World's Oldest Architectural Practices Continuously Operating

This article lists the oldest extant architectural practices in the world. Very few architectural practices are still operating whose foundation pre-dates the beginning of the 20th C and it would not be unreasonable to conclude that any practice that was founded in the 18th or 19th C should be listed as amongst the oldest surviving architectural firms around the globe. In order to qualify for the list a practice must:
* be predominantly an architectural practice, designing and constructing buildings and like structures
* be registered in their home territory as architects or architectural designers
* be operating continuously from the date of foundation, albeit a change of names or ownership is likely over intervening centuries
* be evidenced by relevant authoritative sources

18th century

19th century

References

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Architecture lists