West Berkshire · England
Sand mastic for sash & case windows in Downend, West Berkshire
We cover Downend for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Gaps round a timber door in stone or brick
- Failed mastic on an exposed elevation
- Crumbling sand mastic round a window
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
How we handle sand mastic in Downend
We work across Downend renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. If you are dealing with patchy fillers round a sash window and mastic worn away on windows facing the weather, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Downend is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
There’s a 12-month guarantee on every job, large or small.
- Where
- Downend (RG20)
- Wider area
- West Berkshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Downend
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. Where a wall is exposed, as many are in small places like Downend, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or email us and we’ll talk you through it.
Why Downend customers choose us
- We leave the area clean and tidy
- Fully insured
- One-year guarantee on every job
- Any old sealant cut out fully, not covered over
Take a look at what affects the cost and what customers say.
What the job involves on each surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
How it works
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours per window, depending on the condition of the joints. Somewhere as small as Downend, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
How to get a quote
We quote each job on its own. Simply ring 0345 464 0079 or email us and describe the job.
Related advice
When something else is needed
We’d rather tell you now than do work that won’t last, so these are the limits:
- Cracked or broken glass
- Decisions on consent for listed homes
- Sash cords, weights and draught-proofing of the sashes
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Where we work in Downend
- Sash and case windows
- Brick reveals
- Tenement windows
- Timber door frames
- Stone surrounds
- Period & listed homes
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Common problems we fix in Downend
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
If you can see any of these, it’s time to have the joints looked at:
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps where the frame meets the masonry
- Mastic worn away on windows facing the weather
Managing a site like Chieveley Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Before booking anyone
- Is the old sealant removed completely?
- What happens if the job turns out different
- Are they insured?
- How the colour is chosen
Towns and villages near Downend
Other services in Downend
Common questions in Downend
Is Downend in your area for sand mastic?
Yes. Our work covers London and the South East, and Downend is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
What guarantee comes with sand mastic in Downend?
All our work, in Downend and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Windows and doors in Downend
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 Shaw House (about 4.2 miles south) nearby, there’s older building stock in the area around Downend 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.
In the older streets around Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Downend is about 5 miles north of Newbury, in West Berkshire. Every kind of property in Downend can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our West Berkshire coverage runs to 155 places, and Downend is one of them. Our Reading page covers work nearby.
We work across RG20 for sand mastic. We cover properties on Downend Lane, Bardown and Northfields. Neighbouring places we cover for sand mastic include Chieveley (1 mile south), North Heath (1 mile south-west), World's End (1 mile north-east), Peasemore (2 miles north-west) and Beedon (2 miles north). Further out, we also cover Newbury (5 miles south), Thatcham (5 miles south-east), Burghfield Common (12 miles south-east), Speenhamland (5 miles south), Hungerford (10 miles south-west) and Calcot (12 miles east).
Landmarks near Downend
In Downend, that means homes and buildings near The Wheatsheaf pub and the streets around them. Other landmarks nearby include Hampstead Norris Castle (3.3 miles east) and West Berkshire Community Hospital (4.7 miles south). Not far away are Snelsmore Common.