Buckinghamshire · England
Longwick Window Mastic
Professional window mastic in and around Longwick, with every bit of old sealant taken out first.
- Rushed sealant from a window installation
- Whistling draughts around closed windows
- Draughty joints inside around the window
How we handle window mastic in Longwick
Around Longwick we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you are dealing with rushed sealant from a window installation and rain getting in at the frame or under the sill, we can help, on composite doors, aluminium frames and window sills alike.
Many houses in smaller places like Longwick have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
There’s a 12-month guarantee on every job, large or small.
- Place
- Longwick (HP27)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Patio & French doors
Door frames take knocks and movement every time the doors are used. The sealant must cope with it.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.
How we quote for window mastic
You’ll get a clear quote before we start. It’s based on:
- How many areas need sealing
- Which sealant suits the joint
- How much there is to do
- Working hours on commercial sites
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Helping us quote
Before you ask for a quote, have a think about:
- Where the property is
- Photos by email, if that’s easy
- How we’d reach the joints
- The type of property
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand.
Frames and glazing around Longwick
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to Owlswick Chapel include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Longwick Church of England Combined School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Longwick is about 5 miles east of Thame, in Buckinghamshire. Homes, rented property, offices and hotels in Longwick is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Longwick is one of 263 places in Buckinghamshire where we work for window mastic. You can also see our page for Oxford, roughly 16 miles from Longwick.
Postcode districts we cover here for window mastic: HP27. Local streets include Headland End, Wickfields and Furrow Drive, all of which we cover. Other places close to Longwick include Owlswick (1 mile north), Alscot (1 mile east), Pitch Green (1 mile south-west), Ilmer (1 mile north-west) and Horsenden (1 mile south). We also work in nearby towns such as Aylesbury (6 miles north), High Wycombe (9 miles south-east), Chesham (11 miles east), Marlow (12 miles south), Amersham (12 miles east) and Beaconsfield (13 miles south-east).
Local landmarks in Longwick
Around Longwick, our work takes us to homes and buildings near Princes Risborough School and The Red Lion Public House and the streets around them. The nearest railway station is Monks Risborough station, roughly 1.3 miles east of the centre. Nearby you will also find Great Kimble Dial Hill (2.4 miles east) and St John's Hospital (4.6 miles north). Open spaces near Longwick include Brush Hill Local Nature Reserve and Beacon Hill.
What we are called out for in Longwick
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
The problems people generally mention when they call include:
- Rain getting in at the frame or under the sill
- White mastic on grey or black frames
- Gaps between the frame and the inside reveal
- Gaps where the sill meets the wall
Rented homes near Monks Risborough station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Before you book anyone
- Which sealant they’ll use, and why
- Who does the work, and how experienced they are
- What happens if the job turns out different
- The length of the guarantee
Honest limits
A few problems are outside what sealant work can do:
- Broken hinges, locks or handles
- Damp problems in the wall away from the window
- A failed sealed unit that has misted up
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber windows & doors
- Composite doors
- Patio & French doors
- uPVC windows
- Aluminium frames
- Window sills
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In an older home around Longwick, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- An ARBOMaster approved applicator
- A choice of colours where the product allows
- We agree the colour with you first
- 180+ five-star Google reviews
Take a look at what affects the cost and customer reviews.
Longwick questions
Do you cover smaller places like Longwick?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Monks Risborough station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Where are you based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Can you do the inside joint as well?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
How the visit works
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. The job usually takes anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. Parking around Longwick is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, we confirm safe access to each frame.
- 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.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
Ask for a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.