Southbourne mastic sealing
Commercial sealant work in Southbourne for contractors, FMs and building owners: mastic sealing for building owners, managing agents and housing associations, with a fixed quote first.
- Occupiers reporting cold air round windows
- Complaints coming in block by block
- A mix of products and colours from past repairs
Mastic sealing across Southbourne
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
About our mastic sealing in Southbourne
We work for building owners, landlords with commercial or block portfolios, managing agents and housing associations. Many prefer a planned programme to one-off visits, with each block quoted and scheduled in turn. We work on communal kitchens and washrooms, shopfronts below residential blocks and window and door perimeters on blocks, and the failures we are asked to look at most are window mastic that has split and shrunk and draughts at frames across a block. A specialist sealant contractor works differently from a general builder: on jobs in Southbourne, preparation and product choice get the time they need.
For landlords and associations with stock in and around Southbourne, grouping buildings into one visit saves travel. Send the addresses and photos and we will quote for all of them together.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Place
- Southbourne (PO10)
- Wider area
- West Sussex
- Guarantee
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Surface by surface
Estate-wide resealing programmes
Using the same products throughout keeps the estate consistent.
External movement joints
Failed sealant is removed, backing rod inserted to control depth and the joint resealed with a grade whose movement class fits.
Common problems we fix in Southbourne
Sunlight and weather break mastic down over time. It stiffens, stops stretching and cracks most of all on the sunniest and most exposed elevations.
It’s worth sending us details if you spot any of the following:
- Worn sealant at communal door frames
- Failed external movement joints
- Old repairs sealed over failed mastic
- The same joint failures repeated across a portfolio
Site managers at schools like Southbourne Junior School can fit frame mastic into the summer works.
What to look for in a quote
- How the joint faces will be prepared and primed
- Their plan for phasing and protecting the area
- The named product and why it was chosen
- Their approach to joint depth and backing
When it isn’t the sealant
Being straight saves everyone time. New sealant won’t cure:
- Misted or failed double-glazed units
- Masonry that has broken away beside the joint
- Failed window or door frames, which need a window contractor
Not sure which it is? You can phone 01277 525 020 or send details through our quote form and we will tell you honestly.
Where we work in Southbourne
- Window and door perimeters on blocks
- Communal entrances and stairwells
- Shopfronts below residential blocks
- External wall and movement joints
- Communal kitchens and washrooms
- Balcony and threshold joints
For owners and agents in Southbourne
With the shore within about 1 mile, Southbourne counts as a coastal location. For owners and agents with buildings near the sea, exposed elevations are where frame mastic fails first. At about 57 miles from central London, Southbourne is within reach of the capital. Managed blocks of flats are a big part of commuter-belt property; their frame mastic often ages block-wide.
Landlords with units on estates such as Hambrook Business Park (to the north-east of Southbourne) can bring frame, door and external mastic across several units into one programme. Buildings close to stations like Southbourne station, less than half a mile south-east of Southbourne, are often flats over shops, with frame mastic to keep sound.
Southbourne is about 4 miles east of Havant, in West Sussex. Anywhere in PO10, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. Southbourne is one of 373 places in West Sussex on our list for mastic joints. There’s a separate page for Portsmouth, about 8 miles away.
If you need mastic sealing in PO10, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. Streets here include Lodgebury Close, Manor Road and Northcote Gardens, and sites on any of them can send details for a fixed quote. Close to Southbourne, our area also takes in Woodmancote (1 mile north), Lumley (1 mile west), Westbourne (1 mile north-west), Emsworth (1 mile west) and Thorney Island (2 miles south-west). A short drive away, we cover Bognor Regis (11 miles south-east), Chichester (6 miles east), Selsey (10 miles south-east), Portfield (6 miles east), Yapton (13 miles east) and East Wittering (6 miles south).
Local landmarks in Southbourne
Around Southbourne, our work takes us to commercial buildings near The Traveller's Joy Public House, Eames Farm and Bourne Community College and the streets around them. There’s a railway station in Southbourne itself: Southbourne station. A little further out are Warblington Castle (2.5 miles west) and Emsworth Museum (1.3 miles west). The countryside around Southbourne includes Stoke Down and Brook Meadow (Emsworth).
Our process
The first thing on site is a walk round with your contact, agreeing which joints are in scope, where to start and what must stay open. Then we strip out anything that has failed, prepare every joint and seal it. For a job in Southbourne, the main thing is a clear picture of the work, so send photos of each area. You will then get a fixed price for the work.
- A building-by-building inspection lists the failed joints.
- The quote is fixed and split as suits you.
- We agree the programme and dates with you.
- Old mastic is removed and the joint faces prepared.
- New sealant goes in with backing rod and primer where needed.
- We check the finished work and confirm the guarantee.
Preparing the site
- Share your working hours and any access restrictions
- Send asbestos survey details if the building is pre-2000
- Let building users know which areas are affected
Get a fixed quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.
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Questions we are asked in Southbourne
Do you work for managing agents with blocks near Southbourne station?
Yes, and several blocks can go on one quote. Give us the building’s details and say how residents are notified, and we’ll quote and plan to suit.
Is a smaller place like Southbourne outside your area?
No. Places such as Southbourne are covered as much as the big towns. Our area covers London and the South East counties. Good photos up front let us bring everything on the first visit.
Do you seal on top of existing sealant?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
Do you guarantee the mastic work?
Our workmanship carries a 12-month guarantee and we hold public liability insurance.
Do you work to architects’ specifications?
Yes. The specification and the manufacturer’s installation guidance are what we work to, and any queries are raised before we start.
Is asbestos a concern with old mastic?
We don’t remove asbestos-containing materials. Anything suspect is tested before we carry on in line with the dutyholder’s asbestos management.
Can you reseal a whole block or estate?
Block-wide and estate programmes are common. The quote can be split however suits your budgeting.
Towns and villages near Southbourne
More services for Southbourne
Should maintenance staff do it?
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
Why deal with it now?
Adding sealant to cyclical maintenance is an easy win. Waiting until leaks appear means working under pressure with less control over timing. A failed joint lets water into a building whatever its size. Catching it early means a reseal rather than repairs.
There’s no price list, because the scope varies so much from one building to the next. For a fixed figure, call for a quote.
Why choose Mastic Doctor in Southbourne
- Workmanship guaranteed for 12 months
- Public liability insurance in place
- Failed material removed, not covered up
- One contact handling all your sites
Take a look at how commercial sealant jobs are priced and how we’re accredited.