East Sussex · England
Sand Mastic in South Heighton
Professional sand mastic in and around South Heighton, with every bit of old sealant taken out first and a 12-month guarantee.
- Draughty sash windows at the surround
- Failed mastic on an exposed elevation
- Mastic that needs renewing before redecorating
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Check with your local planning authority if your home is listed
- Take care around the mastic when scraping paint
- Avoid patching sand mastic with silicone
- Inspect the joints round the windows every year or so
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Sand mastic in South Heighton
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. Common call-outs are for cracked mastic round a front door frame and crumbling sand mastic round a window, across tenement windows, sash and case windows and period & listed homes.
Outdoor sealant needs dry, clean surfaces, so work on frames around South Heighton is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Location
- South Heighton (BN9)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for South Heighton
Do you cover smaller places like South Heighton?
Yes, South Heighton is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does living near the coast affect sand mastic in South Heighton?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we are using and why.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
South Heighton homes and the weather
South Heighton is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
Schools such as Denton Community Primary School and Nursery are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Newhaven Town station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
South Heighton is about 1 mile north of Newhaven, in East Sussex. For sand mastic in and around South Heighton, please ring 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover East Sussex, South Heighton included. South Heighton is one of 289 places in East Sussex where we work for sand mastic. For nearby work, see our Brighton page.
Work in BN9 works the same way as everywhere else we cover. We also cover the places around South Heighton: Denton (1 mile south), Piddinghoe (1 mile west), Rodmell (3 miles north-west), Telscombe (3 miles west) and Firle (3 miles north). Further out, we also cover Eastbourne (10 miles east), Seaford (3 miles south-east), Lewes (5 miles north-west), Hailsham (10 miles north-east), Uckfield (11 miles north) and Polegate (8 miles east).
Landmarks near South Heighton
Typical jobs here are in homes near Castle Hill, Hampden Arms and UTC@Harbourside. The closest station to South Heighton is Newhaven Town station, about 0.8 miles south of the centre. Other landmarks nearby include Planet Earth Museum (within half a mile south-west) and Arlington Castle (4.8 miles east). For a walk, there’s Itford Hill and Southerham Farm.
When to call us in South Heighton
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Keep an eye out for any of the following:
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
In the older streets around Church of St Leonard, the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- How the colour is chosen
- Whether the sealant suits the joint
- Whether they seal over old material or remove it
- What happens if the job turns out different
Leave it or put it right?
Draughts round a sash window aren’t always the sashes. Open mastic joints round the box can let air in and new mastic seals them. In a small place like South Heighton, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why book with us
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
- Any old sealant cut out fully, not covered over
- 180+ five-star Google reviews
Read how sealant jobs are priced and customer reviews.
How it works
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows for a typical job. In a small place like South Heighton, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Mention any tricky access
- For business premises, tell us about site rules or sign-in
Getting a quote
If you are in South Heighton and need sand mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Advice
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Broken panes
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Period & listed homes
- Tenement windows
- Stone surrounds
- Sash and case windows
- Timber door frames
- Brick reveals
Also in South Heighton
Different surfaces, different methods
Stone surrounds
The stone is treated with care while raking out the old mastic.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.