Hampshire · England
New Build Mastic in Sandy Down
New build mastic across Sandy Down and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant applied over dusty or wet surfaces
- Shower seals failing in the first year or two
- Plot mastic for developers ahead of handover
Honest limits
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Your warranty claim itself, which is between you and the builder
- Settlement cracks that need a surveyor
- Broken tiles or a split tray
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Windows & doors
- Skirting & floors
- Show homes
- Kitchens
- Plot handovers
- Bathrooms & en suites
New build mastic for homes and businesses in Sandy Down
We carry out plot mastic and second-fix sealing for builders, and snagging reseals for new-home owners. In both, preparation makes the difference. We work on windows & doors, kitchens and skirting & floors, and people most often call us about cracked sealant around new window and door frames and untidy sealant flagged on a snagging list.
Somewhere as small as Sandy Down, new homes tend to be conversions, self-builds or a few houses rather than an estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
You get a 12-month guarantee, the same in Sandy Down as everywhere else we work.
- Place
- Sandy Down (SO41)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. We reseal it with a weatherproof, flexible sealant.
How we quote for new build mastic
You’ll get a clear quote before we start. It takes into account:
- Mould in or behind the old joints
- The old material and how stubborn it is
- The number and length of the joints
- Any working-time requirements on site
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
What we need to know
Photos help, but a description is a good start. Please mention:
- Roughly how big the job is
- A few pictures by email, if you can
- Any previous sealing or DIY work
- The type of property
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
How the visit works
All our tools and materials come with us in the van. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for most snagging lists, longer for a run of plots. Somewhere like Sandy Down 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 start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Preparing for the visit
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
Getting a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Related advice
Do you need new build mastic in Sandy Down?
On many sites, sealant goes on in the final rush before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
The most common problems we see are:
- Second-fix sealing on new plots
- Untidy sealant flagged on a snagging list
- Joints pulling apart as timber shrinks
- Cracked caulk along new skirting
In and around Sandy Down, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Questions to ask before you book
- Whether VAT is included
- Who does the work, and how experienced they are
- How hidden problems are handled
- Are they insured?
Sandy Down: your questions answered
Can you help a landlord with a rental near Brockenhurst station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Is Sandy Down in your area for new build mastic?
Yes. Our work covers London and the South East, and Sandy Down is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Do you take on second-fix sealing for builders?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Are you fully insured?
Yes. We are fully insured for every job we do.
Can you match the sealant colour to my new kitchen or bathroom?
White and clear are the most common, but other colours are available. We choose one to suit the room and agree it with you.
How long will you be here?
That depends on the amount of work, but most jobs take anything from a few hours to several days, depending on the number of plots. We will tell you when we quote.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Joints and finishes in Sandy Down homes
Sandy Down is within about 3 miles of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so any gaps are best picked up early. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near Brockenhurst station, the sealant around baths, showers and frames is worth checking in the first year or two.
Sandy Down is about 3 miles north of Lymington, in Hampshire. We carry out new build mastic for householders, landlords and businesses in Sandy Down and nearby, as part of our work across Hampshire. Our Hampshire coverage runs to 683 places, and Sandy Down is one of them. You can also see our page for Southampton, roughly 11 miles from Sandy Down.
We work across the SO41 postcode area for new build mastic and the streets around it. New build mastic is available to properties on Sandy Down, Lower Sandy Down and Hurstly Lane and the roads around them. Other places close to Sandy Down include Battramsley (1 mile south), Boldre (1 mile south-east), Mount Pleasant (1 mile south-west), Pilley (1 mile south-east) and Warborne (2 miles south-east). Within a short drive, we also cover Eastleigh (15 miles north-east), Totton (9 miles north), Chandler's Ford (15 miles north-east), Hedge End (14 miles north-east), Lymington (3 miles south) and Romsey (14 miles north).
Around Sandy Down
In Sandy Down, that means homes and buildings near The Hobler Public House. For rail, the closest station is Brockenhurst station, about 1.6 miles north of the centre. Other landmarks nearby include Lymington New Forest Hospital (1.9 miles south) and St Barbe Museum and Art Gallery (2.6 miles south). Green spaces nearby include Boldre Foreshore.
Nearby places to Sandy Down
What else we do in Sandy Down
What happens if it’s left?
DIY kits don’t solve the main problems with new-build sealant: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Where a wall is exposed, as many are in small places like Sandy Down, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we will talk you through it.
Why book with us
- Any old sealant cut out fully, not covered over
- Quality sealants from Arbo and Everbuild
- A choice of colours where the product allows
- Over 20 years’ experience
Read what affects the cost or what customers say.