The expansion of Langley Green Primary School will go ahead after West Sussex County Council gave the green light to plans.
Pupils at Langley Green Primary School were left with a building site for a playground in 2009 when work stalled after the county counil ran out of funds.
The Observer and Cllr Brenda Smith (Lab, Langley Green), launched a petition to get work re-started accumulating 200 signatures.
The funding crisis was resolved by the county council and a public consultation into the third and final phase of the work, which will see the school increase in size from 45 pupils per year group to 60, was launched this year.
Cllr Peter Evans, Cabinet Member for Children – Start of Life, who has taken over the portfolio for schools from former Cabinet Member for Education, Peter Griffiths, has agreed the plans.
In a letter to the school, Cllr Evans said: “As you are aware, the majority of respondents to the informal consultation were in favour of the proposals and the then Cabinet member for Education and Schools took a decision to publish statutory notices and should no responses material or significant in number be received the proposals would proceed.
“No further representations were received during the notice period which closed on May 9. Therefore after careful consideration I have decided that the proposals should proceed.”
At the school on Thursday (May 23) pupils celebrated the news.
But the application did face some opposition after Sport England said the works would sacrifice the amount of green space the children had to play on.
This was resolved by the county council and the school will be ready for pupils next year.
The council is expanding some schools in the county to help meet the rising number of pupils.
The project is costing £3m to carry out and will see new classrooms, a play area and two forms of entry instead of 1.5. The decision means the school will have 420 places instead of 315.
It also means parents in Langley Green will no longer struggle to get their children into the school and have to enrol them elsewhere.
The expansion is due to be completed in September 2014.
Langley Green cllr Brenda Smith said: “There was a bit of a hiccup with the question over the amount of green space for the school but that has been resolved and once the second phase is finished the third phase can start. It is very good for the area and Iam absolutely thrilled. There are now two forms of entry and so parents won’t have to take their children to different schools if they can’t get them in.”