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★★★★★ 4.9 from 278 Google reviewsFENSA registeredSwansea based

Window repairs & maintenance

Made to measure, fitted by our own team, with a free home survey and a clear written quote.

★★★★★4.9 from 278 Google reviews
Window and door repair

uPVC window repair — what’s usually involved

UPVC is robust, but hardware and seals wear over time. A typical uPVC window repair might include:

  • Removing the sash to replace friction hinges and recalibrate opening tension.
  • Resetting striker keeps so multi-point locks engage smoothly without excessive handle force.
  • Swapping flattened gaskets and re-sealing the perimeter to cut draughts.
  • Re-glazing and toe-and-heeling larger sashes so they don’t drop.
  • Cleaning and re-lubricating moving parts for a light, consistent action.

Misted double glazing repair — clear views, better insulation

A foggy pane means the sealed unit has failed. We:

  • Measure the glass accurately (including spacer thickness and coatings).
  • Order a matching A-rated replacement unit (privacy/acoustic/solar options available).
  • Remove beading, extract the old unit and install the new with warm-edge spacers where specified.
  • Re-bead, seal and test for airtightness.

Results: clearer views, better thermal performance and far less condensation around the edges.

Hinge and handle issues — small parts, big difference

Worn friction stays cause dropped corners, rattles in the wind and sashes that scrape. Tired handles and out-of-line keeps force you to “lean” on the hardware to lock. We match hinge type and stack height, replace as pairs for symmetry, re-align keeps and set the handle gearbox so everything closes with a firm, light action. It feels new because, in the right places, it is.

Sash window repair — keeping heritage smooth and snug

For sliding sashes we offer:

  • New balances or cords and pulleys, correctly rated to the sash weight.
  • Meeting-rail alignment and latch setting for a positive close.
  • Brush and compression seals that cut whistling draughts without spoiling sightlines.
  • Optional acoustic laminates or safety glass in critical panes.

Where frames are sound, sash window repair preserves character and lifts comfort swiftly.

Repair vs replace — honest guidance on best value

We apply a simple rule: will this repair deliver a stable, multi-year fix?

  • Repair is best for isolated failures: a single misted unit, a couple of worn hinges, a handle or lock problem, or gaskets past their best.
  • Replacement is wiser when multiple panes have failed, frames are warped, sashes are heavily dropped or ventilation/compliance needs can’t be achieved with the existing frame.

If replacement makes more long-term sense, we’ll price both routes so you can decide with confidence.

Our repair process — quick, tidy, traceable

  • Diagnosis and options We inspect the window, identify root causes (not just symptoms) and give you clear choices with itemised pricing.
  • Parts matched correctly We source the exact hinge stack height, handle spindle length, gearbox type, gasket profile and sealed-unit spec to avoid “close enough” bodges.
  • Tidy on-site work Dust sheets down, sashes removed safely, components swapped, frames realigned and seals dressed with clean, consistent beads.
  • Testing and sign-off We check lock engagement, compression, reveal clearances and smooth operation — then talk you through care tips.
  • Aftercare If anything beds-in and needs a tweak, we’ll return promptly.

Preventative maintenance — small habits, long life

A few minutes each season pays off:

  • Clean and check seals around the frame; replace any perished gaskets.
  • Lubricate hinges, keeps and handles lightly (avoid over-oiling).
  • Clear drainage channels at the bottom of frames to prevent water pooling.
  • Operate every opener a few times to keep hardware moving freely.
  • Inspect trickle vents and closers to ensure smooth airflow control.

Ask about an annual maintenance visit if you prefer a professional eye on things.

Noise, safety and privacy upgrades during repair

Repairs are the perfect moment to add practical enhancements:

  • Acoustic laminated units in front bedrooms or home offices to soften road noise.
  • Laminated security glass beside doors or at low level.
  • Privacy patterns for bathrooms and overlooked elevations.
  • Child-safety restrictors on upper floors for peace of mind.

We’ll explain costs and likely benefits so you can choose upgrades that you’ll genuinely notice.

Signs to call a repair specialist sooner rather than later

  • A corner of the sash catches the frame or the handle needs force to lock.
  • Draughts appear around the perimeter or you hear whistling in wind.
  • Moisture or fog forms between panes (not just on the room side).
  • Black-spot mould appears near the glass edge.
  • The window won’t stay open or slams shut unexpectedly.

