Surrey · England
Dora's Green External Mastic
External mastic across Dora's Green and nearby, with old sealant always removed completely and a 12-month guarantee.
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
- Sealant pulling away from one side of the joint
About our external mastic in Dora's Green
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. If you have joints pointed up with cement by mistake and movement joints with cracked, split or missing sealant, we can help.
External sealant needs dry, clean surfaces, so work around Dora's Green is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Big or small, it’s backed by our one-year guarantee in Dora's Green and across Surrey.
- Where
- Dora's Green (GU10)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Honest limits
Sealant isn’t the answer to every problem, and we’ll tell you before we start. Sealant won’t put right:
- Subsidence or other structural problems
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Concrete & block
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
Common questions in Dora's Green
Do you cover Dora's Green for external mastic?
Yes, Dora's Green is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
Do you cover smaller places like Dora's Green?
Yes, Dora's Green is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
Can I add another job to the visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Is it OK to fill a movement joint with cement?
No. Cement or mortar can’t stretch, so the joint stops doing its job. If it has already been filled, we can usually cut it out and reseal it.
Are you fully insured?
Yes, we are fully insured for every job we do.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we’re using and why.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Places near Dora's Green
What else we do in Dora's Green
Landlord and commercial work in Dora's Green
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Common problems we fix in Dora's Green
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Most people get in touch when they notice one of these:
- Sealant that has lost its bond to the brick or render
- Damp patches traced to an open external joint
- Joints with sealant missing in places
- Movement joints filled with mortar instead of sealant
For site and facilities teams at buildings such as Crondall Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What to look for in a quote
- Is VAT in the price?
- What product goes in the joint
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- The number of rooms or windows
- The old material and how stubborn it is
- Any mould that needs treating
- Whether the work is at height
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- Pictures of the joints, sent by email
- If someone has resealed it before
- Whether it’s a home or a business
If you’re in Dora's Green and need external mastic, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Have failed joints looked at early
- Keep soil, plants and ivy away from the joints
- Fix overflowing gutters above sealed joints
- Show decorators and builders where the movement joints are
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.
External mastic in Dora's Green: local notes
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. Historic houses like Farnham Castle (about 1.7 miles south-east) are a reminder that the area around Dora's Green has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Farnham station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around St Mary's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Dora's Green is about 2 miles north-west of Farnham, in Surrey. Dora's Green gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Dora's Green is one of 395 towns and villages in Surrey we cover for external mastic. Reading is on our list too, around 16 miles away.
All of GU10 is covered for external mastic. We also cover Warren Corner (1 mile north), Redlands (1 mile north-west), Ewshot (1 mile north), Dippenhall (1 mile south) and Crondall (1 mile west). Within a short drive, we also cover Guildford (11 miles east), Woking (13 miles north-east), Camberley (9 miles north-east), Frimley (8 miles north-east), Haslemere (11 miles south-east) and Ash (5 miles east).
Local landmarks in Dora's Green
In Dora's Green, that means homes and buildings near Weydon School. For rail, the closest station is Farnham station, about 2.3 miles south-east of the centre. Other landmarks nearby include Powderham Castle (1.1 miles south-west) and Museum of Farnham (1.8 miles south-east). The countryside around Dora's Green includes Aunt's Pool and Farnham Park.
The process
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building, including the tidy-up. Somewhere as small as Dora's Green, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Mention if the joints have been sealed before
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.