Period Feature Restoration in London Victorian and Edwardian Homes: Cornices, Fireplaces, Sash Windows, and Tiling

DECORATIVE PLASTER CORNICES AND CEILING ROSES WERE STANDARD ELEMENTS IN VICTORIAN AND EDWARDIAN LONDON RECEPTION ROOMS, BEDROOMS, AND HALLWAYS. IN WELL-MAINTAINED LONDON PERIOD PROPERTIES, ORIGINAL LIME PLASTER CORNICES MAY SURVIVE — TYPICALLY RUN IN PLACE WITH A HORSE (TEMPLATE) USING LIME PUTTY AND SAND. WHERE CORNICES HAVE BEEN PARTIALLY DAMAGED, REMOVED, OR COVERED, TWO REINSTATEMENT APPROACHES ARE AVAILABLE.

GRC / GRG REPRODUCTION CORNICE (THE MOST COMMON REINSTATEMENT METHOD IN LONDON RENOVATION): GLASS REINFORCED CONCRETE (GRC) AND GLASS REINFORCED GYPSUM (GRG) REPRODUCTION CORNICES ARE CAST IN MOULDS TAKEN FROM ORIGINAL PERIOD PROFILES OR FROM STANDARD VICTORIAN CORNICE PROFILE CATALOGUES. SPECIALIST LONDON SUPPLIERS INCLUDE STEVENSONS OF NORWICH (THE LEADING UK GRC PERIOD CORNICE SUPPLIER — STOCK OF 200+ PERIOD PROFILES, BESPOKE MOULDING FROM EXISTING SAMPLES) AND HADDONSTONE (RECONSTITUTED LIMESTONE ARCHITECTURAL MOULDINGS). GRG CORNICE INSTALLATION: SECTIONS ARE SCREW-FIXED TO CEILING JOISTS (COUNTER-SUNK FIXINGS) THROUGH THE GRG BACKING, WITH JOINTS FILLED AND SKIMMED WITH MULTI-FINISH TO BLEND. GRG CORNICES ARE LIGHTWEIGHT AND EASIER TO HANDLE THAN ORIGINAL LIME PLASTER RUN-IN-PLACE SECTIONS. COST OF GRG CORNICE SUPPLY AND FIT FOR A LONDON VICTORIAN TERRACE RECEPTION ROOM (APPROXIMATELY 4M X 5M): £1,500 TO £3,500 DEPENDING ON PROFILE COMPLEXITY.

LIME PLASTER REPAIR (FOR SURVIVING ORIGINAL CORNICES WITH LOCALISED DAMAGE): WHERE ORIGINAL LIME PLASTER CORNICES SURVIVE IN ACCEPTABLE CONDITION WITH ONLY CRACK DAMAGE, SPALLING SURFACE, OR LOCALISED MISSING SECTIONS, LIME PLASTER REPAIR IS PREFERRED OVER REPLACEMENT. ST ASTIER NHL 3.5 LIME MORTAR (OR TADELAKT FOR FINE REPAIR WORK) CAN BE USED FOR LIME CORNICE REPAIR — MIXED WITH FINE SAND AND APPLIED IN THIN COATS TO BUILD BACK THE MISSING PROFILE, EACH COAT ALLOWED TO FIRM BEFORE APPLYING THE NEXT.

ORIGINAL CAST IRON FIREPLACES AND MARBLE OR SLATE SURROUNDS WERE PRESENT IN VIRTUALLY EVERY ROOM OF A VICTORIAN LONDON TERRACE BUILT BEFORE 1900. MANY WERE REMOVED IN THE MID-20TH CENTURY — THEIR REINSTATEMENT HAS BEEN ONE OF THE MOST POPULAR PERIOD RESTORATION ACTIVITIES IN LONDON RENOVATION FOR THE LAST 20 YEARS.

SOURCING ORIGINAL CAST IRON FIREPLACES: THE UK HAS A STRONG SALVAGE AND RECLAIMED FIREPLACE MARKET FOR ORIGINAL VICTORIAN AND EDWARDIAN CAST IRON INSERTS. KEY LONDON SOURCES: LASSCO (THREE PIGEON HILL, ALDGATE) — THE PREMIER LONDON ARCHITECTURAL SALVAGE DEALER; ARCHITECTURAL FORUM (WHITECHAPEL ROAD); RETROUVIUS (HARLESDEN). ORIGINAL CAST IRON FIREPLACES RANGE FROM £150 TO £2,000+ DEPENDING ON CONDITION AND PERIOD. VICTORIAN REGISTER GRATES (ARCHED TOP, TILED CHEEKS, ASHPAN) ARE THE MOST COMMON TYPE IN LONDON TERRACES — TYPICALLY 14 INCH (355MM) TO 16 INCH (406MM) OPENING WIDTH MATCHING THE ORIGINAL FIREBOX OPENING.

REINSTALLATION OF CAST IRON FIREPLACE IN AN EXISTING CHIMNEY BREAST: WHERE THE ORIGINAL CHIMNEY BREAST SURVIVES, REINSTATEMENT OF A CAST IRON FIREPLACE REQUIRES: ASSESSMENT OF FLUE CONDITION (CHIMNEY SWEEP AND CAMERA SURVEY — £80 TO £200). FITTING OF THROAT RESTRICTOR OR CLOSURE PLATE IF FIREPLACE IS TO BE DECORATIVE ONLY (SEALS THE FLUE FROM DRAUGHTS WHILE ALLOWING VENTILATION). IF FIREPLACE IS TO BE LIVE (OPEN FIRE OR GAS FIRE INSERT), FLUE LINER MAY BE REQUIRED (FLEXELINER OR ISOKERN PUMICE FLUE LINER SYSTEM). GAS FIRE INSERT (GAS SAFE ENGINEER REQUIRED): DIMPLEX OPTI-MYST OR EVONIC FIRE EFFECT GAS OR ELECTRIC INSERT IN ORIGINAL CAST IRON SURROUND.