Acting early prevents minor issues becoming costly damage.

What customers say

Rated 4.9 out of 5 on Google and Trustpilot

4.9
★★★★★278 Google reviews
FENSA approved window and door installations
Posted on Google Google
Steve Young profile picture
Steve Young
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No fuss quote, work carried out on time, great job, polite friendly team & left everything clean & tidy. Have recommended to my friends.
Posted on Google Google
Nigel Jenkins profile picture
Nigel Jenkins
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We had our windows and doors replaced by Sureseal Windows and could not be happier. We had a home visit from the salesman, who went through the various designs and colours available plus an initial measurement of all the items needed. Following our agreement to purchase the doors and windows a supervisor visited to precisely measure the openings and look for any issues that might arise during the install. The fitting was booked in about 10 weeks later. Alan contacted us to give his ETA of the morning of the start of the job. And we cannot praise Alan enough for his work and cleaning up after. All areas where work was done were covered with dust sheets and no mess was left. There were a couple of remedial jobs to be completed when the parts were available. Sean completed these jobs for us over a coarse of a morning. And, as with Alan previously Sean's work was great and all was cleaned up on completion. Both workers are a credit to SureSeal. And we highly recommend the Company.
Posted on Google Google
shirley powell profile picture
shirley powell
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Absolutely amazing service, with price and installation, very clean when he finished,
Posted on Google Google
MIck Hedges profile picture
MIck Hedges
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From initial call from Sureseal making appointments to choosing our windows all the team have been very knowledgeable and helpful, No big sell to get the costs up just what we wanted and even reduced aspects no of closers etc. to meet requirements. Plenty of payment options with full explanation again no push either way. Survey was again very straightforward and with some discussion even more savings found. Pleasure to do business with. Great service and very knowledgeable.will post photos of finished project once complete. Mike Hedges
Posted on Google Google
Adam Wisniewski profile picture
Adam Wisniewski
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Excellent company. Got all windows and doors installed professionally, as agreed and on time. Very good quality product professionally installed. Will always recommend
Posted on Google Google
Dolores Furlong-Martin profile picture
Dolores Furlong-Martin
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We had all new windows and doors from sureseal. A very skilled fitter installed them. We had a couple of issues after but were resolved immediately. Would certainly recommend this company from start to finish a great job and a very happy customer
Posted on Google Google
Sarah Thomas profile picture
Sarah Thomas
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Extremely efficient, professional and helpful company. Exemplary fitter. Would highly recommend and have already done so!
Posted on Google Google
Sam Rowe profile picture
Sam Rowe
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Would definitely recommend Sureseal, especially the service engineers who have been very helpful and professional!
Posted on Google Google
Michael Curling profile picture
Michael Curling
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Sureseal windows has completed installation of my windows to a very high standard with excellent work by the lone installer who was very organised and polite and completed within the time frame quoted I highly recommend this firm
Posted on Google Google
Livia Toth profile picture
Livia Toth
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Sureseal windows all team very good. Customer service always available, helpful and professional. Alan very kind, polite and professional. He knows what he is doing and working hard. I am above and beyond. Thank you so much.
Rated Excellent on Trustpilot: TrustScore 4.9 from 495 reviews

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 uPVC window repair take?

Most hinge/handle jobs take under an hour per window; misted double glazing repair is usually a single visit to measure and a second to fit once the unit arrives.

Will repairing a misted unit fix condensation on the room side?

Replacing failed units stops moisture between panes. Room-side condensation relates to ventilation and room humidity — we’ll advise on vents and daily habits to help.

Can you repair old windows during winter?

Yes. We work cleanly and quickly, keeping rooms protected and warm. We’ll schedule glazed unit swaps to minimise time openings are uncovered.

Do repairs come with a guarantee?

Yes. New parts and sealed units come with manufacturer warranties, and our workmanship is guaranteed. We’ll outline terms clearly.

Are you able to repair windows from any installer?

In most cases, yes. We carry universal and brand-specific parts; if a system is obsolete, we’ll propose compatible solutions or replacement if that’s the only reliable route.

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
★★★★★4.9 from 278 Google reviews
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