Hertfordshire · England
External Mastic in Bedwell
External mastic in Bedwell from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed sealant between panels on a façade
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Access and height
- How many rooms, windows or areas are involved
- The product the joint needs
- The old material and how stubborn it is
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
When you call or email, these details help:
- How we’d reach the joints
- A few photos by email, if you can
- Where the job is, and your postcode
- Roughly how big the job is
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
External mastic in Bedwell, done properly
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on copings & trims, render & cladding joints and joints between brick and frames, and common reasons people get in touch are leaking joints around cladding and façade panels and water getting into walls through failed joints.
Homes around Bedwell range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Location
- Bedwell (SG1, SG2)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Subsidence or other structural problems
- Render that is blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Where we work in Bedwell
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
- Concrete & block
- Brickwork movement joints
Why deal with it now?
Running new sealant over the old bead rarely lasts. The new layer cannot bond properly to old, weathered material, so we always take the old sealant out. Around Bedwell, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
What you get with us
- Tidy, careful work
- 12-month guarantee on every job
- Trusted Arbo and Everbuild sealants
- Old sealant always removed completely
Take a look at how sealant jobs are priced and what customers say.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It normally takes a few hours for a handful of joints, longer for a whole elevation. In a smaller place like Bedwell, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Clear items away from the joints we’re working on
- Mention any tricky access
- Mention any parking rules near the property
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or send us an email.
Related advice
How the job changes by surface
Cladding and façade panels
Cladding and façade panels are generally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Bedwell buildings and the weather
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Knebworth House (about 2.4 miles south-west) are a reminder that the area around Bedwell has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Homes close to Parish Church of St Andrew and St George include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Stevenage station, split movement joints are easy to miss on a rental until damp shows inside.
Bedwell is about 1 mile south-west of Stevenage, in Hertfordshire. Every kind of property in Bedwell is covered for external mastic. The work is guaranteed for a year. Bedwell is one of 381 places in Hertfordshire where we work for external mastic. Our London page covers work nearby, about 28 miles away.
All of SG1 and SG2 is within our area for external mastic. Streets in the area include Fox Road, Penn Road and Silam Road, and we cover them all. Main roads around Bedwell include the A1155, which makes travel easy. We also cover Stevenage (1 mile north-east), Pin Green (1 mile north), Chells (1 mile north-east), Rooks Nest (1 mile north) and St Nicholas (1 mile north-east). Further out, we also cover St Albans (12 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (7 miles south), Harpenden (9 miles south-west), Hitchin (5 miles north-west) and Hoddesdon (13 miles south-east).
Local landmarks in Bedwell
Around Bedwell, our work takes us to homes and buildings near The Heathcote School, Marriotts School and The Standard Bearer pub. The closest station to Bedwell is Stevenage station, roughly 0.7 miles west of the centre. Other landmarks nearby include Wymondley Castle (3.2 miles north-west) and Stevenage Museum (less than half a mile south-west). Not far away are Pryor's Wood.
What we are called out for in Bedwell
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
People usually contact us when they notice something like this:
- Cracked joints where brick meets render or frames
- Joints with sealant missing in places
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
Managing a site like Broom Barns Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- Whether VAT is included
- Whether they seal over old material or remove it
Nearby places to Bedwell
Also in Bedwell
Bedwell: your questions answered
Should the sealant in an older Bedwell home be renewed?
Often, yes: cracked, shrunken or mouldy sealant has done its job. The key is cutting all the old sealant out, as new sealant will not bond to it.
Can you help a landlord with a rental near Stevenage station?
Yes. We work for landlords and letting agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Do you work in Bedwell?
Yes. We work in Bedwell, as part of our work across South East England, London and Scotland. To book, call 0345 464 0079 or send us an email.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or send us an email with a short description of the job.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides with primer where required.
Landlords, agents and businesses in Bedwell
Landlords and letting agents in Bedwell can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.