Buckinghamshire · England
External Mastic in Swan Bottom
External mastic across Swan Bottom and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
How we handle external mastic in Swan Bottom
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. We work on brickwork movement joints, copings & trims and render & cladding joints, and common reasons people get in touch are rigid filler in a joint that should flex and rain getting behind render or cladding at a joint.
Older homes in small places like Swan Bottom may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Swan Bottom (HP16)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Swan Bottom
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. Where a wall is exposed, as many are in small places like Swan Bottom, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- Colour picked to suit the job
- Fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
See what affects the cost and what customers say.
Your questions about external mastic in Swan Bottom
Do you cover smaller places like Swan Bottom?
Yes, Swan Bottom is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Swan Bottom for external mastic?
Yes, Swan Bottom is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Are you insured?
Yes. Mr Mastic is fully insured.
Can I do it myself?
You can, for simple jobs. 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.
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.
How much does external mastic cost in Swan Bottom?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or email us and let us know what needs doing and where.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
Signs you need external mastic in Swan Bottom
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
These are the problems we are asked about most:
- Sealant that has lost its bond to the brick or render
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
In the older streets around Parish Church of St John the Baptist, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- What guarantee comes with the work
- Who does the work, and how experienced they are
- When the joint can take water or movement
- Which colour the sealant will be
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and helps it last.
Also near Swan Bottom
What else we do in Swan Bottom
Quotes for external mastic in Swan Bottom
The quote reflects the job in front of us. We take into account:
- Mould in or behind the old joints
- How easy the joints are to reach
- The number and length of the joints
- Working hours on commercial sites
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll explain what it covers.
Helping us quote
When you call or email, these details help:
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- Photos by email, if that is easy
Want a quote for external mastic? Please ring 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Tell anyone working on the walls about the movement joints
- Fix overflowing gutters above sealed joints
- Check the sealant is paintable before painting near it
- Look over the joints every year, ideally after winter
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Outside joints around Swan Bottom
With historic houses such as Cholesbury Manor House (about 2.1 miles north-east) nearby, there’s older building stock in the area around Swan Bottom as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Great Missenden station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Lee Common Church of England School, its movement joints, gutters and trims need looking after like any other building’s.
Swan Bottom is about 4 miles north-west of Chesham, in Buckinghamshire. Whether you are in the middle of Swan Bottom or further out, external mastic is available for homes and businesses alike. Swan Bottom is one of 263 towns and villages in Buckinghamshire where we work for external mastic. There’s also a page for Reading, about 23 miles away.
We cover every part of HP16 for external mastic. We also cover Lee Common (1 mile south-east), St Leonards (1 mile north-east), Ballinger Common (1 mile south-east), Buckland Common (2 miles north-east) and Cholesbury (2 miles north-east). Within a short drive, we also cover Aylesbury (7 miles north-west), High Wycombe (8 miles south), Chesham (4 miles south-east), Marlow (12 miles south), Amersham (6 miles south-east) and Beaconsfield (9 miles south).
Around Swan Bottom
In Swan Bottom, that means homes and buildings near The Old Swan pub and the streets around them. The closest station to Swan Bottom is Great Missenden station, roughly 2.5 miles south. Other landmarks nearby include Roald Dahl Museum and Story Centre (2.6 miles south) and Chiltern Hospital (3.4 miles south). Green spaces nearby include Dancersend Nature Reserve and Haddington Hill.
How the visit works
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Swan Bottom needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
How to get a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or drop us an email.