West Sussex · England
Window Mastic in Graffham
We cover Graffham for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Old mastic that has gone black or come away
- Untidy mastic left by window fitters
- Sealant in the wrong colour for the frame
Window mastic for homes and businesses in Graffham
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you are dealing with whistling draughts around closed windows and sealant in the wrong colour for the frame, we can help.
Homes in small places like Graffham often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Graffham (GU28)
- Region
- West Sussex
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Graffham
Mastic ages in the weather. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
The most common problems we see are:
- A bead that doesn’t match the frame
- Rushed sealant from a window installation
- Mastic that’s falling out in pieces
- Cracked internal joints between frame and plaster
If you live in an older home near The Parish Church of St Giles, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- What preparation is included
- What insurance they hold
- Is the old sealant removed completely?
- Whether the sealant suits the joint
Graffham questions
What guarantee comes with window mastic in Graffham?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you cover smaller places like Graffham?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected.
Do you seal inside as well as outside?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly, using a paintable sealant if you want to decorate.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
What affects the cost of window mastic
Every job gets its own quote. These are the things that affect it:
- The number of rooms or windows
- Mould in or behind the old joints
- The number and length of the joints
- The product the joint needs
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.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
- Photos by email, if that is easy
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll take it from there.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Graffham homes and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Cowdray House (about 3.5 miles north-west) are a reminder that the area around Graffham has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Schools such as Graffham CofE Infant School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Graffham is about 9 miles north-east of Chichester, in West Sussex. For window mastic in and around Graffham, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We’re based in Crawley and cover West Sussex, Graffham included. We cover 371 towns and villages across West Sussex, from the larger towns to small villages. For nearby work, see our Portsmouth page, about 20 miles away.
All of GU28 is covered for window mastic, from the main roads to the quietest streets. We cover properties on Guillods Cottages and St Giles Place and the roads around them. Close by, we work in East Lavington (1 mile south-east), Duncton (2 miles east), Selham (2 miles north), South Ambersham (2 miles north) and Rotherbridge (3 miles north-east). Within a short drive, we also cover Worthing (15 miles south-east), Bognor Regis (11 miles south), Chichester (9 miles south-west), Selsey (15 miles south), Littlehampton (11 miles south-east) and Emsworth (13 miles south-west).
Around Graffham
Around Graffham, our work takes us to homes and buildings near The Woodman pub and the streets around them. Other landmarks nearby include Coultershaw Heritage Site (3.1 miles north-east) and Midhurst Community Hospital (3.9 miles north-west). The countryside around Graffham includes Levin Down and Graffham Common.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep timber frames painted
- Keep paint off silicone joints
- Wipe condensation off the frames
- Do not use solvent cleaners on the joint
Try not to touch the new joint while it cures, for as long as we advise. Don’t point a pressure washer at the joints.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
How the job changes by surface
Patio & French doors
Door frames take knocks and movement every time the doors are used. The sealant must cope with it without cracking.
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the new bead is laid against the frame and the wall.
Why act early in Graffham
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. Around Graffham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Graffham customers choose us
- A 12-month guarantee on all work
- Full insurance on every job
- We agree the colour with you first
- A choice of colours where the product allows
Read how sealant jobs are priced or our reviews.
How it works
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a few frames, or a day or more for a whole house. Somewhere like Graffham 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.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
How to get a quote
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.