Kent · England
Window Mastic in Guston
Window mastic in Guston from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps left after new windows were fitted
- White mastic on grey or black frames
- Gaps between the frame and the inside reveal
Window mastic in Guston, done properly
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We work on aluminium frames, timber windows & doors and composite doors, and common reasons people get in touch are water coming in at the bottom corners of a door and rushed sealant from a window installation.
Outdoor sealant needs dry, clean surfaces, so work on frames around Guston is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
There’s a 12-month guarantee on every job.
- Where
- Guston (CT15)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need window mastic in Guston
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar never bonded as it should, and it lets go sooner than it should.
Most people get in touch after spotting something like this:
- Mastic that has split away from the wall
- Cold air getting in at the frame edge
- Gaps left after new windows were fitted
- Old mastic that has gone black or come away
Schools such as Duke of York's Royal Military School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- Who does the work, and how experienced they are
- Whether VAT is included
- Which sealant they’ll use, and why
- Whether they’re fully insured
Also near Guston
What else we do in Guston
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What the job involves on each surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Guston questions
Does living near the coast affect window mastic in Guston?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can you help a landlord with a rental near Martin Mill station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Can you reach windows above the ground floor?
Yes, in most cases. Access is planned before work begins, so mention the height and anything in the way.
Is the new sealant paintable?
Not usually, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Why act early in Guston
The work is quick compared with the damage it prevents: it takes a few hours for a handful of frames, longer for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Around Guston, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why Guston customers choose us
- Colour agreed with you before we start
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- Anti-fungal silicone where joints get wet
Read our cost guide and our reviews.
Guston homes and the weather
Guston is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. With historic houses such as Walmer Castle (about 4.7 miles north-east) nearby, there’s older building stock in the area around Guston as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Martin Mill station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you live in an older home near Church of St Martin of Tours, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Guston is about 2 miles north-east of Dover, in Kent. Guston gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Kent coverage runs to 922 places, and Guston is one of them. Chelmsford is on our list too, about 54 miles from Guston.
Our applicators cover all of CT15 for window mastic and the streets around it. If you need window mastic at a property on The Street, Chance Meadow and The Lane or anywhere close by, we can help. We also cover the places around Guston: East Langdon (1 mile north-east), Church Whitfield (1 mile north-west), West Cliffe (1 mile east), Martin Mill (2 miles north-east) and Charlton-in-Dover (2 miles south-west). Within a short drive, we also cover Canterbury (14 miles north-west), Folkestone (8 miles south-west), Ramsgate (13 miles north), Broadstairs (15 miles north), Deal (5 miles north-east) and Hythe (12 miles south-west).
Local landmarks in Guston
In Guston, that means homes and buildings near Connaught Park, St Edmund's Catholic School and Swingate Inn. The closest station to Guston is Martin Mill station, about 1.6 miles north-east. Other landmarks nearby include Royal Victoria Hospital (1.9 miles south) and Dover Castle (1.8 miles south). For a walk, there’s Dover Western Heights.
How it works
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. It usually takes a few hours for a few frames, or a day or more for a whole house. In a small place like Guston, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Preparing for the visit
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
Get a quote
We quote each job on its own. Simply call 0345 464 0079 or drop us an email and describe the job, and photos are welcome.
Read more
What we can’t put right
It helps to know what we can’t do too:
- Draughts through the window seals rather than the frame
- Faulty window hardware
- A frame that has rotted at the joint
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer before booking.
What we seal
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- Composite doors
- Window sills
- uPVC windows
Landlord and commercial work in Guston
Landlords and agents in Guston can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.