Buckinghamshire · England
External Mastic in Haddenham
Professional external mastic in and around Haddenham, with old sealant always removed completely.
- Sealant that has lost its bond to the brick or render
- Gaps where render, brick and frames meet
- Rain getting behind render or cladding at a joint
Walls and rooflines in Haddenham
With historic houses such as Waddesdon Manor (about 4.9 miles north) nearby, there’s older building stock in the area around Haddenham as well as newer homes. In older buildings, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Parish Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. If you let a flat or house near Haddenham & Thame Parkway station, outside joints that have cracked can let damp into a rental, so check them between lets.
Haddenham is about 6 miles south-west of Aylesbury, in Buckinghamshire. We provide external mastic to homeowners, landlords and businesses in Haddenham and nearby. Across Buckinghamshire, we cover 263 places, and Haddenham is one of them. For nearby work, see our Oxford page.
Every address in HP17 is within our area for external mastic. Streets in the area include High Street, Station Road and Printers Piece, all of which we cover. We also cover Kingsey (1 mile south), Cuddington (2 miles north), Gibraltar (2 miles north-east), Chearsley (2 miles north-west) and Towersey (2 miles south). Larger places within reach include Aylesbury (6 miles north-east), High Wycombe (12 miles south-east), Chesham (14 miles east), Marlow (15 miles south-east), Amersham (15 miles south-east) and Elmhurst (6 miles north-east).
Around Haddenham
In Haddenham, that means homes and buildings near The Green Dragon Public House. The closest station to Haddenham is Haddenham & Thame Parkway station, about 0.7 miles west. A little further out are Dinton Castle (2.3 miles north-east) and Thame Community Hospital (2.6 miles south-west). For a walk, there’s Snakemoor.
External mastic in Haddenham
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint doesn’t stand out. We work on concrete & block, copings & trims and façade panels, and the jobs we see most are water getting into walls through failed joints and joints where the bead has come unstuck.
Around Haddenham, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
There’s a 12-month guarantee on every job.
- Where
- Haddenham (HP17)
- Wider area
- Buckinghamshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What else we do in Haddenham
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Wash walls gently around the sealant
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
- Point out the joints to other trades
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. A visit to Haddenham is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
Ask for a quote
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
Read more
Common problems we fix in Haddenham
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Common reasons people contact us are:
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
- Rain getting behind render or cladding at a joint
Schools such as Haddenham Community Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Whether they seal over old material or remove it
- Are they insured?
- How much experience the applicator has
- Whether the sealant suits the joint
Common questions in Haddenham
Do you cover smaller places like Haddenham?
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.
I let a flat near Haddenham & Thame Parkway station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Haddenham, along with the rest of our area.
Can you do several jobs on one visit?
Yes. Just list everything you need.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
What affects the quote in Haddenham
For a quick quote, just ask. The main things that affect it are:
- The product the joint needs
- Mould in or behind the old joints
- Access and height
- How much old sealant there is and how hard it is to remove
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- A few pictures by email, if you can
- If someone has resealed it before
- The problem you’ve noticed
- Access, such as stairs, a lift or height
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear quote before we start.
Should I try it myself first?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Why act early in Haddenham
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. Around Haddenham, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why Haddenham customers choose us
- Colour agreed with you before any work starts
- Full insurance on every job
- 180+ five-star Google reviews
- Quality sealants from Arbo and Everbuild
See what affects the cost or our reviews.