Buckinghamshire · England
Window Mastic in Gerrards Cross
Problem with your window and door frames in Gerrards Cross? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Gaps where the sill meets the wall
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
Window mastic in Gerrards Cross
Around Gerrards Cross we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on timber windows & doors, composite doors and patio & French doors, and common reasons people get in touch are gaps left after new windows were fitted and white mastic on grey or black frames.
Homes around Gerrards Cross range from older properties to newer houses, and their windows range just as widely. The right sealant depends on the frame and on what it sits in.
Your job is guaranteed for a year, as with all our work.
- Location
- Gerrards Cross (SL9)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Keep timber frames painted
- Clean frames with a soft cloth and soapy water
- Keep jet washers away from the mastic
- Air rooms to keep condensation down around windows
Try not to touch the new joint while it cures, following the cure time we give you. Keep jet washers away from the frames.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Landlords, agents and businesses in Gerrards Cross
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Towns and villages near Gerrards Cross
What else we do in Gerrards Cross
What we can’t put right
We will always be straight with you, so here’s what new sealant will not do:
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
- Draughts through the window seals rather than the frame
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before booking.
What we seal
- Aluminium frames
- Composite doors
- Timber windows & doors
- Window sills
- Patio & French doors
- uPVC windows
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Windows and doors in Gerrards Cross
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as The Gerrards Cross CofE School, larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St James Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Gerrards Cross is about 5 miles north-east of Slough, in Buckinghamshire. Anywhere in SL9, we cover window mastic for homes and businesses. Our area takes in 263 places across Buckinghamshire. Our Reading page covers work nearby (20 miles or so).
Postcode districts we cover here for window mastic: SL9. Whether your property is on Station Road, East Common and Oxford Road or anywhere close by, we can help. You’ll find Gerrards Cross on the A40 and A413, which makes it straightforward to reach. We also cover the places around Gerrards Cross: Tatling End (1 mile south-east), Fulmer (1 mile south), Hedgerley Green (2 miles west), Higher Denham (2 miles east) and Baker's Wood (2 miles east). Larger places within reach include High Wycombe (9 miles west), Chesham (9 miles north), Marlow (9 miles west), Amersham (7 miles north), Beaconsfield (4 miles north-west) and Princes Risborough (15 miles north-west).
Local landmarks in Gerrards Cross
Around Gerrards Cross, our work takes us to homes and buildings near St Mary's School, The Chalfonts Community College and Bulstrode Park and the streets around them. Gerrards Cross has its own railway station: Gerrards Cross station. Other landmarks nearby include Chiltern Open Air Museum (3.8 miles north) and Chalfonts and Gerrards Cross Hospital (1.7 miles north). Not far away are Horse Shoe Bay and Church Wood.
FAQs for Gerrards Cross
I let a flat near Gerrards Cross station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Gerrards Cross for window mastic?
Yes, Gerrards Cross is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Can you reach windows above the ground floor?
Generally, yes. We plan safe access before the job.
Can I paint over the new sealant?
Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you fully insured?
Yes. Mr Mastic is fully insured.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Is there any odour?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
What we’re called out for in Gerrards Cross
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
If you can see any of these, it’s time to have the joints looked at:
- Old mastic that has gone black or come away
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
- Cracked or shrunken mastic around the frame
Rented homes near Gerrards Cross station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- Who turns up on the day
- Is the old sealant removed completely?
- What preparation is included
- How long to leave it before use
Why deal with it now?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. In a smaller place like Gerrards Cross, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
Why book with us
- We never seal over old sealant
- We’re fully insured
- Over 20 years’ experience
- Domestic, commercial and hotel work
What happens on the day
At the end, we look at the finished work together and explain the cure time. The visit itself usually takes a morning for a couple of windows and a door, depending on the amount of work. A visit to Gerrards Cross is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
- Clear the area around the work
Getting a quote
If you’re in Gerrards Cross and need window mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.