Retrofitting Historic Buildings - Westminster City Council

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MeasuresThis section outlines measures which might be appropriate to retrofit in <strong>Westminster</strong>. It excludesmeasures which might be appropriate in other locations but which are not considered generally tobe suitable in <strong>Westminster</strong> such as biomass heating, which has considerable negative air qualityimpacts and is not generally considered to be sustainable unless you have a nearby source of fuel.For each measure a table summarises the different consents that might be needed in terms of thethree alternative heritage building scenarios.These have been colour coded as below, with the lightest colour reflecting those measures whichmay be permitted development, or for which permission is unlikely to be needed, and the darkestcolour indicating that permission would need to be sought and the measure is unlikely to beacceptable.123Measure unlikely to require permission or consent; may be permitted development insome cases.Measure likely to require planning permission or consent and may be acceptable subjectto detailed design.Measure unlikely to be considered acceptable in most cases.Dotted outline indicates a different approach depending on whether the building is a flator a house, see summary chart at pages 58-59.14
Loft and roof insulationDoesBuildingRegs applyNot forsimpleinstallationof loftinsulation inan existingloft, butwhererenovatinga thermalelement,e.g.replacing aroof, loftinsulationwill berequired.Does Part L1B require this?http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADL1B_2010.pdfPart L1B requires improvementsto the whole of thermal elements,such as roofs where renovationwork is taking place on morethan 50% of the surface of thatelement.Note: buildings which are:1. listed2. in conservation areas3. of architectural andhistorical interest, referredto in a local authoritydevelopment plan4. of traditional construction.will not be required to undertakeworks which would ‘prejudice theappearance and character of thebuilding’. It is not likely to be thecase here. English Heritagehave produced guidance onapplying part L to historicbuildings 11Permissions and consents...Disruption Risks Unlisted within a Listed buildingconservation areaLowLow risks if installingbetween existingjoists, but ensure anair gap aroundedges of loft toavoid damp andallow air to circulate.Installation ofinsulation at rafterlevel has more risksassociated.Permission notrequired as longas it doesn’t alterexternalappearance ofroofPermission/consent notnormallyrequired as longas it doesn’t alterexternalappearance ofroof or involvemodification ofroof structure.Unlisted outside aconservation areaPermission notrequired as long asit doesn’t alterexternal appearanceof roof15
Page 1 and 2: Retrofitting Historic Buildingsfor
Page 3 and 4: ContentsIntroduction 4Limitations o
Page 5 and 6: This guidance will be of most use t
Page 8: Article 4 DirectionsFor some buildi
Page 12 and 13: competent person’ scheme exists.
Page 16 and 17: Installing insulation in existing r
Page 18 and 19: Floor insulation (suspended timber
Page 20 and 21: For further information see:• Fac
Page 22 and 23: Solid wall insulation can be a way
Page 24 and 25: For further information see:• Fac
Page 26 and 27: Solid wall insulation can be a way
Page 30 and 31: Advantages: This can improve the th
Page 32 and 33: Disadvantages: It can be more expen
Page 34 and 35: A significant amount of heat is los
Page 36 and 37: Boiler upgradeDoesBuildingRegsapply
Page 38 and 39: Heating controlsDoesBuildingRegs ap
Page 40 and 41: Micro Combined Heat and Power (CHP)
Page 42 and 43: Ground source heat pumpsDoesBuildin
Page 44 and 45: Air source heat pumpsDoesBuildingRe
Page 46 and 47: For further information see:• ‘
Page 48 and 49: Solar PV panels convertenergy from
Page 50 and 51: Solar thermal panelsDoes BuildingRe
Page 52 and 53: Living roofDoesBuildingRegsapply?Is
Page 54 and 55: Case Study: 15 Passmore Street, SW1
Page 56 and 57: Case Study: The Flagship HomeArchit
Page 58 and 59: SummaryMeasureUnlisted, within acon
Page 60 and 61: Westminster’s Planning PolicyThis
Page 62 and 63: Notes and References1 Westminster H
Page 64 and 65:
35 Town and Country Planning (Gener
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Retrofitting Historic Buildings - Westminster City Council

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