Surrey · England
Window & door mastic in Farnham, Surrey
Mastic around window and door frames, sills and patio doors for Farnham, backed by a 12-month guarantee. Call for a quick quote.
- Draughty joints inside around the window
- Hard, cracked sealant around windows
- Cold air getting in at the frame edge
About our window mastic in Farnham
The new joint doesn’t have to be white. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on window sills, composite doors and uPVC windows, and people most often call us about gaps where the sill meets the wall and white mastic on grey or black frames.
Plenty of homes in a town like Farnham have had conservatories, patio doors or new windows added over the years. Each one adds more joints to look after, and those joints age at different rates. Sills, frame heads and glazing joints are where leaks generally start.
A 12-month guarantee comes as standard.
- Place
- Farnham (GU9, GU10)
- Region
- Surrey
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Composite doors
Draughts round the door leaf generally come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.
Why deal with it now?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Gaps in sealant and mould in the bead never get better on their own, and in a busy home in Farnham they get worse with every use. Now is the easy time to put it right.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Colour agreed with you before we start
- A 12-month guarantee on all work
- Fully insured
- Over 20 years’ experience
Take a look at our cost guide or our reviews.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep paint and stain on wooden frames in good order
- Air rooms to keep condensation down around windows
- Keep drainage slots and sill grooves clear
- Clean frames with a soft cloth and soapy water
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Common questions in Farnham
Can you do window mastic in Farnham?
Yes, Farnham is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Is window mastic in Farnham guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you work for letting agents?
Yes. We work for householders, landlords, letting agents, businesses and hotels in Farnham.
Is the new sealant paintable?
That depends on the product. Some hybrid sealants can be painted; silicone cannot. Tell us if you’re decorating and we will choose accordingly.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
How long will my window job take?
The work takes a morning for a couple of windows and a door. Access and the amount of old mastic make the biggest difference.
Can you match the sealant to my frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a job in Farnham, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
- Try not to wet indoor joints just before the visit
Get a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before work begins.
Advice
Windows and doors in Farnham
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Farnham Castle (about 0.6 miles north-west) are a reminder that the area around Farnham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For an older house near a landmark such as St Joan of Arc's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Farnham station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you look after a building such as Farnham College, its window and door frames need their mastic kept sound, just like a home’s.
Farnham is about 6 miles south of Farnborough, in Surrey. Whether you’re in the middle of Farnham or further out, we cover window mastic for every kind of property. Across Surrey, we cover 395 places, Farnham among them. You can also see our page for Reading, about 18 miles away.
Postcode districts we cover here for window mastic: GU9 and GU10. We cover properties on Barncroft, Approach Road and Saxon Croft and the roads around them. Farnham sits on or near the A31 and A287. We also cover Compton (1 mile east), Hale (1 mile north), Upper Hale (2 miles north), Runfold (2 miles east) and Heath End (2 miles north). Within a short drive, we also cover Guildford (10 miles east), Woking (12 miles north-east), Camberley (9 miles north), Frimley (8 miles north), Haslemere (9 miles south) and Cranleigh (14 miles east). Being one of Surrey’s larger places, Farnham has every kind of property, from flats to offices.
Around Farnham
Locally, jobs take us to homes and businesses close to Moor Park, William Cobbett Public House and Weydon School, among other places. Farnham has its own railway station: Farnham station. A little further out are Museum of Farnham (within half a mile north-west) and Farnham Castle (0.6 miles north-west). Not far away are Farnham Park and Aunt's Pool.
What affects the cost of window mastic
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- Any mould that needs treating
- How many areas need sealing
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Helping us quote
Before you ask for a quote, have a think about:
- The rough size of the job
- Where the job is, and your postcode
- The problem you’ve noticed
- Whether it’s a home or a business
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Places near Farnham
Also in Farnham
What sealant work can’t fix
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Draughts through the window seals rather than the frame
- A frame that has rotted at the joint
- Damp problems in the wall away from the window
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- uPVC windows
- Patio & French doors
- Composite doors
- Window sills
- Timber windows & doors
- Aluminium frames