Retrofitting Historic Buildings - Westminster City Council

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Disadvantages: It can be more expensive than simplerefurbishment measures, and care must be taken wheninstalling not to damage existing window frames, or existingshutters. Removable secondary glazing which is taken down insummer will require careful storage, and care taken to select asystem which enables access to the original windows forcleaning and maintenance.Risks: As with other measures that reduce air flow, specialistadvice will be needed to deal with ventilation and condensation.Measures which reduce ventilation may not be appropriate inkitchens and bathrooms. Although the secondary glazing unitmay be well sealed, the original windows should not be sealed,ensuring that there is still ventilation, of the cavity to the outside,preventing moisture and condensation build up within the cavitybetween the original window and the secondary glazed unit.When to do this: This works as a standalone measure, but forthe best results consider doing this at the same time asrefurbishing existing timber windows.Costs: Costs will vary greatly depending on the type of system,whether it is ‘seasonal’ (i.e. a lightweight system, removable insummer) or fixed and double glazed, the degree to which it canbe opened, and ‘matches’ existing windowSecondaryGlazingListedbuilding 31UnitCost(lower)Cost(Upper)Cost(average)Per £100 £250 £175 -1.36m 2windowSubsidies(refer toESTwebsite forlatest info 30For further information see:• Factsheet produced by English Heritage on secondaryglazing:http://www.climatechangeandyourhome.org.uk/live/content_pdfs/891.pdf• ‘An Introduction to Low Carbon Domestic Refurbishment’CPA (2010)http://www.constructionproducts.org.uk/publications/dbfiles/Domestic%20Refurbishment%20Revised11010%20(low%20res).pdfCase Study88 Lothrup Street has includedsecondary glazing in itsstrategy for whole houserefurbishment under theRetrofit for the FutureProgramme, funded by theTechnology Strategy Board.The house is located in aConservation Area, and thewindows to the front wererefurbished with double glazedsecondary glazing installedbehind. The window also hadthermal blinds installed.32
Double (or triple) glazingDoesBuildingRegs. apply?Yes -No need tonotify ifinstaller ispart of acompetentpersonscheme, e.g.FENSAapprovedIs this work a requirementtriggered by Part L1B?http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADL1B_2010.pdfPart L1B requires improvements to‘controlled elements’ whichincludes windows (where the wholeof the window unit including theframe is being replaced) to meetspecified U-values.Note: exemptions for buildingswhich are:1. listed2. in conservation areas3. of architectural and historicalinterest,4. of traditional construction.These buildings should ‘improveenergy efficiency as far as isreasonably practicable. The workshould not prejudice the characterof the host building or increase therisk of deterioration of the buildingfabric or fittings’. English Heritagehave produced guidance onapplying part L to historicMedium Medium–Advicemay be neededon ventilationandcondensationPermissions and consents...Disruption Risks Unlisted within a Listed buildingconservation areaPlanningpermission will berequired for flatswhere newwindows materiallyaffect the externalappearance of thebuilding, e.g.where the framesize changes;openingmechanismschange ormaterials for thewindow change.For adwellinghouse(not flats) this ispermitteddevelopment butis subject tocertainconditions. 33Listed Buildingconsent will berequired, and thiswill generally notbe consideredacceptable,although there aresome instanceswhere it will beconsideredpossible, such aswhere installed toa modernextension or laterpart of thebuilding.Unlisted outside aconservation areaPlanningpermission will berequired for flatswhere newwindows materiallyaffect the externalappearance of thebuilding, e.g. wherethe frame sizechanges; openingmechanismschange ormaterials for thewindow changes.For adwellinghouse (notflats) this ispermitteddevelopmentsubject to certainconditions. 34Dashed line indicates difference of approach for flats and houses33
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 14 and 15: MeasuresThis section outlines measu
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 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

Retrofitting Historic Buildings - Westminster City Council

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