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Hi,
When a new site goes live, your rankings will drop. Especially if you have changed the content, metas and URL's. I would recommend adding some more 'Google friendly' content to the homepage and maybe to the office refurbishment page too. Agreeing with Gareth, backlinks are important too. Maybe getting some backlinks using different permutations of the words Office Refurbishment.
Good Luck with your SEO and rankings.
Page Rank is old new and its better to judge a site on its Page and Domain Authority. If you wish to see a websites Page Rank and also its MOZrank download an add on for your browser called 'Searchstatus.' It only works in Firefox and Seamonkey so make sure your using the correct browser. Having the SEOMOZ toolbar and the Searchstatus add on, you have many factors to take into consideration when judging a website.
Good luck with your ventures.