Porches and Door Canopies for London Victorian Terraces: Specification, Planning, and Materials

A DOOR CANOPY — A SMALL PROJECTING ROOF OVER THE FRONT DOOR — IS THE SIMPLEST AND MOST AFFORDABLE LEVEL OF WEATHER PROTECTION FOR A LONDON VICTORIAN TERRACE FRONT DOOR. IT DOES NOT ENCLOSE THE DOORSTEP BUT PROVIDES RAIN PROTECTION ABOVE THE DOOR AND FOR THE PERSON STANDING AT THE THRESHOLD.

GRP (GLASS-REINFORCED PLASTIC) MOULDED CANOPY (THE MOST COMMON DOOR CANOPY FOR LONDON VICTORIAN TERRACES): GRP CANOPIES ARE PRODUCED IN PERIOD-SYMPATHETIC DESIGNS (HIPPED, OGEE, AND FLAT TOP PROFILES — MANY IMITATING THE ORIGINAL VICTORIAN TIMBER CANOPY MOULDINGS): CANOPIES UK GRP HIPPED CANOPY (1200MM W X 900MM PROJECTION): APPROXIMATELY £200 TO £450 SUPPLY — AVAILABLE IN WHITE, CREAM, OR BLACK. DURAPOST GRP CANOPY (1200MM W X 700MM PROJECTION — ANTHRACITE GREY): £250 TO £500 SUPPLY. INSTALLATION: 2 WALL FIXINGS (RESIN ANCHORS INTO BRICKWORK — M10 STAINLESS RESIN ANCHOR) WITH STAINLESS BRACKET ARMS. LABOUR: £80 TO £150 INSTALLATION (1 HOUR FOR 2 PERSON TEAM).

TIMBER CANOPY (THE MORE AUTHENTIC CHOICE FOR LONDON VICTORIAN TERRACE HERITAGE-SENSITIVE FRONT DOORS): A TIMBER CANOPY (JOINERY-MADE FROM PAINTED SOFTWOOD OR HARDWOOD — MERANTI OR OAK) WITH CORBEL BRACKETS (TRADITIONAL CARVED OR TURNED WOODEN BRACKETS SUPPORTING THE CANOPY FROM THE WALL) IS MORE PERIOD-SYMPATHETIC THAN GRP FOR A LONDON VICTORIAN TERRACE CONSERVATION AREA PROPERTY. SPECIFICATION: 32X220MM SOFTWOOD FASCIA BOARD (PAINTED — FARROW AND BALL RAILINGS OR BLACK BITUMEN PAINT FOR BRICKWORK ENTRANCE). LEAD COVERED FLAT TOP OR PITCHED FIBRE CEMENT SLATE (CEDRAL — MATCHING MAIN ROOF MATERIAL). CORBEL BRACKETS: CHESHIRE MOULDINGS CORBEL CM205 (PRIMED MDF — PAINTED) OR SOLID OAK CORBELS (BESPOKE JOINERY — FOR A PREMIUM FINISH). COST: £400 TO £1,200 SUPPLY AND INSTALL (TIMBER CANOPY — 1200MM W).

STEEL OR ALUMINIUM CANOPY (CONTEMPORARY DESIGN — FOR LONDON VICTORIAN TERRACES UNDERGOING CONTEMPORARY REFURBISHMENT WHERE A MODERN CANOPY AESTHETIC IS APPROPRIATE): SAIL-FORM OR MINIMAL CANOPY (E.G. TECTONICA STEEL CANOPY OR BESPOKE MILD STEEL PLATE CANOPY WITH ANTHRACITE POWDER COAT): £600 TO £2,000 SUPPLY AND INSTALL.

AN OPEN PORCH (A STRUCTURAL PROJECTING PORCH WITH SIDE WALLS AND A ROOF BUT OPEN FRONT — SIMILAR TO A SMALL LEAN-TO STRUCTURE) OR A STORM PORCH (A FULLY ENCLOSED MINI VESTIBULE — ELIMINATING DRAUGHTS AND PROVIDING A SMALL BOOT ROOM / COAT AREA) PROVIDES SIGNIFICANTLY MORE FUNCTIONALITY THAN A SIMPLE DOOR CANOPY.

