Hertfordshire · England
Window & door mastic in Shenley, Hertfordshire
Professional window mastic in and around Shenley, with old sealant always removed completely.
- Water coming in at the bottom corners of a door
- Cracked or shrunken mastic around the frame
- Black, perished sealant on frames
About our window mastic in Shenley
From a single sill to a whole house of windows, the work is priced before anything is done. Just call 0345 464 0079 or email us and tell us how many frames there are and how they’re reached. We work on aluminium frames, patio & French doors and window sills, and the jobs we see most are rushed sealant from a window installation and cracked or shrunken mastic around the frame.
In a smaller place like Shenley, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Shenley (WD7)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for window mastic
Call for a quick quote. What matters most is:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Working hours on commercial sites
- Any mould that needs treating
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
What we need to know
When you contact us, these details help:
- Where the job is, and your postcode
- The problem you’ve noticed
- Photos by email, if that is easy
- If it’s domestic, commercial or a hotel
If you are in Shenley and need window mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Window mastic in Shenley: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Wyllyotts Manor (about 4.1 miles east) nearby, there’s older building stock in the area around Shenley as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you look after a building such as Shenley Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Radlett station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Shenley is about 2 miles north of Borehamwood, in Hertfordshire. Every kind of property in Shenley can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Shenley is one of 381 places in Hertfordshire we cover. We also work in London, about 16 miles from Shenley.
Our applicators cover all of the WD7 postcode area for window mastic. If you need window mastic at a property on London Road, Southerton Way and Juniper Gardens or a nearby road, we can help. Main roads around Shenley include the B5378, so getting to you is simple. Other places close to Shenley include Green Street (1 mile south-east), Ridge (2 miles east), Well End (2 miles south-east), Borehamwood (2 miles south) and South Mimms (2 miles east). Within a short drive, we also cover Watford (5 miles south-west), Hemel Hempstead (8 miles north-west), St Albans (4 miles north-west), Welwyn Garden City (8 miles north-east), Harpenden (9 miles north) and Hoddesdon (12 miles east).
What’s near Shenley
Typical jobs here are in homes near Manor Lodge School, Hertswood Academy and The Black Lion pub, among other places. The nearest railway station is Radlett station, roughly 1.4 miles south-west. Well-known places in the area include Radlett and District Museum (1.5 miles south-west) and Shenley Hospital (less than half a mile west). Not far away are Verulamium Lake and Broad Colney Lakes.
What we do, step by step
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours for a few frames, or a day or more for a whole house. A visit to Shenley is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
Getting a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
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 getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Shenley questions
Can you do window mastic in Shenley?
Yes. We work across London and the South East, and Shenley is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Is Shenley within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you reach windows above the ground floor?
Yes, in most cases. We plan safe access before the job.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
I rent my home. Can I book you?
Of course. Check with your landlord; we can send the quote to them too.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
How much does window mastic cost in Shenley?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or send us an email with a short description of the job.
Do you work for landlords and businesses?
Yes. As well as householders, we work for landlords, agents, businesses and hotels.
Also near Shenley
Other services in Shenley
What we’re called out for in Shenley
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
People usually contact us when they notice one of these:
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- Black, perished sealant on frames
- Draughts coming in around windows and doors
For an older house near a landmark such as Church of St Martin, the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- Who turns up on the day
- What happens if the job turns out different
- Is the old sealant removed completely?
- What insurance they hold
Landlord and commercial work in Shenley
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
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.
What the job involves on each surface
Patio & French doors
Water at the foot of a door frame is not always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We look for the cause first.
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone are not designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. In a smaller place like Shenley, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why choose Mr Mastic in Shenley
- We agree the colour with you first
- Sealant colour chosen to suit
- Quality sealants from Arbo and Everbuild
- Fully insured
Take a look at what affects the cost and our reviews.