Seven of the nine £600,000-£800,000 houses in Nicholls's mews are now freehold, but they all come under Grosvenor's Belgravia estate management scheme, which entitles Grosvenor to charge houseowners for a mews warden along with street cleaning and lighting. Nicholls currently pays £180 a year, but if the sum goes up he can't, as a leaseholder could, take Grosvenor to a leasehold valuation tribunal (LVT) to challenge the increase. If he doesn't pay within 21 days, Grosvenor is entitled to put a charge on his property. When he built a roof extension, as well as obtaining local authority planning permission and paying his own architect and structural engineer, he had to submit his plans to Grosvenor and add to his costs by employing a Grosvenor surveyor. Nicholls is outraged: "You pay £22,000 to enfranchise your house and find you've bought nothing."