This is what HS2's latest tunnel vent shaft headhouse will look like in Little Missenden.

The headhouse, set back from the main A413, is one of four being built about vent shafts leading down to the high speed rail tunnel below.

The designs for Amersham and Chalfont St Peter have already been revealed and Little Missenden is the latest to be announced.

The headhouse will provide ventilation and emergency access to the railway line as it runs through the 10-mile long Chilterns tunnel below.

It will sit atop a 17.4 metre diameter, 30-metre deep ventilation shaft that will reach down to the twin tunnels below and will contain fans and other equipment to regulate air quality and temperature in the tunnels and remove smoke if a fire happens.

In a similar design to the other headhouses, HS2 say it will be "dark and neutral colours" to fit in with the landscape and will weather naturally over time.

As well as the headhouse, the site will also feature an autotransformer electricity station and a stair and vent building.

They say the building will be screened with planting.

The plans have been drawn up by HS2 Ltd’s main works contractor Align JV – a team made up of Bouygues Travaux Publics, Sir Robert McAlpine, and VolkerFitzpatrick.


HS2 Ltd’s senior project manager, Mark Clapp said: “Designs for the Little Missenden headhouse are the culmination of many hours’ work to develop a scheme that both serves the needs of operating HS2 and is in keeping with local design heritage.

“Our four-week engagement with the community is an opportunity for them to tell us their views of the scheme.

"As part of this programme we’ve arranged three online webinars where people will hear about how the designs were developed.”

Daniel Altier, the Align project director added that the scale of the headhouse has been "significantly" reduced.

Today’s news accompanies a four-week public engagement programme, which is seeking people’s views on aspects of the scheme including the design of the headhouse as well as plans for landscape and the area’s ecology.

You can take part here - - until November 25.

Three webinars are also being held on November 4, 9, and 12 - go to