West Sussex · England
Window Mastic in Hardham
Our applicators work in Hardham on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Leaking joints at the ends of sills
- Sealant in the wrong colour for the frame
- Draughty joints inside around the window
Quotes for window mastic in Hardham
For a quick quote, just ask. The main things that affect it are:
- Whether the work is at height
- Any working-time requirements on site
- Any mould that needs treating
- How many areas need sealing
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What we need to know
Photos help, but a description is a good start. Please mention:
- A few photos by email, if you can
- The address or postcode of the job
- If someone has resealed it before
- The problem you’ve noticed
For window mastic in Hardham, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
How we handle window mastic in Hardham
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. The sealant then grips the two sides it should. Typical jobs include cracked or shrunken mastic around the frame and cold air getting in at the frame edge, across window sills, aluminium frames and uPVC windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around Hardham is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Hardham (RH20)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. It usually takes most of a day for a typical house, less for a few frames. Somewhere as small as Hardham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
Getting a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved.
Read more
Towns and villages near Hardham
More services for Hardham
How the job changes by surface
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
What we’re called out for in Hardham
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Common reasons people contact us are:
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
- Sealant in the wrong colour for the frame
- Mastic that has split away from the wall
Schools such as St James' CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- What product goes in the joint
- When the joint can take water or movement
- Who turns up on the day
- What happens if the job turns out different
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Honest limits
Before you book, it’s worth knowing the limits too:
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
- Soft or decayed wood in the frame
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Composite doors
- Window sills
- Aluminium frames
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Make sure the drainage slots are not blocked
- Use gentle cleaners on frames and sealant
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Hardham homes and the weather
With historic houses such as Old Place Manor (about 1 mile north-east) nearby, there’s older building stock in the area around Hardham as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
In the older streets around St Botolph's Church, the joint between an old wall and a newer frame is usually the first place rain gets in. For landlords with property near Pulborough station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Hardham is about 10 miles north of Littlehampton, in West Sussex. Wherever you are in the RH20 postcode area, we can carry out window mastic at your property. We cover 371 towns and villages across West Sussex. Crawley is on our list too, about 18 miles from Hardham.
All of RH20 is covered for window mastic. Neighbouring places we cover for window mastic include Coldwaltham (1 mile south-west), Pulborough (1 mile north-east), Watersfield (2 miles south-west), Fittleworth (2 miles north-west) and Lower Horncroft (2 miles west). Within a short drive, we also cover Horsham (12 miles north-east), Worthing (10 miles south-east), Bognor Regis (13 miles south-west), Chichester (13 miles south-west), Littlehampton (10 miles south) and Shoreham-by-Sea (14 miles south-east).
Landmarks near Hardham
Typical jobs here are in homes near The White Hart Public House and the streets around them. Hardham’s nearest station is Pulborough station, about 0.7 miles north-east. Well-known places in the area include Amberley Museum (3.6 miles south) and Coates Castle (2.8 miles west). The countryside around Hardham includes Bignor Hill and Amberley Wildbrooks RSPB Reserve.
Questions from Hardham
Is Hardham within the area you cover?
Yes, Hardham is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is Hardham in your area for window mastic?
Yes. Our work covers London and the South East, and Hardham is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Can you get sealant to suit coloured frames?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we’ll plan for it.
Do you have insurance?
Yes. We are fully insured.
How long before the joint can be used?
Cure times vary by product. Before we leave, we will tell you the cure time.