Post was baptised in Haarlem, the son of a stained-glass painter and the older brother of painter Frans Post. He is credited with the creation of the Dutch baroque style of architecture, along with his longtime collaborator Jacob van Campen. Together they designed the Mauritshuis in the Hague. According to Houbraken he was a famous architect who introduced his brother Frans to Maurice of Nassau, Prince of Orange while he was working on plans for the Mauritshuis.
According to the RKD he became a member of the Haarlem Guild of St. Luke in 1623, and became painter and architect for Stadhouder Frederik Hendrik. He was the overseer from 1640 for the new additions to Paleis Noordeinde in The Hague. From 1645 he was the architect for Frederik Hendrik for Huis ten Bosch, where he worked together with Jacob van Campen. He died in The Hague, aged 61. His son Maurits became an architect, and his son Johan Post became a painter, and his daughter married the anatomist and collector Frederik Ruysch. His granddaughter Rachel Ruysch became a famous flower painter.
(Some) buildings he designed 
- 1642 Huis Dedel, The Hague
- 1643 Huis Prinsessegracht 4 (the Hague)
- 1645-1650 Huis ten Bosch (the Hague)
- 1645-1648 Gemeenlandshuis Zwanenburg, Halfweg
- 1649-1653 Huis De Onbeschaamde, Dordrecht
- 1652-1657 Gebouw van de Staten van Holland, (the Hague)
- 1655 Johan de Witt Huis, (the Hague)
- 1657-1658 De Waag, Leiden
- 1659-1685 Stadhuis, Maastricht
- 1659-1662 Kruithuis, Delft
- 1660 Hofje van Nieuwkoop (Den Haag),
- 1661-1662 Torendeel van Lambertuskerk in Buren
- 1662-1665 Kasteel Heeze, Heeze
- 1662-1680 Hervormde Kerk, Bennebroek
- 1663 Kerk van Stompetoren
- 1668- Kaaswaag, Gouda
Huis ten Bosch (the Hague), built 1645-1650
Prinsessegracht 4 in The Hague, 1660, where the Confrerie Pictura was situated.
Dutch Reformed church of Bennebroek, which was finished posthumously in 1680.
- "The Getty: Pieter Post". Archived from the original on December 13, 2006. Retrieved October 24, 2006.
- "Post, Pieter — Encyclopædia Britannica". Retrieved October 24, 2006.
- (Dutch) Pieter Post Biography in De groote schouburgh der Nederlantsche konstschilders en schilderessen (1718) by Arnold Houbraken, courtesy of the Digital library for Dutch literature
- Pieter Post in the RKD