Surrey · England
External & façade joints in Bishopsgate, Surrey
Movement joints in Bishopsgate need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Joints with sealant missing in places
How we handle external mastic in Bishopsgate
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. If you’re dealing with water getting into walls through failed joints and old sealant gone brittle and cracked, we can put it right.
External sealant needs dry, clean surfaces, so work around Bishopsgate is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You’re covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Place
- Bishopsgate (TW20)
- Region
- Surrey
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
The work is kept neat and contained to the area we’re working on. The job generally takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. In a small place like Bishopsgate, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Clear the area around the work
Get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Read more
What happens if it’s left?
Resealing a run of joints in one go is generally better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. Where a wall is exposed, as many are in small places like Bishopsgate, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- Approved under the ARBOMaster scheme
- Colour picked to suit the job
- Over 20 years’ experience
- White, clear, grey or another colour, product permitting
See our cost guide and customer reviews.
Surface by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Your questions about external mastic in Bishopsgate
Can you do external mastic in Bishopsgate?
Yes. Our work covers London and the South East, and Bishopsgate is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Can you help a landlord with a rental near Egham station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Where are you based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
What’s an expansion joint in brickwork?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What does external mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Nearby places to Bishopsgate
What else we do in Bishopsgate
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Keep movement joints as flexible joints, not mortar
- Deal with leaking gutters that soak the joints below
- Check external joints each spring
- Wash walls gently around the sealant
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Outside joints around Bishopsgate
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Frogmore House (about 2.5 miles north) are a reminder that the area around Bishopsgate has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like St John's Beaumont School? Then larger buildings have long runs of movement joint that eventually need resealing. In the older streets around Royal Chapel of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Bishopsgate is about 2 miles north-west of Egham, in Surrey. For external mastic in and around Bishopsgate, it’s easy to get a quote: please phone 0345 464 0079 or email us. We are based in Crawley and cover Surrey, Bishopsgate included. Our Surrey coverage runs to 395 places, Bishopsgate among them. There’s also a page for Reading, roughly 17 miles from Bishopsgate.
Here we cover the TW20 postcode area for external mastic. External mastic is available to properties on Bishopsgate Road, Ridgemead Road and Wick Lane. We also cover Englefield Green (1 mile south-east), Egham Wick (1 mile south), Old Windsor (1 mile north), Wraysbury (2 miles north-east) and Egham (2 miles south-east). Within a short drive, we also cover Guildford (13 miles south), Woking (9 miles south), Camberley (10 miles south-west), Epsom (15 miles south-east), Ewell (15 miles south-east) and Walton-on-Thames (9 miles south-east).
Local landmarks in Bishopsgate
Around Bishopsgate, our work takes us to homes and buildings near The Barley Mow Public House, Englefield Green Infant School and Nurseries and Windsor Great Park. The nearest railway station is Egham station, about 1.8 miles east of the centre. Nearby you will also find Berkshire Yeomanry Museum (2.4 miles north-west) and Windsor Castle (3.2 miles north). The countryside around Bishopsgate includes St Ann's Hill and Virginia Water Lake.
Quotes for external mastic in Bishopsgate
For a quick quote, just ask. The main things that affect it are:
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
- How many areas need sealing
- Any working-time requirements on site
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Any previous sealing or DIY work
- The type of property
- Any access issues, like height or stairs
- The problem you’ve noticed
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
What we are called out for in Bishopsgate
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
- Gaps where render, brick and frames meet
Rented homes near Egham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Are they insured?
- What preparation is included
- How hidden problems are handled
- Whether VAT is included