Rehau windows review 2026
Rehau is the most installed uPVC window system in the UK, but the company does not sell windows directly to homeowners. Instead, Rehau supplies plastic profiles to hundreds of independent fabricators who cut, weld, and assemble the finished windows. This means the product you receive depends heavily on the quality of the fabricator and installer you choose.
Rehau windows cost £450-£650 for a standard 600×900 mm casement installed in 2026. That is 10-15% more than budget uPVC but less than premium brands like Veka. Compare quotes from FENSA-registered installers.
- Rehau windows cost £450-£650 for a standard 600x900mm casement installed.
- Rehau is 10-15% pricier than budget uPVC but cheaper than premium brands.
- Standard 70mm profile achieves a B energy rating with U-value 1.3 W/m²K.
- 80mm profile reaches A+ rating and U-value 1.1 W/m²K with double glazing.
- Choose a FENSA-registered fabricator for best quality and warranty cover.
- Rehau windows review 2026
- How Rehau window costs compare to other uPVC brands in 2026
- Rehau window energy ratings and U-values you can expect in 2026
- Quick numbers Rehau window specs compared to industry averages
- What a Rehau window guarantee covers in 2026
- How to verify a genuine Rehau window installer in 2026
- The most important number for a Rehau window buyer in 2026
In 2026, a standard Rehau casement window (600 x 900 mm, fully installed) costs between £450 and £650. This is roughly 10–15% more than a budget-brand uPVC window but less than a premium timber or aluminium equivalent.
How Rehau window costs compare to other uPVC brands in 2026
Rehau occupies the middle to upper tier of the uPVC market. The table below shows typical installed costs for a standard 600 x 900 mm casement window in 2026, based on Checkatrade cost data and quotes from FENSA-registered installers (Checkatrade 2026 cost guide).
| Window brand type | Typical installed cost (600 x 900 mm) |
|---|---|
| Budget uPVC (e.g. Duraflex, Liniar) | £350 – £500 |
| Rehau uPVC | £450 – £650 |
| Premium uPVC (e.g. Veka, Kommerling) | £500 – £700 |
The price difference narrows for larger or custom-sized windows. Rehau’s tooling cost per window drops at higher volumes, so a large bay window may cost only 5–8% more than a budget equivalent.
Rehau window energy ratings and U-values you can expect in 2026
U-value measures how quickly heat passes through a window. Lower numbers mean better insulation. All Rehau profiles sold in the UK in 2026 meet or exceed Building Regulations Part L 2021 (GOV.UK Approved Document L).
The standard Rehau 70 mm profile (S-707) with double glazing achieves a centre-pane U-value of 1.3–1.4 W/m²K (Rehau technical data sheet 2026). This qualifies for a B energy rating under the BFRC scheme.
The 80 mm profile (S-807) reaches 1.1–1.2 W/m²K with double glazing, earning an A+ energy rating. Triple-glazed Rehau 80 mm windows achieve U-values as low as 0.8 W/m²K (BFRC registered ratings database).
The 90 mm profile (S-907) is designed for passive house standards and can reach 0.7 W/m²K with triple glazing, though it is rarely specified for standard UK homes.
Quick numbers Rehau window specs compared to industry averages
The table below compares Rehau’s main profile ranges against the industry average for non-Rehau uPVC windows. All figures come from the Rehau UK technical brochure 2026, the BFRC database, and PAS 24 certification records (Rehau UK technical brochure 2026, BFRC database, PAS 24 certification records).
| Specification | Rehau S-707 | Rehau S-807 | Rehau S-907 | Industry average uPVC |
|---|---|---|---|---|
| Profile depth | 70 mm | 80 mm | 90 mm | 70 mm |
| U-value (double glazed) | 1.3–1.4 W/m²K | 1.1–1.2 W/m²K | 0.9–1.0 W/m²K | 1.4–1.6 W/m²K |
| Acoustic rating (RW) | 32–35 dB | 35–38 dB | 38–42 dB | 30–33 dB |
| Security rating | PAS 24 | PAS 24 | PAS 24 | PAS 24 (optional) |
| Warranty (profile only) | 10 years | 10 years | 10 years | 5–10 years |
What a Rehau window guarantee covers in 2026
Rehau provides a 10-year guarantee on its profiles against discolouration, warping, or structural failure (Rehau UK guarantee terms 2026). This covers the plastic extrusion only. It does not cover the glass, hardware, or installation.
The fabricator or installer typically offers a separate guarantee on labour. This varies from 5 to 10 years and must be confirmed in writing before you sign a contract. The double glazing itself carries a standard 10-year guarantee across all UK window installers, in line with Glass and Glazing Federation guidelines (GGF guidelines).
You should ask for three separate guarantee documents: one for the Rehau profile, one for the glass, and one for the installation labour. If the installer cannot provide all three, consider using a different company.
How to verify a genuine Rehau window installer in 2026
Rehau does not certify installers directly. To verify a genuine Rehau product and a competent installer, follow these steps.
First, check that the fabricator is registered with MCS if you plan to claim energy grants such as the Great British Insulation Scheme (MCS website). MCS certification is required for any energy-efficiency claims linked to government funding.
Second, confirm the installer is registered with FENSA or CERTASS for Building Regulations compliance (FENSA website). This is a legal requirement for replacement window installations in England and Wales.
Third, look for the Rehau holographic label on the glazing bead and a laser-etched profile code on the frame. Genuine Rehau windows carry both. You can also use Rehau’s online installer finder to locate approved fabricators in your area (Rehau installer finder).
how to check FENSA registration and avoid rogue traders
The most important number for a Rehau window buyer in 2026
The average Rehau window costs £500–£650 installed, versus £400–£500 for a budget brand. This is a 20–30% premium that buys a 10-year profile guarantee, an A+ energy rating, and PAS 24 security certification.
For a typical 10-window house, the total premium over budget uPVC is £1,000–£1,500. The Energy Saving Trust’s window energy savings calculator suggests payback via reduced heating bills takes approximately 8–12 years at 2026 energy prices (Energy Saving Trust window energy savings calculator).
If you plan to sell your home within five years, the premium is unlikely to be recovered pound-for-pound in the sale price. Rehau windows add value and appeal, but estate agents typically do not attribute a specific uplift for the brand.
cost of replacing windows before selling a house
For most homeowners, the decision comes down to how long you plan to stay. If you expect to live in the house for more than 10 years, the energy savings cover the extra cost and you benefit from better insulation and security throughout that period. If you plan to move sooner, a mid-range uPVC brand may offer better value.
Frequently Asked Questions
A standard 600 x 900 mm Rehau casement window costs £450 to £650 fully installed in 2026, according to Checkatrade cost data and FENSA-registered installer quotes.
Yes, Rehau is the most installed uPVC window system in the UK and meets or exceeds Building Regulations Part L 2021. Performance depends on the fabricator and installer you choose.
The standard 70 mm Rehau profile with double glazing achieves a centre-pane U-value of 1.3 to 1.4 W/m²K, earning a B energy rating. The 80 mm profile reaches 1.1 to 1.2 W/m²K for an A+ rating, per Rehau technical data.
Both are premium uPVC brands. Rehau windows cost £450-£650 installed, while Veka typically costs £500-£700. Rehau offers slightly lower U-values on its 80 mm profile, making it a strong choice for energy efficiency.
Yes, Rehau profiles are backed by a 10-year guarantee against manufacturing defects, but the installer or fabricator provides the overall warranty. Always confirm cover with your FENSA-registered installer.
