Bottom half of roof light being secured inside Great Room roof void. Original roof structure with beams and joists surrounding new roof light

Lower half of roof light being lowered into position

Photographer Richard Olivier

Photographer Denzil McNeelance

Photographer Denzil McNeelance

Third painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Sixth painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Sixth painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Sixth painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Damage to the top of 'Bolton' column on Great Room landing, caused by glass doors swinging back onto column

Benjamin Franklin room, light fitting recessed under Great Room floor

Floor structure

Floor structure

Floor structure

Original floor joists

Original floor joists

Original fireplace on western wall and original floor joists

Fireplace on landing outside Great Room with RSA fire grills

Shows dirt encrusted column above 8 John Adam Street