Hertfordshire · England
Markyate Window Mastic
Window mastic in Markyate from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Leaking joints at the ends of sills
- Draughts coming in around windows and doors
- Cracked internal joints between frame and plaster
How we handle window mastic in Markyate
Whether it’s one leaking patio door or every frame on the house, the work is priced before anything is done. Just ring 0345 464 0079 or send us an email and tell us how many frames there are and how they’re reached for window mastic in Markyate. We are often asked to deal with leaking joints at the ends of sills and mastic that has split away from the wall, across timber windows & doors, window sills and aluminium frames.
In a smaller place like Markyate, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. That is hard on the mastic around frames and sills.
There’s a 12-month guarantee on every job, large or small.
- Location
- Markyate (AL3)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match keeps the clean look.
Also near Markyate
More services for Markyate
Common problems we fix in Markyate
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
If you can see any of these, it’s time to have the joints looked at:
- Gaps between the frame and the inside reveal
- Old mastic that has gone black or come away
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
If you let a flat or house near Luton Airport Parkway station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- How long to leave it before use
- The length of the guarantee
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
Common questions in Markyate
Can you do window mastic in Markyate?
Yes. We work across London and the South East, and Markyate is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
I let a flat near Luton Airport Parkway station. Can you help?
Yes. We work for landlords and agents as well as homeowners. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
How long before the joint can be used?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
Can you do the inside joint as well?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
Can new sealant go over the old?
No. The old sealant always comes out first.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We check where the draught is before any work starts.
How it works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. For a job in Markyate, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Tell us about any water getting in
- Move anything stored near the joints
- Tell us if parking is tricky
Getting a quote
If you are in Markyate and need window mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before we start.
Related advice
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Clean frames with a soft cloth and soapy water
- Walk round the house once a year and look at the joints
- Keep drainage slots and sill grooves clear
- Keep timber frames painted
Most silicone sealants will not take paint, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Markyate homes and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Markyate Methodist Church, the joint between an old wall and a newer frame is generally the first place rain gets in. If you look after a building such as Markyate Village School and Nursery, the mastic around its windows and doors needs looking after like any other building’s.
Markyate is in Hertfordshire. Every kind of property in Markyate can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Markyate is one of 381 places in Hertfordshire we cover. For nearby work, see our London page.
Every address in AL3 is within our area for window mastic, from the main roads to the quietest streets. Whether your property is on High Street, London Road and Sebright Road or a nearby road, we can help. We also cover Roe End (1 mile south-west), Flamstead (2 miles south-east), Friar's Wash (2 miles south-east) and Trowley Bottom (2 miles south-east). Within a short drive, we also cover Watford (12 miles south), Hemel Hempstead (6 miles south), Stevenage (13 miles north-east), St Albans (8 miles south-east), Welwyn Garden City (12 miles east) and Harpenden (5 miles east).
Landmarks near Markyate
Around Markyate, our work takes us to homes and buildings near The Local pub. The closest station to Markyate is Luton Airport Parkway station, roughly 3.8 miles north-east of the centre. A little further out are Mossman Collection (2.6 miles north-east) and Luton Castle (3.3 miles north-east). For a walk, there’s Landpark Wood.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
If you manage several properties in or around Markyate, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
How we quote for window mastic
Your quote is based on your job. We look at:
- How much old sealant there is and how hard it is to remove
- The type of sealant required
- The amount of work
- When we can work, for business premises
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll send you a clear quote for the lot.
What to tell us for a quote
When you contact us, it’s useful to know:
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- Whether it has been sealed before
- Roughly how big the job is
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.