Buckinghamshire · England
External & façade joints in Hazlemere, Buckinghamshire
Sealing brickwork movement joints, render, cladding and façade joints in Hazlemere, with a one-year guarantee on every job. Call for a quick quote.
- Plants rooting in failed movement joints
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. A visit to Hazlemere 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, ring 0345 464 0079 or send us an email.
Advice
External mastic for homes and businesses in Hazlemere
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. We work on joints between brick and frames, brickwork movement joints and concrete & block, and the jobs we see most are sealant pulling away from one side of the joint and rain getting behind render or cladding at a joint.
In a smaller place like Hazlemere, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. That’s where gutter joints and wall joints tend to fail first.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Hazlemere (HP15)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Nearby places to Hazlemere
What else we do in Hazlemere
Common questions in Hazlemere
Can you do external mastic in Hazlemere?
Yes, Hazlemere is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Do you work for landlords with property near High Wycombe station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
When is the sealant fully cured?
Cure times vary by product and the temperature. Before we leave, we will tell you the cure time.
Do you work at height?
It depends on the building. Where joints can be reached safely, we will do them. Tell us about the building and we’ll confirm what access is needed.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Why act early in Hazlemere
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. Homes in smaller places like Hazlemere can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
What you get with us
- Tidy, careful work
- Full insurance on every job
- More than 20 years in sealant work
- 180+ five-star Google reviews
Read our cost guide or customer reviews.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
- Leave the joints unpainted unless we’ve said otherwise
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Once a joint cannot move, the wall finds another way, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
What affects the cost of external mastic
We do not publish a price list. The quote depends on:
- The product the joint needs
- Mould in or behind the old joints
- The old material and how stubborn it is
- The amount of work
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
You don’t need to know the technical terms. Just tell us:
- How we’d reach the joints
- Whether it has been sealed before
- Whether it’s a home or a business
- Pictures of the joints, sent by email
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work.
Outside joints around Hazlemere
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Hughenden Manor (about 2.1 miles west) nearby, there’s older building stock in the area around Hazlemere as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Schools such as Sir William Ramsay School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to High Wycombe station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Hazlemere is about 2 miles north-east of High Wycombe, in Buckinghamshire. We provide external mastic to householders, landlords and businesses in Hazlemere. We cover 263 towns and villages across Buckinghamshire, large and small. For nearby work, see our Reading page.
Work in HP15 is quoted and booked the same way as anywhere else. External mastic is available to properties on Market Parade, Vine Close and Sycamore Way. We also cover the places around Hazlemere: Tylers Green (1 mile south-east), Widmer End (1 mile north-west), Four Ashes (1 mile west), Terriers (1 mile south-west) and Spurlands End (1 mile north). Larger places within reach include Aylesbury (12 miles north), Chesham (6 miles north-east), Marlow (6 miles south-west), Amersham (5 miles east), Beaconsfield (4 miles south-east) and Chalfont St Peter (7 miles south-east).
Around Hazlemere
In Hazlemere, that means homes and buildings near Hazlemere Church of England Combined School and Three Horseshoes pub and the streets around them. For rail, the closest station is High Wycombe station, roughly 2.1 miles south-west. Other landmarks nearby include High Wycombe Castle (2.1 miles south-west) and Eden (2.5 miles south-west). Open spaces near Hazlemere include Gomm's Wood.
Signs you need external mastic in Hazlemere
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Look out for any of the following:
- Weeds or debris growing in open joints
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
Homes close to Holy Trinity Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- What happens if the job turns out different
- How long to leave it before use
- Whether you can choose the colour
- Are they insured?
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.