A local authority faces the possibility of a judicial review just three months ahead of its plans to introduce Newham-style blanket licensing of all rental properties.

Landlords and letting agents in Croydon are currently being warned they must get their properties licensed or face possible legal action, following a decision made in March by Croydon Council to roll out borough-wide selective licensing.

However, that decision is now being challenged by a group of landlords, on the basis of allegedly poor consultation.

A judge is expected to rule within two weeks whether there are grounds for a judicial review of the scheme, expected to cover 30,000 private rented homes from October 1 onwards.

The new selective licensing scheme, known locally as the ‘Croydon Private Rented Property Licence’, will extend licensing to almost every house or flat let out to an individual, couple or single household anywhere in the borough. There are very few statutory exemptions.

The council says it will implement the new scheme to tackle significant and persistent problems with anti-social behaviour and to address poor property management. Before implementing the scheme, the council conducted a public consultation exercise during which 70% of private tenants and local residents said they supported the scheme whilst most landlords and letting agents who replied were opposed to the idea.

Landlords are being encouraged to apply early and benefit from a discounted fee of £350 per property from yesterday to the end of September.

After that, the fee will increase to £750 per property, which will become the highest selective licensing fee in London.

Assuming about half of properties apply early and benefit from the discounted fee rate, the scheme could generate over £15m in fees for Croydon Council, equating to £3ma year over the next five years. All the money raised will need to be reinvested , as councils are not allowed to profit from licensing schemes.

Richard Tacagni, managing director at consultancy firm London Property Licensing, said: “It is really important that the council widely publicise this new scheme to raise awareness amongst the many landlords who live outside the borough – either elsewhere in London, the country or abroad.

“I have recently spoken to several landlords who had no knowledge that their single-family rented properties in Croydon will soon need a licence.

“With different licensing criteria being adopted by each London Borough, this is becoming a major headache for landlords and causing a lot of confusion. That is why I set up the London Property Licensing website to help landlords identify what licensing requirements apply to their properties.”

A spokesperson for Croydon Council said: “We are confident that our landlord licensing scheme is robust, lawful and will raise housing standards across the borough, and we’ll continue preparing to launch this scheme from October 1.”