OPEN BRICK PORCH (TRADITIONAL BRICK PORCH MATCHING EXISTING LONDON STOCK BRICK — THE MOST PLANNING-SYMPATHETIC OPTION FOR LONDON VICTORIAN TERRACE CONSERVATION AREAS): A BRICK PORCH (TYPICALLY 1500-1800MM WIDE X 1000-1200MM DEEP — DEPTH OF THE EXISTING DOOR STEP PLUS 300-400MM) CONSTRUCTED IN MATCHING LONDON STOCK BRICK (IBSTOCK RECLAIMED LONDON STOCK OR HAMMERSMITH YELLOW STOCK — SEE BRICK MATCHING NOTES FOR CONSERVATION AREAS) WITH A FLAT LEAD ROOF OR PITCHED PLAIN TILE ROOF MATCHING THE MAIN ROOF. TYPICAL STRUCTURAL: 102MM HALF-BRICK PORCH WALLS ON STRIP FOUNDATION (400-600MM DEEP IN LONDON CLAY), STAINLESS STEEL LINTEL ABOVE OPEN FRONT PORCH FACE (IG L1/S LINTEL), CONCRETE SLAB OR QUARRY TILE FLOOR. A PORCH OF UNDER 3M² INTERNAL AREA AND UNDER 3M HEIGHT IS EXEMPT FROM BUILDING REGULATIONS (SEE BELOW).

STORM PORCH — UPVC OR ALUMINIUM FRAMED ENCLOSURE: A STORM PORCH IS A SMALL FULLY ENCLOSED VESTIBULE (APPROX 1200MM WIDE X 900MM DEEP — TIGHT FIT BUT FUNCTIONAL) CONSTRUCTED WITH AN ALUMINIUM OR UPVC FRAMED OUTER DOOR + SIDE PANELS AND A POLYCARBONATE OR GLASS ROOF. ALUPLAST IDEAL 4000 UPVC STORM PORCH (1200W X 900D — UPVC WHITE OR LIGHT GREY ANTHRACITE): £800 TO £1,800 SUPPLY AND INSTALL. THIS TYPE OF UPVC STORM PORCH IS CONSIDERED INAPPROPRIATE IN LONDON CONSERVATION AREAS — A BRICK-AND-TIMBER STORM PORCH (MATCHING THE EXISTING PROPERTY CHARACTER) IS PREFERRED BY MOST LONDON CONSERVATION OFFICERS.

VICTORIAN CANOPIED PORCH REINSTATEMENT: THE ORIGINAL CANOPIED PORCH OF A LONDON VICTORIAN TERRACE — TYPICALLY A PAIR OF SLENDER CAST-IRON COLUMNS SUPPORTING A DECORATIVE TIMBER FASCIA WITH LEAD ROOF, OVER A TILED MOSAIC VESTIBULE FLOOR — IS A DISTINCTIVE HERITAGE ELEMENT. WHERE THE ORIGINAL PORCH HAS BEEN REMOVED, REINSTATEMENT USING HERITAGE-APPROPRIATE MATERIALS (CAST-IRON COLUMNS — PURKYNS UK OR METALCRAFT REPRODUCTION, ENCAUSTIC/GEOMETRIC TILES — ORIGINAL STYLE OR DOVER TILES, LEAD ROOF) IS A SIGNIFICANT HERITAGE IMPROVEMENT AND IS GENERALLY SUPPORTED BY LONDON CONSERVATION OFFICERS.

PORCHES AND DOOR CANOPIES ON LONDON VICTORIAN TERRACES ARE GOVERNED BY THE GPDO 2015 CLASS D (PORCHES) FOR ENCLOSED VESTIBULE-TYPE PORCHES, AND CLASS E (OUTBUILDINGS — LESS APPLICABLE TO FRONT PROJECTIONS) FOR OPEN STRUCTURES.

