Gardaí were called into Dublin's City Hall after demonstrators disrupted a vote on the redevelopment of O'Devaney Gardens.

City councillors were voting on a proposal to increase the amount of public housing to 80% by the purchase of additional units from the developer for a new affordable rental scheme.

However, a group calling itself Dublin South West Housing Action had organised a demonstration on the street outside and there were also people in the public gallery criticising the housing plan, which involves the development of public land by a private company.

Lord Mayor Paul McAuliffe repeatedly asked those in the public gallery to stop interrupting the meeting and applauding councillors who spoke against the plan.

Towards the end of the debate the protesters drowned out speakers by chanting "shame on you" and entered the council chamber area.

The Lord Mayor told them they were "disrupting a democratic mandate" and put the housing plan to a vote, which was passed by 39-18 votes, with one abstention.

Gardaí had arrived in the council chamber at this point and the meeting was concluded.

Members of the Dublin Agreement parties - Fianna Fáil, The Greens, Labour and the Social Democrats - negotiated with the developer Bartra and council officials to provide more public housing through a new affordable rental scheme.

Bartra has agreed to sell around 30% of the 824 planned homes at market value to an approved housing body to be used as affordable rental units.

This will be in addition to 30% going for social housing and 20% for affordable purchase. Private housing will make up just 20%.

The €300m redevelopment was originally agreed by councillors in the last council to consist of 50% private.

Councillors recently criticised the maximum price of €320,000 for affordable homes as too high and demanded an increase in the public housing element on the publicly owned land.

A majority of councillors were on the brink of rejecting the deal at the last monthly council meeting. They have to approve the transfer of title for the land involved for the deal to proceed.

Dublin City Council's assistant chief executive Brendan Kenny warned that would mean the O'Devaney tender and a similar plan for a Coolock site "going back to square one" and a five-year delay in providing a total of 1,500 homes.

However, ahead of the meeting the four Dublin Agreement parties announced a new deal that would involve an extra 30% going for affordable rental, €3.5m or half the developer's cash payment to the council being ring-fenced for the local community and the price cap for affordable purchase being reduced from €320,000 to €310,000.

During a formal announcement at the Mansion House, Mr McAuliffe said the council had inherited a bad deal from the previous Sinn Féin-led council and while this new plan was not perfect, it marked an improvement in the Dublin Agreement's aim of using public lands for public housing.

Some councillors at the monthly council meeting criticised the new plan with Sinn Féin party spokesperson Daithi Doolan saying it fails to deliver affordable housing or community gain and the party is now calling on the council to take over the development.

It was also opposed by other left wing parties and independents who criticised the fact that the developer was being paid market prices for the additional public housing.

Fine Gael councillors also opposed the new scheme.

Mr Kenny said it would be "challenging" to provide an affordable rental scheme on the site.