Buckinghamshire · England
Prestwood External Mastic
External mastic in Prestwood from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
How the job changes by surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
External mastic for homes and businesses in Prestwood
For buildings in Prestwood, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We work on façade panels, copings & trims and joints between brick and frames, and the jobs we see most are panel joints letting water in and hard, crazed mastic that has stopped moving.
Outbuildings, garages and conservatories around homes in places like Prestwood add more joints to look after. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Prestwood (HP16)
- Wider area
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Prestwood
Is Prestwood within the area you cover?
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.
Do you work for landlords with property near Great Missenden station?
Yes. We work for landlords and agents as well as householders. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Is it OK to seal over old sealant?
No. The old sealant always comes out first.
Can you seal joints between two different materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or send us an email with a short description of the job.
What do you need from me for a quote?
Let us know what needs doing and where, with photos by email if possible. If we need more, we’ll ask.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render.
What we are called out for in Prestwood
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
These are the problems we’re asked about most:
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
- Gaps where render, brick and frames meet
For site and facilities teams at buildings such as Prestwood Junior School, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- What happens if they find a problem under the old sealant
- What guarantee comes with the work
- Is the old sealant removed completely?
- What insurance they hold
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Check the sealant is paintable before painting near it
- Never let anyone fill a movement joint with mortar
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Why act early in Prestwood
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. In a smaller place like Prestwood, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
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 choose Mr Mastic in Prestwood
- Every job guaranteed for a year
- Fully insured
- Colour agreed with you before any work starts
- A sealant colour to suit the surroundings
Take a look at our cost guide and our reviews.
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
- Movement that is more than a sealant joint can take
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
Nearby places to Prestwood
More services for Prestwood
Walls and rooflines in Prestwood
With historic houses such as Hughenden Manor (about 3.4 miles south) nearby, there’s older building stock in the area around Prestwood as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. 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 let a flat or house near Great Missenden station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Holy Trinity Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Prestwood is about 5 miles north of High Wycombe, in Buckinghamshire. Jobs in Prestwood get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 263 places in Buckinghamshire are on our list. You can also see our page for Reading, roughly 20 miles from Prestwood.
Every address in HP16 is covered for external mastic. That includes homes and businesses on High Street, Honor Road and Gryms Dyke. Other places close to Prestwood include Stony Green (1 mile south-west), Bryant's Bottom (1 mile west), Great Kingshill (2 miles south), Little Kingshill (2 miles south-east) and Upper North Dean (2 miles south-west). Further out, we also cover Aylesbury (9 miles north), High Wycombe (5 miles south), Chesham (5 miles east), Marlow (9 miles south), Amersham (6 miles east) and Beaconsfield (7 miles south-east).
Landmarks near Prestwood
Locally, jobs take us to homes and businesses close to Travellers Rest pub, Misbourne School and Missenden Abbey Adult Education College, among other places. The nearest railway station is Great Missenden station, roughly 1.2 miles east of the centre. Nearby you will also find Roald Dahl Museum and Story Centre (1.3 miles east) and Great Missenden (2.1 miles east). Open spaces near Prestwood include Prestwood Local Nature Reserve and Coombe Hill.
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Whether the work is at height
- The size of the job
- How many areas need sealing
- The type of sealant required
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- Photos by email, if that’s easy
- Roughly how big the job is
- Whether it’s a home or a business
- What’s wrong with the joints now
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What happens on the day
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. Parking around Prestwood 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.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Move anything stored near the joints
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.