GPDO 2015 CLASS D (PORCHES): A PORCH (ENCLOSED PROJECTING VESTIBULE ON THE FRONT ELEVATION OF THE DWELLING) MAY BE PERMITTED DEVELOPMENT UNDER CLASS D IF: THE FLOOR AREA OF THE PORCH DOES NOT EXCEED 3M². THE PORCH IS NOT MORE THAN 3M IN HEIGHT. THE PORCH IS NO CLOSER THAN 2M TO A HIGHWAY BOUNDARY. CLASS D DOES NOT APPLY IN: CONSERVATION AREAS (WHERE AN ARTICLE 4 DIRECTION HAS REMOVED CLASS D PD RIGHTS) — IN MANY LONDON CONSERVATION AREAS, A NEW FRONT PORCH REQUIRES A HOUSEHOLDER PLANNING APPLICATION. LISTED BUILDINGS: ALL WORKS TO A LISTED LONDON VICTORIAN TERRACE (INCLUDING ADDING A NEW PORCH) REQUIRE LISTED BUILDING CONSENT IN ADDITION TO PLANNING PERMISSION.

DOOR CANOPIES AND PLANNING: A SIMPLE DOOR CANOPY THAT DOES NOT PROJECT MORE THAN 300MM FROM THE WALL FACE IS GENERALLY CONSIDERED DE MINIMIS AND NOT PLANNING RELEVANT (IT DOES NOT MATERIALLY ALTER THE EXTERNAL APPEARANCE OF THE BUILDING). A CANOPY PROJECTING MORE THAN 300MM IS TECHNICALLY A MATERIAL ALTERATION — BUT IN PRACTICE, LONDON BOROUGH PLANNING OFFICERS RARELY ENFORCE AGAINST CANOPIES THAT ARE MODEST IN SCALE AND SYMPATHETIC IN MATERIAL AND DESIGN. THE EXCEPTION: CONSERVATION AREAS — WHERE THE PLANNING AUTHORITY IS MORE LIKELY TO TAKE AN INTEREST IN PROMINENT CANOPY ADDITIONS THAT CHANGE THE CHARACTER OF THE FRONT ELEVATION.

BUILDING REGULATIONS AND PORCHES: A PORCH UNDER 3M² AND NOT STRUCTURALLY CONNECTED TO THE HEATING SYSTEM OF THE MAIN HOUSE IS EXEMPT FROM MOST BUILDING REGULATIONS. HOWEVER: ELECTRICAL INSTALLATION IN THE PORCH (LIGHT, DOORBELL, SOCKET) IS PART P NOTIFIABLE. IF THE PORCH PROVIDES THERMAL SEPARATION (I.E. A DOOR IS RETAINED BETWEEN THE PORCH AND THE MAIN HOUSE), THE ORIGINAL FRONT DOOR MAY NO LONGER NEED TO MEET PART L STANDARDS — BUT THE NEW OUTER DOOR SHOULD MEET PART L (1.4 W/M²K — DOOR LEAF U-VALUE TARGET).

THE REINSTATEMENT OF AN ORIGINAL VICTORIAN PORCH ON A LONDON TERRACE IS A SPECIALIST HERITAGE PROJECT — INVOLVING CAST-IRON COLUMNS, DECORATIVE FASCIA JOINERY, ENCAUSTIC OR GEOMETRIC TILE VESTIBULE FLOOR, AND LEAD ROOF — AND SHOULD DRAW ON HERITAGE-APPROPRIATE PRODUCT SOURCES.

