The population of Upminster increased considerably at the end of the First World War and it was decided by the Parish Council that a recreation ground was needed to provide for the leisure needs of the local residents.
In 1920, a scheme was developed by the Council for purchasing the Glebe, a large area of open ground behind the Church. The Glebe land was owned by the Church Commission and they were very keen to sell the land.
At a subsequent full Parish Council meeting a resolution was made “that the Parish Council recommend this meeting to authorise the Council to purchase the Glebe land – about 12.75 acres at a price not exceeding £3,750 for the purpose of a recreation ground."
In 1927, Upminster Sports and Social Club were negotiating with the Church Commissioners for the land and a purchase price had been fixed. Negotiations were taking place to divert the footpath across the Glebe. However, for some reason, the sale fell through and the Glebe land was again put on the market. This time, the Parish Council were determined not to lose the opportunity and they immediately entered into negotiation with the Commissioners.
On the 25th March 1929, a scheme was submitted to a full meeting of the Parish Council. The asking price was £6,000 and the terms of the proposed agreement was that £5,500 of the sum would be paid over a period of 50 years and the remainder over a period of 20 years. The repayments were estimated to be £320 per annum.
Once it had been acquired, the whole parish became very enthusiastic and the Ratepayers Association made an offer to beautify the new park. They agreed to plant a number of trees, level the meadow area and re-sow the grass where necessary. The public subscribed the generous total of £8.10.6d towards the cost of the trees etc, and they were planted at the gates and around the level meadow.
During the Second World War, Upminster Park was one of the few public spaces kept open for recreational purposes. However, as part of the air raid precautions, public underground air raid shelters were built on the North East side of the park.
Also built were two gas decontamination buildings and an Air Raid Precautions building.
There was also a British Restaurant (communal kitchens created in 1940 during the Second World War to help people who had been bombed out of their homes) built at the edge of the park.
In 1948, the underground air raid shelters were demolished and an ornamental garden built in their place. Also in the same year, two grass tennis courts were converted to hard surface and the main path from Corbets Tey Road to St Mary’s Lane was constructed.
In the 1960s, the park obtained is open frontage that makes it the park it is today, when the fence and hedge were removed from the Corbets Tey Road boundary. The path from Stewart Avenue to the Pavilion was also built.
In the 1980’s the play area moved from its old location near St Mary’s Lane to that of its present location next to the tennis courts.
Upminster Cricket Club, who’s first official match took place on Monday 30 August 1858, moved onto the site when it was still Glebe lands in the early 1920’s and they have remained ever since.
Upminster Cricket Club and Upminster Hockey Club are the constituent parts of Upminster Pavilion Club.
The Pavilion Club was formed in 1963/4 following the demolition of the former timber pavilion and the erection of the new brick built pavilion.
An extension was made to the pavilion by the club in the first half of the 2000s and later on they had two purpose built fenced cricket practice nets installed at the rear of the tennis courts.
The current friends group was formed in 2004 with help from the Parks and Open Spaces Service and have assisted greatly in renovations in the park. In 2006 extensive works were carried out in the park to improve the facilities, which included renovating and upgrading the tennis courts and children's play area. Planting also took place in the beds around the park with a variety of woody perennials being established.
In 2007, Upminster Park was awarded its first Green Flag, and alongside Bedfords Park was one of the first two parks in the borough to achieve this award.
In 2014, the park also received its first London in Bloom Silver Gilt award for the Park of the Year category.
The Friends once again contributed in 2017 when they a purchased a number of child’s trim trail equipment for the play area.