"6.7 Proposals for development should follow these principles: • Nos 48-58 and No 66 should be carefully repaired and refurbished, and if appropriately designed a fourth (mansard or hipped roof) storey is possible; • Nos 60, 62 and 64 should be rebuilt to match the buildings which existed prior to fire damage and demolition; • Nos 66a-84 should be carefully repaired and refurbished and if necessary rebuilt with an appropriate façade, and potentially with the addition of a fourth (mansard roof) storey; • Potential for rear additions/extensions to the properties subject to appropriate scale and design; • The repair and reinstatement of the missing features of the shopfronts to restore the look of the original parade of shops. This will bring the front elevation of the Terrace back to its original appearance thereby re-instating the cohesive and interesting townscape character which forms part of the basis of the Conservation Area designation."
"1 Existing buildings and open spaces of historic or architectural merit must be conserved and enhanced and new buildings are encouraged to be sympathetic to this context whilst encouraging high quality, contemporary design responses that achieve optimal regeneration impact. 2 The historic fabric of the town centre in terms of the architectural, townscape and landscape features will be protected and enhanced in relation to: d) the conservation-led regeneration of the terrace extending from 46 to 86a Dalston Lane."
"In addition to the above visual survey, brickwork testing was undertaken by Sandberg in order to establish the quality and strength of the existing masonry [referenced in report]. Brickwork sampling and testing was undertaken only on the externally accessible brickwork. The external facades were not accessible and thus no brick work was tested in those areas. The Sandberg brick testing concluded that the internal masonry consisted of second or third-class bricks set in generally non-hydraulic lime and sand mortar. It concluded that the masonry would not be suitable for a change of use/layout whereby the masonry would be subjected to significant changes in load path, significant concentrated loads or the introduction of flexural stresses due to inadequate strength of the non-hydraulic lime mortar." 15. There is reference to the test concluding that the facade bricks were of high water absorption and relatively low strength. It went on: "
"The areas of brickwork previously rendered or painted could not withstand the required cleaning processes without significant loss of material, both from the brick faces themselves and from the mortar which would damage the facade masonry beyond repair and re-use."
"The above issue would make it impossible to safely manage the retention of the facade during the redevelopment of the site. There would be a high risk of collapse during installation of any temporary works. If retention was achieved it would be impossible to adequately restrain so to tie the remaining brickwork facade into a new structure behind due to the degree of existing bowing, dishing and out of plumb that exists in the walls. Due to the extent of defects in the inherent structural instability of the existing facades as stated above, it would also be impossible to expect the facade to support any additional loading that may be imposed by the proposed additional floor at mansard level."
"With regard to the brickwork strength argument, this is flawed [that is to say the flaw relating to the Dann Report]. It is not appropriate to judge buildings of this age and type as if they are modern construction. The bricks and mortar in the facades of these buildings are no in any way unusually weak per se. They are London stock bricks made in lime mortar as used all over Hackney and elsewhere in London in Victorian times. Buildings constructed of these materials have stood the test of time. And provided they are well maintained and carefully considered in any redevelopment proposals or proposals to alter them they can be expected to last indefinitely. Dalston Lane's problem with the facade is not to do with the strength of the brickwork. They have been mainly a failure to maintain the buildings properly linked to some faults in the original construction."
"Our original report stated that if the facade was retained even in part there would be the need for ..... straight ties on new columns/floor positions which would lead to unacceptably high localised fixing forces which the brickwork would be unable to resist. This view is strengthened by our experience on site."
"The loss of the previously intended retention of the areas of the front facade would be harmful to a conservation area. This is regrettable but must be viewed in planning context."
"Where a development proposal will lead to less than substantial harm to the significance of a designated heritage asset this harm should be weighed against the public benefits in the proposal, including securing its optimum viable use (NPPF paragraph 134)."
"6.8.1 Comments with regard to potential for alternative proposals which retain more of the original building fabric are noted. It is accepted that alternative proposals which retain a larger proportion of building fabric towards the rear of the site may also be able to retain a greater proportion of the front building facade. For example, it may be technically possible to repair the group of buildings Nos 48 to 58 which are in better condition. Retention of the rear parts of these buildings would allow for retention of their front facades through comparison with the total demolition now proposed. 6.8.2 However the proposed demolition would allow for the immediate implementation of the previously approved development which would safeguard the contribution that the site would make to the townscape and conservation area albeit in a slightly diminished manner in comparison to the previously approved facade retention proposals. The viability or likelihood of any alternative proposals being implemented involving the retention of a greater proportion of building fabric is unknown and it may be possible that no such scheme could come forward, resulting in further deterioration and potential total loss of the existing buildings without any (Inaudible). As such, the rebuilding of the retained facade would help to safeguard the contribution from the site towards the townscaping conservation area."
"134 Where a development proposal will lead to less than substantial harm to the significance of a designated heritage asset, this harm should be weighed against the public benefits of the proposal, including securing its optimum viable use."