Hertfordshire · England
Sand mastic for sash & case windows in Essendon, Hertfordshire
Professional sand mastic in and around Essendon, with every bit of old sealant taken out first and a one-year guarantee.
- Gaps where the frame meets the masonry
- Old sand mastic that has cracked, crumbled or fallen out
- Wind and rain getting in round a sash window
What we cannot put right
A few problems are outside what sealant work can do:
- Crumbling stone or brickwork round the window
- Decisions on consent for listed homes
- Timber that has rotted
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
Sand mastic in Essendon
We work across Essendon renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. Typical jobs include silicone on a period window that looks wrong and gaps round a timber door in stone or brick, across period & listed homes, sash and case windows and tenement windows.
Homes in small places like Essendon often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Essendon (AL9)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
We work for landlords and agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
We also work for property managers and facilities teams. Several sites can be quoted together, and we are fully insured for the work.
The process
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes a few hours per window, depending on the condition of the joints from start to finish. For a village or hamlet like Essendon, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Advice
Your questions about sand mastic in Essendon
Is Essendon in your area for sand mastic?
Yes. Our work covers London and the South East, and Essendon is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Can you help a landlord with a rental near Bayford station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
How long does sand mastic take?
That depends on the amount of work, but as a guide it takes a few hours per window, depending on the condition of the joints. We will give you a better idea when we quote.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Your local planning authority can say if consent is needed for listed or conservation-area properties.
Which is right for my windows, sand mastic or modern sealant?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames generally get a flexible sealant.
Do you offer different sealant colours?
Most of the time, yes. We will explain which colours are available.
Why it’s worth doing now in Essendon
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. Around Essendon, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Why us?
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
- One-year guarantee on every job
- Homes, businesses and hotels
Take a look at our cost guide or customer reviews.
How the job changes by surface
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
What we’re called out for in Essendon
Rain on the window surround works into any crack and pushes it out. Exposed elevations generally fail first.
The problems people generally mention when they call are:
- Gaps between timber frames and stone or brick
- Cracked mastic round a front door frame
- Crumbling sand mastic round a window
- Silicone on a period window that looks wrong
If you let a flat or house near Bayford station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- How much experience the applicator has
- Whether the sealant suits the joint
- Which colour the sealant will be
- How the joint is cleaned and prepared
Also near Essendon
Also in Essendon
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Windows and doors in Essendon
With historic houses such as Hatfield House (about 2.4 miles west) nearby, there’s older building stock in the area around Essendon as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Essendon CofE (VC) Primary School, its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of St Mary the Virgin, the joint between an old wall and a newer frame is usually the first place rain gets in.
Essendon is about 3 miles south-east of Welwyn Garden City, in Hertfordshire. From the centre of Essendon to the outskirts, sand mastic is available for homes and businesses alike. 381 places in Hertfordshire are on our list. You can also see our page for London, roughly 18 miles from Essendon.
Our applicators cover all of the AL9 postcode area for sand mastic and the streets around it. You will find streets such as Rectory Close, Church Street and School Lane, and we cover them all. Nearby, we also carry out sand mastic in West End (1 mile west), Little Berkhamsted (1 mile south-east), Letty Green (2 miles north-east), East End Green (2 miles north-east) and Bayford (2 miles east). Within a short drive, we also cover Watford (13 miles south-west), Hemel Hempstead (13 miles west), Stevenage (10 miles north), St Albans (8 miles west), Bishop's Stortford (15 miles north-east) and Welwyn Garden City (3 miles north-west).
Landmarks near Essendon
Around Essendon, our work takes us to homes and buildings near The Salisbury Crest Public House. Essendon’s nearest station is Bayford station, roughly 2.5 miles east. Well-known places in the area include Queen Elizabeth II Hospital (2 miles north-west) and The Bunker at Hatfield Police Station (3.6 miles west). Not far away are Willowmead.