CAST-IRON COLUMNS (THE DEFINING ELEMENT OF THE ORIGINAL LONDON VICTORIAN TERRACE CANOPIED PORCH): PURKYNS UK (THE UK'S LEADING MANUFACTURER OF HERITAGE CAST-IRON COLUMNS FOR VICTORIAN TERRACE PORCH REINSTATEMENT): PURKYNS SLIM COLUMN (75MM DIA, 2100MM HEIGHT — APPROPRIATE FOR STANDARD 2100MM FRONT DOOR HEIGHT): £250 TO £450 PER COLUMN SUPPLY. PAIRS REQUIRED (2 COLUMNS, ONE EACH SIDE OF THE PORCH OPENING). METALCRAFT (IRONBRIDGE) LIMITED — BESPOKE CAST-IRON COLUMN PRODUCTION TO CUSTOMER PROFILE — FOR MATCHING EXISTING ORIGINAL COLUMN PROFILES.

DECORATIVE TIMBER FASCIA AND BARGEBOARDS: THE DECORATIVE FASCIA OF A LONDON VICTORIAN TERRACE CANOPIED PORCH — TYPICALLY A DEEP FASCIA BOARD WITH APPLIED MOULDING AND DENTIL DETAIL, PAINTED — CAN BE PRODUCED BY: CHESHIRE MOULDINGS (PRIMED MDF FASCIA AND MOULDING PROFILES — AFFORDABLE, PAINTABLE). BESPOKE JOINERY (HARDWOOD — IROKO OR OAK — FOR MAXIMUM DURABILITY AND HISTORICAL ACCURACY).

ENCÁUSTIC AND GEOMETRIC VESTIBULE FLOOR TILES (THE TILED PORCH FLOOR IS ONE OF THE MOST DISTINCTIVE FEATURES OF THE ORIGINAL LONDON VICTORIAN TERRACE ENTRANCE): ORIGINAL STYLE (SURREY — THE UK BENCHMARK FOR VICTORIAN MINTON-STYLE ENCAUSTIC AND GEOMETRIC FLOOR TILES): ORIGINAL STYLE SHEFFIELD BLACK AND WHITE GEOMETRIC (100X100MM — THE CLASSIC LONDON VICTORIAN TERRACE HALLWAY AND PORCH TILE PATTERN): £60 TO £100 PER M² SUPPLY. DOVER TILES (KENT — SIMILAR TO ORIGINAL STYLE — A MORE AFFORDABLE ALTERNATIVE): £40 TO £70 PER M². LEAD ROOF FOR PORCH CANOPY: CODE 4 LEAD SHEET (1.80MM BS EN 12588) — THE CORRECT MATERIAL FOR A VICTORIAN PORCH CANOPY ROOF.

PORCH AND DOOR CANOPY COSTS IN LONDON RANGE FROM UNDER £400 FOR A SIMPLE GRP CANOPY TO OVER £10,000 FOR A FULL VICTORIAN PORCH REINSTATEMENT WITH CAST-IRON COLUMNS AND ENCAUSTIC TILE FLOOR.

GRP DOOR CANOPY (1200MM — SUPPLY AND INSTALL): £280 TO £600 SUPPLY AND INSTALL. TIMBER CANOPY WITH CORBEL BRACKETS (1200MM — SUPPLY AND INSTALL): £400 TO £1,200 SUPPLY AND INSTALL. BRICK OPEN PORCH (1500X1000MM INTERNAL — LONDON STOCK BRICK, FLAT LEAD ROOF, TILED FLOOR): GROUNDWORKS (STRIP FOUNDATION 600MM DEEP — LONDON CLAY — CONCRETE): £400 TO £800. BRICKWORK (WALLS + LINTEL — LONDON STOCK BRICK): £600 TO £1,200. FLAT LEAD ROOF (CODE 4 — 1.5M²): £300 TO £600. QUARRY TILE FLOOR (HARDWICKE IMPERIAL QUARRY TILE OR VICTORIAN GEOMETRIC): £200 TO £500. CARPENTRY (DOOR FRAME + GLAZING + FITTING): £400 TO £800. TOTAL BRICK OPEN PORCH: £1,900 TO £3,900.

