What to look for when choosing a window fitter?
How to Find a Good Window Installer in Sussex

Choosing the right window installer can make all the difference to your home’s energy efficiency and long-term value as well as your peace of mind. The quality of the installation is just as important as the quality of the windows themselves. A poorly fitted window can lead to draughts, condensation, leaks, and long-term structural issues — which is why it’s worth knowing exactly what to look for before hiring a window company.
This article will give you a clear guide finding a reliable, professional window installer you can trust.
1. Check for Proper Accreditation
In the UK, competent installers should be registered with an approved body such as FENSA or CERTASS. This ensures the installation meets building regulations and includes a certificate for your records, important if you ever sell your home.
Any reputable installer in Sussex will be happy to show you their FENSA or CERTASS registration, insurance-backed guarantee and proof of public liability insurance. If an installer cannot provide these, consider it a red flag.
2. Look for Strong Local Reputation & Reviews
When searching for a window installer in Crowborough, Tunbridge Wells, Heathfield, Wadhurst, Crawley, or surrounding areas, your first stop should be online reviews.
The best places to check reviews are Checkatrade, Google and Facebook. Make sure to look at the quality of the feedback and what customers have to say about the company as well as the star rating. Good things to look for are mentions of clean workmanship, professionalism, clear communication, punctuality and aftercare. Installers with years of consistent positive reviews in your area are usually a safe bet.
3. Ask to See Real Examples of Their Work
Good window installers will happily provide photos and case studies of their work. Does the company have experience working on only new builds, older properties or both?
If you have an older property in Sussex, it is important the window installers you choose are capable and experienced to work on such buildings as they often require:
Careful measuring, bespoke trims, specialist attention to draught-proofing and sensitivity to original features.
A portfolio shows how well the company handles different window styles, materials, and property types.
4. Compare Quotes — But Don’t Just Choose the Cheapest
It’s always smart to get 2–3 detailed quotes, but beware of prices that seem too good to be true. Low prices can often mean:
Cheap, low-performance windows, rushed installation, limited or no guarantee and hidden extras added later.
A good quote should clearly list:
- Window specifications (e.g. uPVC, aluminium, timber)
- Glass type & energy rating
- Labour cost
- Disposal of old windows
- Timeframes
- Warranty details
Transparency is a sign of professionalism.
5. Ask the Right Questions Before Hiring
Before committing to an installer, have you asked these questions…
1. Are you FENSA or CERTASS registered?
2. How long have you been installing windows in Sussex?
3. What brands or window systems do you use?
4. Do you use subcontractors or your own installation team?
5. How long is the product and installation guarantee?
6. Can you provide recent references from my local area?
A trustworthy installer will answer confidently and clearly with good evidence of their installations.
6. Check Communication & Professionalism
You can tell a lot about a company by your first interaction with them. A good installer will respond promptly, provide clear, honest advice, avoid pressure-selling tactics, respect your home and time and be approachable and patient with questions. Good communication before installation usually means good service during and after the job as well.
Conclusion
Finding a trustworthy, skilled window installer in Sussex doesn’t have to be difficult — it simply requires knowing what to look for. Check accreditations, read local reviews, compare detailed quotes, and choose a company with a proven track record in your local area.
A well-installed window won’t just make your home warmer and more efficient, it will last for decades.










