Pentagon installations is a building company specialising in glazing but covering a broad range of commercial buildings and residential property projects. Founded in 1996 we have gained an excellent reputation across London and the southern counties. Our creative, advisory expertise allows us to assist in your creative design decisions right from the very beginning as well as managing the building project and construction to ensure the high quality finish you expect.

We work in partnership with our clients, architects, planners and other specialists to create projects that are well planned and executed successfully. Our building teams are respectful, trustworthy, highly professional and committed to delivering high standards. If you are considering a residential or commercial project, including extensions, developments or full refurbishment – wherever you are in the process – we would be delighted to hear from you. Call us today on 01243 811277.



  • Kitchen extensions
  • Glass skylights
  • Garage conversions
  • Side return extension
  • Loft conversions
  • Commercial Glazing
  • Brick built extensions
  • Garage conversions
  • Conservatory roofing
  • Energy saving glass
  • Bi Fold doors
  • Self cleaning glass
  • Contemporary extensions
  • Contemporary glazing
  • Modern conservatories
  • Folding glass doors
  • Aluminium glazing
  • Updating a conservatory
  • Extending a kitchen
  • Glass Rooms
  • Orangery design
  • Hardwood timber Bi Folds
  • Modern office glazing
  • Reclaim Your Space!
We cover the south cost to London. Many projects undertaken in Portsmouth, Brighton, Chichester and Southampton.  


It means a lot to us to have satisfied customers...
I would absolutely recommend our builders. They are a really nice bunch of lads headed up by Brett Munden who is the most honest builder I have come across and we have met many over the years. The quality of work done by his team is top quality and excels value for money. The trades he brings are all of the same level whether it is electrician, plumber, tiler or bricklayer. They were all very clean and tidy and to save money bringing in Porta loos etc. we allowed them to use our facilities which they respected at all times and always left them as they found them. They are a pleasure to have around and great fun too as they are all young with families themselves and all work hard. Brett is extremely well organised and his quote was the best of all of the Haslemere lot who in my view were expensive. We will be using him again for our new house later this year and trust him so much we will not even be getting another quote. He made our neighbours' Andy and Liz’s bespoke front door and I suspect they will get Pentagon Installations to do their extension too! I cannot recommend him more highly and the Estate Agents who looked at our house were so impressed they asked for his cards and have recommended him to others. From that he has won a couple of contracts in Haslemere. Brett produced a really detailed excel spreadsheet schedule of works and worked to time and budget. The only difference was the additions/changes we put in and where there was unforeseen work we always knew and agreed with him. At the end Pentagon Installations gave us money back for things they did not need to do, or were able to do in a different way cheaper.
Mr & Mrs Scorer, Haslemere
“Our new kitchen extension has been a godsend. From design through to completion Pentagon gave us great confidence with their professionalism and craftmanship”
Mr P Wall - Fareham, Hampshire
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