Specialist contractors are up in arms over the decision by UK glass makers to increase their prices by up to 50% within days of one another

More than 750 people have now signed a petition on the Number 10 website calling for the government to investigate the recent increases by the dominant glass producers. This is one of the site鈥檚 10 most popular petitions.

According to Stephen Sunderland of curtain walling contractor Dortech, who set up the petition, both Pilkington and Saint-Gobain increased their prices within a few days of each another in May, by a similar magnitude and with less than one month鈥檚 notice. Others, including US firm Guardian, followed suit.

鈥淲e鈥檙e not trying to get these companies into trouble and we understand they need to put their prices up, but this is too much too soon,鈥� says Sunderland, adding that it could drive small contractors out of business.

In a letter to its customers on 20 May, Pilkington said the price of glass and the fall in demand meant manufacture and supply had become uneconomical. 鈥淎s a result we have taken the decision to increase the price of raw glass.鈥� The increases varied from 5% for its insulating glass units, to 50% for clear float glass. The rises came into effect on 8 June.

We understand they need to put their prices up, but this is too much too soon

Stephen Sunderland, Dortech

Saint-Gobain Glass UK also blamed increases on falling demand, sharp price drops between April 2008 and April 2009 and high operating costs.

The rises come about 18 months after four of the world鈥檚 biggest producers 鈥� Guardian, Pilkington the UK arm of Nippon Sheet Glass, Saint-Gobain of France and Belgium鈥檚 Glaverbel 鈥� were fined 拢348.2m for illegally co-ordinating price rises.

Saint-Gobain said that, for this rise, it had acted independently of other firms and that it opposed anti-competitive behaviour.

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