| 1800 | Ramsey | Light established on Larboard Hand in entering 35 ft above HW, 29ft from lantern to ground |
| 1801 | Douglas | Red Pier completed cost £25,000 |
| 1801 | | Mr Stevenson made his tour of English Lighthouses |
| 1801 | Peel | A small piece added to Peel Pier |
| 1802 | | Mr Stevenson’s Report stresses need for Lighthouse on Calf of Man |
| 1807 | Douglas | 1807-1881 Encroachment of beach between Red Pier and Pollock Rocks. (Scott – Receiver General) |
| 1809 | Peel | Pier carried away |
| 1810 | | Repairing and lengthening of Pier at Peel |
| 1811 | | Red light on east side of entrance Peel harbour 21 ft above HW visibility 8 miles |
| 1811 | Douglas | Tower erected on Douglas Head by British Government |
| 1811 | Langness | Tower erected by British Government |
| 1812 | Port St Mary | Inner Pier built |
| 1812 | Port St Mary | Pier Head light established 25ft above HW 17ft lantern to ground visibility 9 miles |
| 1814 | Ramsey | Sir John Rennie visits harbour |
| 1815 | | (June) Northern Lighthouse Board authorised by Act of Parliament to erect lighthouses in the Isle of Man and levy dues. |
| 1815 | | (August) Committee of Northern Lighthouse Board visit Calf of Man to fix position of lights |
| 1815-16 | Peel | Pier straightened |
| 1818 | Point of Ayre | Lighthouse established 01/02/1818. 103ft above HW visibility 15 miles |
| 1818 | Calf of Man | Lighthouse established 01/02/1818 |
| 1819 | Douglas | First regular steamer service to Douglas |
| 1823 | Peel | “White Wall” built at Peel to divert river. |
| 1826 | Douglas | Sir Wm Hillary’s Breakwater Scheme placed before Admiralty. |
| 1827 | Port St Mary | Crane erected to ship limestone |
| 1829 | Douglas | Lake enclosed by walling (by Major Taubman) (see 1768) |
| 1829 | Peel | Jetty built £700 |
| 1831 | | Drawing of Manx Light by Flower |
| 1832 | Douglas | Tower of Refuge erected |
| 1832-33 | Douglas | Douglas Head Lighthouse erected by IOMHC under 11 Geo 2 c 52 104 ft above HW visibility 15 miles |
| 1835 | Douglas | Capt Denham RN.FRS. Breakwater Scheme |
| 1835 | Douglas | Sir John Rennie Breakwater Scheme |
| 1835 | Douglas | Fort Anne Jetty built. Cost £2,900 |
| 1841 | | Timperley’s Survey of Manx Harbours |
| 1842-3 | Peel | Encroachment (At present Railway Station) by Caeasar Corris 400 ft x 120 ft |
| 1842 | Peel | Tongue of Quay widened, £600 |
| 1842 | Derbyhaven | Breakwater commenced March, completed October 1843. Cost £3,524 |
| 1842 | Ramsey | Northern Pier commenced March. Completed November 1843 (November) Cost £2,570 |
| 1844 | | Harbour dues abolished |
| 1844 | Castletown | Pier commenced. Completed late 1845 Cost £2,685 |
