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Uppark House and Garden sewage system replacement project

A view across the grass of the red brick country house and separate building at Uppark House and Garden in West Sussex on a sunny day with blue skies
Uppark House in South Harting, West Sussex | © National Trust Images/Andrew Butler

Uppark House and Garden in West Sussex is making essential improvements to its 30-year-old sewage system. By connecting Uppark to the mains for the first time, the work will create a more sustainable and practical system that will help to protect the listed garden and parkland.

The work

The work will involve constructing a new pump station at Uppark and running a pipe to the mains discharge point at the nearby village of South Harting.

The pipe from Uppark will empty into the mains system at South Harting during off-peak hours only.

Connecting Uppark to the mains is a sustainable solution, creating a system that will:

  • Bring the system in line with Environment Agency regulations
  • Avoid disturbance to the Grade II* registered garden and parkland, and the South Downs National Park
  • Put an end to waste being transported off site in tankers

As part of the work, it will be necessary to close some short sections of road between Uppark and South Harting for around 3 weeks in August and for 6 to 7 weeks in September and October.

During this time, road signs will indicate the closures and provide details of alternative routes.

Timings of the work

The work to lay the sewage pipe will take place in two phases, with the closure of two sections of road:

  • Phase 1: B2146/B2141 junction to South Harting: 5 August to 23–27 August 2024
  • Phase 2: B2146/B2141 junction to Uppark: 12 September to 24–31 October 2024

This will avoid disruption during the start of the new school year and the Glorious Goodwood (30 July–3 August) and Goodwood Revival (6–8 September) festivals, including travel days before and afterwards.

We have worked with West Sussex County Council and our contractors to ensure the closures are as short as possible.

A period of flexibility has been built into the end of each phase of work to account for any potential delays.

Road closures and diversions

See maps of the Phase 1 and Phase 2 closures and alternative routes

Map of the Phase 1 road closure and diversions during the Uppark House and Garden sewage system replacement project
The Phase 1 road closure and diversions | © National Trust

Phase 1

The section of road between the B2146/B2141 junction and South Harting (marked with an arrow) will be closed. Alternative routes are marked in blue.

1 of 2

Alternative routes

During Phase 1 of the work, when the section of road between the junction of the B2146/B2141 and South Harting is closed:

  • Traffic to South Harting from south of the closure will be diverted south along the B2141 towards Chichester then north along the A286, west along the A272 (Petersfield Road) and south along the B2199 and the B2146 to South Harting

During Phase 2 of the work, when the section of road between the junction of the B2146/B2141 and the entrance to Uppark is closed:

  • Vehicles south of Uppark travelling to South Harting will be diverted south along the B1241 towards Chichester then north along the B1246 back up to South Harting
  • Traffic from South Harting will be diverted along the B1241 to Chichester where vehicles travelling towards Compton can then head north on the B1246

You can see maps showing the road closures and diversions in the gallery above. You can also access live maps at Causeway Use this link and search by area and the relevant dates:

Contact details

For issues related to the roadworks or contractors, you can contact the National Trust by emailing

For issues around road closures and traffic management, you can contact Streetworks at West Sussex County Council by phoning 01243 642105.


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