The village is four miles (6.5 km) southeast of
St Ives and six miles (10 km) northeast of
Penzance. The parish shares boundaries with
Ludgvan in the west,
Hayle in the north, and
St Hilary in the south. The old coaching road once led through the village, before the building of the causeway in 1825 along the edge of the Hayle
Estuary. Prior to 1825 anyone wanting to go from Hayle to St Ives or Penzance had to cross the sands of the Hayle Estuary or make a significant detour crossing the River Hayle at the ancient St Erth Bridge. The Star Inn, in St Erth village centre, is a
Grade II listed building coaching inn dating from the fourteenth/fifteenth centuries. It was along this route that tin was carried upcountry from the
stannaries of
Penwith. Guides took travellers across the sands, but, even with guides, it was sometimes a perilous journey and the shifting sand and racing tide claimed several lives. Because of this major obstacle to trade, a turnpike trust was formed, with Henry Harvey a trustee, to build the causeway which now takes the road below the plantation west to the Old Quay House. Costing £5000 in 1825, the investors charged a toll to use the causeway to recover their costs. St Erth was the site of a large creamery operated by
United Dairies: this was responsible for processing a large quantity of milk produced in Penwith.
Manor houses Trewinnard Manor is an early 18th-century house built on a different site from its medieval predecessor by the Hawkins family.
Trelissick Manor is a medieval house remodelled in 1688 for the Jacobite
James Paynter, again remodelled in the 18th century and extended in the 19th century. Tredrea Manor is a 17th-century house but it was largely rebuilt c. 1856. The front is of five bays built in ashlar.
St Erth Sand Pits St Erth Sand Pits were worked for
Pliocene sands and clays. The clay was used for fixing candles to miners' helmets and also for
puddling the
dry dock at
Penzance. Later it was used by
Bernard Leach at his
pottery in
St Ives. The clay was the source of significant
fossil finds and in 1886 the
Royal Society obtained a government grant to search the shell-beds. In 1962 the pits were designated a
Site of Special Scientific Interest (SSSI). However, the main use of the
sand in this location was for the
metal foundries throughout Cornwall, but especially for
Harvey's of nearby
Hayle, and beyond. The sand grains are found coated with a thin film of clay. With gentle pressure and the correct percentage of water the sand grains will bind together and can be used for making a
sand mould into which molten metals can be poured to make engineering castings. One of the disused pits is a geological nature reserve owned by
Cornwall Wildlife Trust and part of St. Erth Sand Pits SSSI is owned by the
Diocese of Truro (via their Diocesan Board of Finance). Another good source of clay for fixing candles to miners' helmets was on
St Agnes Beacon. ==Parish church==