Buckinghamshire · England
Terriers Window Mastic
We cover Terriers for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Cold air getting in at the frame edge
- Leaking joints at the ends of sills
- Black, perished sealant on frames
About our window mastic in Terriers
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. Common call-outs are for water coming in at the bottom corners of a door and mastic that’s falling out in pieces, on window sills, uPVC windows and aluminium frames.
Many houses in smaller places like Terriers have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
You get a one-year guarantee, the same in Terriers as everywhere else we work.
- Location
- Terriers (HP13, HP15)
- Region
- Buckinghamshire
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Terriers
I let a flat near High Wycombe station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Will you come out to Terriers?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Can you do the inside joint as well?
Yes. Inside, the joint between frame and plaster is sealed neatly.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Terriers, along with the rest of our area.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can new window sealant be painted?
Not usually, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Nearby places to Terriers
Also in Terriers
What affects the quote in Terriers
You’ll get a clear quote before any work starts. It’s based on:
- How easy the joints are to reach
- Mould in or behind the old joints
- Which sealant suits the joint
- The size of the job
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Helping us quote
Before you ask for a quote, have a think about:
- The type of property
- Pictures of the joints, sent by email
- Where the property is
- Roughly how big the job is
Want a quote for window mastic? Please ring 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
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.
Frames and glazing around Terriers
London and the South East are among 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 Hughenden Manor (about 1.1 miles north-west) are a reminder that the area around Terriers 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.
Managing a site like The Royal Grammar School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to High Wycombe station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Terriers is about 1 mile north-east of High Wycombe, in Buckinghamshire. For window mastic in and around Terriers, please ring 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Buckinghamshire, Terriers included. Our Buckinghamshire coverage runs to 263 places, and Terriers is one of them. Reading is on our list too, about 17 miles from Terriers.
We work across the HP13 and HP15 postcode area for window mastic. That includes homes and businesses on Terry Road, Perth Road and Green Road. Nearby, we also carry out window mastic in Totteridge (1 mile south-east), Four Ashes (1 mile north), High Wycombe (1 mile south-west), Micklefield (1 mile south-east) and Hazlemere (1 mile north-east). We also work in nearby towns such as Aylesbury (13 miles north), Chesham (7 miles north-east), Marlow (5 miles south), Amersham (6 miles north-east), Beaconsfield (4 miles south-east) and Chalfont St Peter (8 miles east).
What’s near Terriers
Typical jobs here are in homes near The Tower, The Dolphin Eye pub and Highworth Combined School and Nursery. The nearest railway station is High Wycombe station, roughly 1 mile south-west of the centre. A little further out are Hospital of St John the Baptist (1.1 miles south) and High Wycombe Castle (1 mile south-west). Green spaces nearby include Gomm's Wood.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
What we do, step by step
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work starts. The work generally takes most of a day for a typical house, less for a few frames. For a job in Terriers, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- 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
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
- Keep children and pets away from the work area
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
When to call us in Terriers
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
Keep an eye out for these signs:
- Gaps where the sill meets the wall
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
- Untidy mastic left by window fitters
Homes close to Church of Saint Francis include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- Whether the sealant suits the joint
- Who turns up on the day
- What guarantee comes with the work
- Is VAT in the price?
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- A door that needs adjusting, rehanging or new seals
- Soft or decayed wood in the frame
- Condensation trapped between the panes
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Composite doors
- Patio & French doors
- Aluminium frames
- Window sills
- uPVC windows
- Timber windows & doors
Surface by surface
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We will point out any rot we find, as that’s a job for a joiner.