Window installations
A great window only performs as well as the way it’s fitted. The difference between “okay” and “outstanding” is in the survey, the packers, the fixings and the seal line you barely notice — details our window installers obsess over.
★★★★★4.9 from 278 Google reviews
We plan every window installation so your new units open smoothly, seal tightly and look like they were meant to be there. From first advice to final clean-down, you get tidy workmanship from FENSA window installers who respect your home and your time.
Good installation isn’t guesswork. It’s method: precise measurements, square frames, continuous seals and a finish that protects against British weather for years. That’s how we make the numbers on the spec sheet show up as real comfort in your rooms.
Local window installers who plan the finish before the first screw
The neat, intentional look you want is designed up front. Our team checks reveal lines, plaster returns and external cills so trims are minimal and tidy. We aim for equal sightlines across bays and pairs, specify trickle vent styles that don’t distract from the façade, and colour-match sealants and trims so nothing jars the eye.
Why the survey is the most important step
A precise survey prevents almost every common problem. We record:
- Structural openings and any out-of-square or bowed brickwork
- Lintel condition and cill levels to avoid frame stress later
- Opener clearances relative to tiles, blinds, balconies and internal reveals
- Ventilation requirements so rooms meet current standards
- Heritage constraints or conservation preferences where relevant
If something would compromise performance or appearance, we flag it and propose a fix before manufacture.
Installation standards that protect performance
Our standards focus on:
- Packers placed at hinge and lock points to support loads and keep sashes square
- Correct fixings at specified centres and depths, matched to the substrate
- Airtight internal seals to stop micro-draughts and moisture ingress into the reveal
- Weatherproof external seals and cill end caps set to shed water cleanly
- Toe-and-heel glazing on doors and large sashes so they don’t drop over time
These details mean handles turn freely, sashes don’t catch and your heating doesn’t leak through hidden gaps.
FENSA window installers — compliance and paperwork made simple
Most like-for-like replacements don’t need planning permission, but they must comply with Building Regulations (including thermal performance and ventilation). As FENSA window installers we:
- Self-certify compliant installations and register them for your certificate
- Advise on trickle vents, safety glazing and egress where rules apply
- Provide documentation you’ll need for future property sales
You get the right result without a paperwork headache.
uPVC window fitters with an eye for detail
UPVC is low-maintenance and forgiving — until it’s not. Skipped packers, overtight screws or rough seal lines are the usual culprits when things go wrong. Our uPVC window fitters take the time to:
- Protect gaskets and sightlines during fitting and glazing
- Set hardware to manufacturer torque and alignment guidance
- Dress sealants with smooth, consistent beads that stay neat for years
- Align trims flush to reveals so the finish looks designed, not improvised
You’ll see the difference on day one, and still appreciate it in five years.
Window installation for every style
We install the full range without compromise on method:
- Casement windows — sculptured or chamfered profiles, balanced sightlines and smooth friction hinges
- Flush sash — timber-look frames with crisp, level lines and discreet vents
- Sliding sash — careful sash alignment, smooth balances and tidy parting beads
- Tilt and turn — calibrated gearing, tilt-before-turn safety and tidy inward clearances
- Bay and bow — attention to structural ties, roof canopies, cills and water management
Whatever you choose, the installation plan is tailored to the style and the room it serves.
Energy performance protected at the perimeter
Your U-values assume an airtight perimeter. We use:
- Low-expansion foams and backing where appropriate
- Continuous internal sealing to stop air movement into the reveal
- Warm-edge technology and correct packer placement to reduce cold-bridge risks
- External weather seals that flex with seasonal movement
That’s how energy efficient windows stay energy efficient once they’re in the wall.
Security set up the right way
We don’t just fit locks — we set up security to work in real life:
- Multi-point locking aligned to robust keeps, not thin or crumbling masonry
- Hinge guards, reinforced screw ports and correct fixing lengths for pull resistance
- Laminated glass upgrades in vulnerable positions, especially beside doors
- Child-safety restrictors on upstairs windows where ventilation needs peace of mind
Security that’s effective, discreet and easy to live with.
Inside your installation day — what to expect
- Arrival and protection: dust sheets down, access agreed, furniture protected
- Removal: glass and frames taken out carefully, reveals checked and prepped
- Fit and fix: frames set level, fixed, packed and sealed; sashes hung and adjusted
- Finishing: trims, cills and mastic lines completed; hardware tested; site tidied
- Handover: operation demo, maintenance pointers and documentation issued
Most homes see meaningful progress room by room, keeping disruption low.
What customers say
Rated 4.9 out of 5 on Google and Trustpilot
Your free quote
Your free quote.
Tell us a little about your home and we will call to talk it through and arrange your free survey.
- Quick and free. Just your name, number and postcode.
- A friendly chat, not a sales pitch. We’ll call to talk through your project and answer your questions, then arrange your free home survey.
- Prefer to ring us? Call free on 0800 233 5576, Monday to Friday 9am to 5pm.
Get your free, no-obligation quote
Leave your name, number and postcode and one of our local team will call you to arrange your free home survey.
★★★★★“Extremely efficient, professional and helpful company.”Sarah Thomas, Google review · 4.9 from 278 reviews
Questions
Your questions, answered
How long does a typical install take?
A three-bed home is often completed in one to three days, depending on access and bays. We confirm timelines after the survey.
Will the work be messy?
We minimise disruption with dust protection, careful removal and end-of-day tidy-ups. Old frames and glass are taken away as part of the service.
Do I need trickle vents?
We’ll advise based on current ventilation rules and how you use each room. Where required, we specify discreet, colour-matched vents that don’t spoil the look.
Can you coordinate with my decorator or builder?
Yes. If you’re renovating, we’ll liaise on sequencing so reveals and finishes line up perfectly.
What guarantees do I receive?
You get manufacturer warranties on frames and glass, our installation guarantee and your FENSA certificate for compliance and resale confidence.
Ready to talk about your home?
Leave your details and one of our local team will call you, or ring us free on 0800 233 5576.
★★★★★4.9 from 278 Google reviews