Hertfordshire · England
Sand mastic for sash & case windows in Mackerye End, Hertfordshire
Our applicators work in Mackerye End on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
About our sand mastic in Mackerye End
We work across Mackerye End renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. We work on period & listed homes, timber door frames and brick reveals, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and silicone on a period window that looks wrong.
Mastic can only go onto a dry, clean joint, so window work in Mackerye End is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Every job is covered by our 12-month guarantee, wherever you are in Hertfordshire.
- Location
- Mackerye End (AL5)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Mackerye End
New sash windows are a major, costly change, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Around Mackerye End, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What you get with us
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
- Fully insured
- Neat joints and a tidy finish
Read our cost guide and customer reviews.
What affects the quote in Mackerye End
The quote reflects the job in front of us. We look at:
- The number of rooms or windows
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- How much there is to do
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Photos by email, if that’s easy
- The rough size of the job
- Access, such as stairs, a lift or height
- The address or postcode of the job
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job.
Common questions in Mackerye End
Is Mackerye End in your area for sand mastic?
Yes. Our work covers London and the South East, and Mackerye End is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Harpenden station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Is sand mastic better than silicone for my windows?
We’ll talk it through with you. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Is the work guaranteed?
Our one-year guarantee covers every job.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Mackerye End, along with the rest of our area.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What happens on the day
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows from start to finish. Somewhere like Mackerye End needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
How to get a quote
Need a quote? Please ring 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and send you a clear quote before we start.
Advice
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Don’t run silicone over sand mastic
- Look over the window mastic once a year
- Clear gutters so water doesn’t pour onto the windows
- Leave the new mastic unpainted
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Frames and glazing around Mackerye End
Historic houses like Shaw's Corner (about 2.3 miles east) are a reminder that the area around Mackerye End has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For an older house near a landmark such as All Saints, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Harpenden station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Mackerye End is about 1 mile north-east of Harpenden, in Hertfordshire. If you need sand mastic in Mackerye End, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We’re based in Crawley and cover Hertfordshire, Mackerye End included. Our area takes in 381 places across Hertfordshire. For nearby work, see our London page (25 miles or so).
All of AL5 is within our area for sand mastic, from the main roads to the quietest streets. Close by, we work in Lea Valley (1 mile south), Porter's End (1 mile north), The Folly (1 mile south-east), Blackmore End (1 mile north-east) and Bower Heath (1 mile north-west). Further out, we also cover Watford (12 miles south), Hemel Hempstead (8 miles south-west), Stevenage (8 miles north-east), St Albans (5 miles south), Welwyn Garden City (6 miles east) and Hitchin (9 miles north).
Near you in Mackerye End
Around Mackerye End, our work takes us to homes and buildings near The Cherry Trees pub, Sir John Lawes School and Lydekker Park. For rail, the closest station is Harpenden station, roughly 1.7 miles south-west of the centre. Other landmarks nearby include St Albans City Hospital (4.8 miles south) and Harpenden Museum (1.9 miles south-west). Green spaces nearby include Wheathampstead Local Nature Reserve.
Nearby places to Mackerye End
What else we do in Mackerye End
Surface by surface
Stone surrounds
Old stone surrounds are often uneven, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Do you need sand mastic in Mackerye End?
Timber swells and shrinks with the weather. That movement opens up the mastic joint little by little.
Most people get in touch after spotting something like this:
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
If you look after a building such as Sauncey Wood Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- What insurance they hold
- Whether VAT is included
- What product goes in the joint
- The length of the guarantee
What we can’t put right
We will not take on work that will not last, so these are the limits:
- Damaged stone surrounds
- Cracked or broken glass
- Sash cords, weights and draught-proofing of the sashes
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
What we seal
- Stone surrounds
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Tenement windows