Surrey · England
Crondall External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Crondall, with a one-year guarantee on every job. Ask us for a quote.
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
What affects the cost of external mastic
We do not publish a price list. What we look at:
- The size of the job
- The number of rooms or windows
- Access and height
- The old material and how stubborn it is
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- How we’d reach the joints
- Roughly how big the job is
- Any previous sealing or DIY work
- Where the property is
If you’re in Crondall and need external mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before we start.
About our external mastic in Crondall
For buildings in Crondall, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. We’re often asked to deal with cracked joints where brick meets render or frames and brick movement joints where the sealant has split, on copings & trims, joints between brick and frames and concrete & block.
External sealant needs dry, clean surfaces, so work around Crondall is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Crondall (GU10)
- Region
- Surrey
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Crondall, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- A choice of colours where the product allows
- Full insurance on every job
- Anti-fungal sanitary silicone in wet areas
- Trusted Arbo and Everbuild sealants
Take a look at what affects the cost or customer reviews.
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, do the work and tidy away. It usually takes anything from a few hours to several days, depending on the building. Somewhere as small as Crondall, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires 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
- Try not to wet indoor joints just before the visit
- Clear the area around the work
- Keep pets and children clear of the area while we work
Get a quote
Asking for a quote is easy: let us know what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Advice
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Questions from Crondall
Do you cover smaller places like Crondall?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Farnham station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you work at height?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we will confirm what’s needed.
How long does external mastic take?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Larger jobs naturally take longer.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall so the joint blends in. There’s a wide choice of exterior colours.
Where are you based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
How do I get a quote for external mastic in Crondall?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Do you need external mastic in Crondall?
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Keep an eye out for any of the following:
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
- Rigid filler in a joint that should flex
Managing a site like Crondall Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Whether they seal over old material or remove it
- What guarantee comes with the work
- How much experience the applicator has
- Which colour the sealant will be
Landlords, agents and businesses in Crondall
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we are fully insured.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What sealant work cannot fix
It helps to know what we cannot do too:
- Walls that need new movement joints cut into them
- Structural movement, which needs a surveyor or engineer
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Crondall buildings and the weather
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 Farnham Castle (about 2.7 miles east) nearby, there’s older building stock in the area around Crondall 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.
If you let a flat or house near Farnham station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of All Saints include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Crondall is about 3 miles south of Fleet, in Surrey. Homes, rented property, offices and hotels in Crondall is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Crondall is one of 395 places in Surrey where we work for external mastic. We also work in Reading, around 16 miles away.
We cover every part of the GU10 postcode area for external mastic. You’ll find streets such as Church Street, The Borough and Glebe Road. We also cover Redlands (1 mile north-east), Bowling Alley (1 mile north), Dora's Green (1 mile east), Warren Corner (1 mile east) and Mill Lane (1 mile north). We also work in nearby towns such as Guildford (12 miles east), Woking (14 miles north-east), Camberley (9 miles north-east), Farnham (3 miles south-east), Frimley (8 miles north-east) and Haslemere (12 miles south-east).
Local landmarks in Crondall
We work in homes and buildings around The Plume Of Feathers Public House and St Nicholas' School. Crondall’s nearest station is Farnham station, about 3.3 miles south-east. Nearby you will also find Museum of Farnham (2.8 miles south-east) and Hart Shopping Centre (3.4 miles north). The countryside around Crondall includes Beacon Hill and Aunt's Pool.