VICTORIAN CANOPIED PORCH REINSTATEMENT (PAIR OF PURKYNS CAST-IRON COLUMNS + DECORATIVE TIMBER FASCIA + LEAD ROOF + ORIGINAL STYLE ENCAUSTIC VESTIBULE TILES): CAST-IRON COLUMNS (PURKYNS — PAIR): £500 TO £900. FASCIA AND MOULDINGS: £300 TO £800. LEAD ROOF (CODE 4 — 1.5M²): £300 TO £600. ENCAUSTIC TILE VESTIBULE FLOOR (2-3M² ORIGINAL STYLE): £200 TO £400 SUPPLY; £300 TO £600 FIXING. TOTAL VICTORIAN PORCH REINSTATEMENT: £1,600 TO £3,300 + GROUNDWORKS AND STRUCTURAL IF NEEDED.

A PORCH — PARTICULARLY A FULLY ENCLOSED STORM PORCH OR VESTIBULE — HAS IMPLICATIONS FOR THE ENERGY PERFORMANCE OF THE LONDON VICTORIAN TERRACE FRONT ENTRANCE, WHICH IS TYPICALLY ONE OF THE HIGHEST-INFILTRATION POINTS IN THE BUILDING ENVELOPE.

DRAUGHT REDUCTION: LONDON VICTORIAN TERRACE FRONT DOORS OFTEN ADMIT SIGNIFICANT COLD AIR INFILTRATION THROUGH: LETTERBOX SLOTS (THE MOST SIGNIFICANT DRAUGHT POINT — DRAUGHT-PROOF LETTERBOX BRUSH SEAL INSERT — STORMGUARD LETTERBOX DRAUGHT EXCLUDER): £10 TO £30. DOOR THRESHOLD (DRAUGHT STRIP BELOW DOOR — STORMGUARD RAIN DEFLECTOR DRAFT EXCLUDER OR EXITEX LOW THRESHOLD): £15 TO £50. DOOR FRAME SEALS (COMPRESSION PILE SEAL IN DOOR FRAME REBATE — REDDISEALS PILE WEATHER SEAL): £20 TO £50. AN ENCLOSED PORCH ELIMINATES THESE INFILTRATION PATHS DIRECTLY INTO THE HEATED LIVING SPACE — THE PORCH ACTS AS A THERMAL BUFFER ZONE (UNHEATED — BUT WARMER THAN EXTERNAL TEMPERATURE). ENERGY SAVING: AN ENCLOSED VESTIBULE PORCH HAS BEEN ESTIMATED TO REDUCE HEAT LOSS THROUGH THE FRONT DOOR BY 20-40% (ENERGY SAVING TRUST GUIDANCE) FOR A SINGLE-ENTRY FRONT DOOR — EQUIVALENT TO UPGRADING THE FRONT DOOR FROM A 3.0 W/M²K U-VALUE TO APPROXIMATELY 1.8-2.5 W/M²K EFFECTIVE PERFORMANCE.

PART L AND FRONT DOOR U-VALUE: PART L 2021 SPECIFIES A TARGET U-VALUE FOR REPLACEMENT EXTERNAL DOORS IN EXISTING DWELLINGS OF ≤ 1.4 W/M²K (DOOR LEAF U-VALUE — ACHIEVED BY SOLID COMPOSITE DOORS WITH A POLYURETHANE FOAM CORE). WHERE AN ENCLOSED PORCH IS ADDED: THE OUTER PORCH DOOR BECOMES THE NEW EXTERNAL DOOR FOR PART L PURPOSES — SHOULD MEET ≤ 1.4 W/M²K. THE ORIGINAL FRONT DOOR (NOW AN INTERNAL DOOR BETWEEN PORCH AND HALL) IS NO LONGER TECHNICALLY THE EXTERNAL DOOR — HOWEVER, REPLACING IT WITH A NON-PART-L-COMPLIANT DOOR IS NOT RECOMMENDED, AS THE THERMAL BUFFER BENEFIT OF THE PORCH DEPENDS ON BOTH DOORS BEING REASONABLY AIRTIGHT.