Colombo National Museum last visit did not allow camera allows mobile phones conditions change

All 7 days Except public holidays such as Full Moon Poya days, Sinhala & Tamil New Year Day, Thai Pongal, Ramazan, Christmas etc.

Yes, the building was constructed with bricks and masonary. If you wand further details visit, museum.gov.lk See bellow is a General Description . The Colombo Museum as it was called at the beginning was established on 1st January 1877. It founder was Sir William Henry Gregory, the British Governor of Ceylon (Sri Lanka) at the time. The Royal Asiatic Society (CB) was instrumental in bringing to the notice of Gregory on his appointment as Governor in 1872 the need for a public museum with much difficulty the approval of the legislative council was obtained within a year. The Architect of the Public Works Department, J.G. Smither was able to prepare the plans for new structure on Italian architectural style. The construction was completed in 1876 and the Museum commenced it functions in the following year.

The entrance fee in the museum is 600 srilanka rupees for the foreigners. For srilankans it's very cheap I think 100 only. The rate for camera is 250 separate.

Unfortunately YES

It is opened on seven days of the week except declared special holidays by the government (eg: Poya Day = Full moon day)

The Colombo museum as it was called at the beginning was established on 1 January 1877. It founder was Sir William Henry Gregory the British Governor of Ceylon (Sri Lanka) at the time. The Royal Asiatic Society (CB) was instrumental in bringing to the notice of Gregory on his appointment as Governor in 1872 the need for a public Museum with much difficulty the approval of the legislative council was obtained within a year. The Architect of the Public Works Department, J. G. Smither was able to prepare the plans for new structure on Italian Architectural style. The construction was completed in 1876 and the Museum commenced it functions in the following year. The construction of the Museum was carried out by Arasi Marikar Wapchie Marikar (born 1829, died 1925, aka Wapchi Marikar Bass, who was descended from the Sheiq Fareed family who arrived in Ceylon in 1060 AD), paternal grandfather of Sir Razik Fareed, Kt., JPUM, OBE, MP (born, 29 December 1893, died 23 August 1984). Wapchi Marikar Bass was the builder of the General Post Office in Colombo, Colombo Customs, Old Town Hall in Pettah, Galle Face Hotel, Victoria Arcade, Finlay Moir building, the Clock Tower, Batternburg Battery and many other buildings that are still standing today (2011). The Old Town Hall in Pettah, which is now a busy market, was built on a contract for the sum of 689 Sterling Pounds. Heiyantuduwa Raja (elephant) Skeleton at National Museum of Colombo, Sri Lanka In January 1877, the completed building of the Colombo Museum was declared open by Governor Gregory, in the presence of a large crowd, amongst which there were many Muslims present. At the end of the ceremony, the governor asked Arasi Marikar Wapchi Marikar what honour he wished to have for his dedication. He asked the same question of the carpenter who assisted Wapchi Marikar with the woodwork of the Museum, who requested and was awarded a local rank. Wapchi Marikar requested that the museum be closed on Fridays, the Muslim sabbath; this request was granted and maintained, although the Museum later much opened on all days except public holidays[2] When the throne of the last Kandyan King was to be exhibited at the Museum, the then Prime Minister, Mr. D.S.Senanayake, obtained the consent of Sir Razik Fareed, Wapchi Marikar’s grandson, to keep the Museum open on the intervening Fridays only. During the period between 1877 and 1999, the authorities of the museum took various steps to display the cultural and natural heritage of the country for this purpose. Several other wings were added from time to time under the direction of Dr. Arthur Willey and Dr. Joseph Pearson new structures were built during the period of Dr. P. E. P. Deraniyagala, Dr. P. H. D. H. de Silva and Sirinimal Lakdusinghe. One of the natural history museum, and yet another consists of the auditorium. These buildings would facilitate the extension of the library ethnological and Anthropological studies, etc.

This was built on the 01st of January, 1877. The founder is Sir William Henry Gregory. The actual building was built for a museum of course.