Surrey · England
Sandhills Window Mastic
We cover Sandhills for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Whistling draughts around closed windows
How to look after the new joints
A little care helps the new joints last. Our advice:
- Do not paint over the silicone
- Walk round the house once a year and look at the joints
- Wash the frames with mild soapy water
- Keep drainage slots and sill grooves clear
Most silicone sealants won’t take paint, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Window mastic in Sandhills, done properly
Around Sandhills we seal all kinds of frames: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on timber windows & doors, composite doors and aluminium frames, and common reasons people get in touch are old mastic that has gone black or come away and rushed sealant from a window installation.
Outdoor sealant needs dry, clean surfaces, so work on frames around Sandhills is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Big or small, it’s backed by our one-year guarantee.
- Location
- Sandhills (GU8)
- Region
- Surrey
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We will point out any rot we find, as a joiner will need to deal with it.
The process
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work starts. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. In a small place like Sandhills, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
Ask for a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Read more
Why act early in Sandhills
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a small place like Sandhills, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Sandhills
- We are fully insured
- Homes, businesses and hotels
- Anti-fungal sanitary silicone in wet areas
- You choose the colour before work begins
Take a look at what affects the cost or what customers say.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Towns and villages near Sandhills
Other services in Sandhills
Your questions about window mastic in Sandhills
Will you come out to Sandhills?
Yes, Sandhills is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Witley station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Do you guarantee window mastic?
Yes. Our 12-month guarantee covers every job.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few photos.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we are done.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Frames and glazing around Sandhills
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.
Letting a property close to Witley station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For site and facilities teams at buildings such as King Edward's School Witley, its window and door frames need their mastic kept sound, just like a home’s. Homes close to Church of All Saints include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Sandhills is about 8 miles south-east of Farnham, in Surrey. Homes, rented property, offices and hotels in Sandhills can book us for window mastic. Every job comes with our 12-month guarantee. Sandhills is one of 395 places in Surrey we cover. Our Crawley page covers work nearby.
All of GU8 is within our area for window mastic. That includes homes and businesses on Brook Road, Sebastopol Lane and Hatch Lane and the roads around them. If you are just outside Sandhills, we cover Brook (1 mile west), Wormley (1 mile east), Hambledon (1 mile east), Bowlhead Green (1 mile west) and Witley (1 mile north). Within a short drive, we also cover Guildford (9 miles north-east), Woking (13 miles north), Camberley (14 miles north), Farnham (8 miles north-west), Frimley (13 miles north) and Haslemere (4 miles south-west).
What’s near Sandhills
Typical jobs here are in homes near Rodborough, Dog And Pheasant Public House and Witley CofE Controlled Infant School and the streets around them. For rail, the closest station is Witley station, roughly 0.5 miles east. Nearby you will also find Milford Hospital (2.7 miles north-east). Green spaces nearby include Hydon's Ball and Farncombe Wood.
Landlords, agents and businesses in Sandhills
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
What affects the cost of window mastic
Every job gets its own quote. These are the things that affect it:
- The type of sealant required
- How many areas need sealing
- The old material and how stubborn it is
- Access and height
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- The address or postcode of the job
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or send us an email.