work?
Our sun protection systems are compatible with common smart home protocols (KNX, Zigbee, Z-Wave, WiFi). Control via apps, voice control or timers. Weather automation reacts automatically to sensors.
How long does delivery of sun protection take?
• Standard sun protection: approx. 14 days
• With special colours: approx. 18 days
Delivery time depends on the longest item in your order.
What warranty is there on sun protection systems?
All sun protection systems have 5 years warranty. Details will be provided with your quote. The warranty covers material and processing defects.
Can I install sun protection myself?
Self-installation is generally possible but requires manual skill. We recommend installation by specialists to ensure optimal results and warranty.