Buckinghamshire · England
Window Mastic in Long Crendon
Professional window mastic in and around Long Crendon, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
Long Crendon homes and the weather
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Long Crendon School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Long Crendon is about 2 miles north-west of Thame, in Buckinghamshire. From the centre of Long Crendon to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Long Crendon is one of 263 towns and villages in Buckinghamshire where we work. Our Oxford page covers work nearby.
Postcode districts we cover here for window mastic: HP18. We cover properties on High Street, The Square and Giffard Way. We also cover Chearsley (2 miles north-east), Thame (2 miles south-east), Moreton (3 miles south), Haddenham (3 miles east) and Cuddington (3 miles north-east). We also work in nearby towns such as Aylesbury (8 miles east), High Wycombe (15 miles south-east), Buckingham (15 miles north), Elmhurst (9 miles north-east), Southcourt (8 miles east) and Princes Risborough (8 miles south-east).
What’s near Long Crendon
Typical jobs here are in homes near Lord Williams's School and The Eight Bells Public House. Long Crendon’s nearest station is Haddenham & Thame Parkway station, roughly 2.3 miles east of the centre. Other landmarks nearby include Dinton Castle (4.7 miles east) and Thame Community Hospital (2.4 miles south-east). Green spaces nearby include Snakemoor.
How we handle window mastic in Long Crendon
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you have leaking joints at the ends of sills and old mastic that has gone black or come away, we can put it right, whatever the surface.
Houses in smaller places like Long Crendon can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That is hard on the mastic around frames and sills.
Big or small, you get the same 12-month guarantee.
- Location
- Long Crendon (HP18)
- Wider area
- Buckinghamshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Can I do it myself?
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.
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.
Do you need window mastic in Long Crendon?
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
Signs it’s time to call us include:
- Leaking joints at the ends of sills
- Gaps between the frame and the inside reveal
- Old mastic that has gone black or come away
- Rain getting in at the frame or under the sill
Letting a property close to Haddenham & Thame Parkway station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Before booking anyone
- When the joint can take water or movement
- Is VAT in the price?
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
What we cannot put right
It helps to know what we can’t do:
- Faulty window hardware
- Soft or decayed wood in the frame
- Damp problems in the wall away from the window
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before booking.
Joints and surfaces we work on
- Timber windows & doors
- uPVC windows
- Window sills
- Aluminium frames
- Patio & French doors
- Composite doors
Long Crendon questions
Do you work for landlords with property near Haddenham & Thame Parkway station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Is Long Crendon in your area for window mastic?
Yes, Long Crendon is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Do you work on first-floor windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote and we’ll plan for it.
Do you have sealant for grey or black windows?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Are you insured?
Yes, we’re fully insured for every job we do.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Why it’s worth doing now in Long Crendon
Resealing frames is a short job: it takes a morning for a couple of windows and a door. Wait for damp to appear and there may be plaster and decorating to sort out too. Homes in smaller places like Long Crendon can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
Why choose Mr Mastic in Long Crendon
- Old sealant always removed completely
- White, clear, grey or another colour, product permitting
- 180+ five-star Google reviews
- We’re fully insured
Read how sealant jobs are priced and customer reviews.
More services for Long Crendon
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
How it works
On the day, we start by going over the job with you. Surfaces next to the work are protected before we start. Most jobs take a morning for a couple of windows and a door. For a job in Long Crendon, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or email us.