MARBLE SURROUNDS: ORIGINAL CARRARA MARBLE SURROUNDS ARE FREQUENTLY FOUND IN LONDON VICTORIAN TERRACES — EITHER SURVIVING IN PLACE OR AVAILABLE FROM SALVAGE DEALERS. PROFESSIONAL STONE RESTORATION (POLISHING, CHIP REPAIR WITH EPOXY STONE FILLER COLOUR-MATCHED TO MARBLE) CAN RESTORE A DAMAGED MARBLE SURROUND TO NEAR-ORIGINAL CONDITION — TYPICALLY £200 TO £500 FOR A MARBLE SURROUND RESTORATION SERVICE.

ORIGINAL TIMBER SASH WINDOWS ARE FOUND IN VIRTUALLY ALL LONDON VICTORIAN AND EDWARDIAN TERRACES. WHERE THEY HAVE NOT BEEN REPLACED WITH UPVC, THEY REPRESENT A SIGNIFICANT ARCHITECTURAL ASSET — BUT ALSO A SOURCE OF DRAUGHTS, HEAT LOSS, AND POTENTIAL MAINTENANCE ISSUES IF NOT PROPERLY MAINTAINED.

SASH WINDOW DRAUGHT-PROOFING (THE HIGHEST VALUE-FOR-MONEY PERIOD WINDOW IMPROVEMENT): DRAUGHT-PROOFING OF ORIGINAL SASH WINDOWS INVOLVES THE INSTALLATION OF PILE WEATHERSTRIPPING (NYLON PILE BRUSH SEALS) IN THE MEETING RAIL, STILES, AND SILL TO SEAL THE GAPS BETWEEN MOVING PARTS WHILE PRESERVING OPERATION. THE VENTROLLA PERIMETER SEAL SYSTEM IS THE LEADING UK SPECIALIST SASH DRAUGHT-PROOFING SYSTEM — INSTALLED BY VENTROLLA LONDON (FRANCHISED NATIONWIDE): INVOLVES ROUTING A CHANNEL INTO THE SASH FRAME COMPONENTS, INSERTING PILE BRUSH SEALS, AND POTENTIALLY RE-CORDING AND SERVICING THE SASH BALANCE MECHANISM. COST: £400 TO £800 PER WINDOW INCLUDING INSTALLATION. THERMAL IMPROVEMENT ACHIEVED: DRAUGHT-PROOFED SASH WINDOWS HAVE SIGNIFICANTLY REDUCED AIR INFILTRATION — AIR LEAKAGE (WHICH ACCOUNTS FOR UP TO 40% OF HEAT LOSS IN ORIGINAL DRAUGHTY SASH WINDOWS) IS SUBSTANTIALLY REDUCED.

SECONDARY GLAZING FOR ORIGINAL SASH WINDOWS: WHERE THERMAL PERFORMANCE IMPROVEMENT IS REQUIRED BEYOND DRAUGHT-PROOFING, SECONDARY GLAZING (FITTING A SECOND GLAZED PANEL ON THE ROOM-SIDE OF THE ORIGINAL SASH WINDOW) IS THE CORRECT APPROACH — ESPECIALLY IN CONSERVATION AREAS WHERE REPLACEMENT DOUBLE GLAZING WOULD REQUIRE LISTED BUILDING CONSENT OR CONSERVATION AREA CONSENT. SELECTAGLAZE SERIES 10 (HINGED SECONDARY GLAZED PANEL — THE MOST WIDELY SPECIFIED SECONDARY GLAZING IN LONDON PERIOD PROPERTIES) OR REDI-FIT SECONDARY GLAZING PANELS (MAGNETIC ATTACHMENT FOR EASIER REMOVAL). SECONDARY GLAZING DRAMATICALLY IMPROVES BOTH THERMAL AND ACOUSTIC PERFORMANCE — 200 TO 300% IMPROVEMENT IN SOUND ATTENUATION COMPARED WITH ORIGINAL SINGLE GLAZING (IMPORTANT IN LONDON INNER-CITY TERRACE LOCATIONS NEAR MAIN ROADS).

VICTORIAN LONDON TERRACE HALLWAYS — BOTH EXTERNAL (PATH FROM GATE TO FRONT DOOR) AND INTERNAL (ENTRANCE HALL FLOOR) — WERE TYPICALLY FINISHED IN GEOMETRIC OR ENCAUSTIC TILES IN THE LATE 19TH CENTURY. THESE TILES WERE MANUFACTURED BY COMPANIES INCLUDING MINTON, MAWS, AND CAMPBELL — AND THE PATTERNS RANGE FROM SIMPLE GEOMETRIC INTERLOCKS (TRIANGLES, OCTAGONS, SQUARES IN BLACK AND WHITE) TO MORE COMPLEX POLYCHROME ENCAUSTIC DESIGNS.

TILE IDENTIFICATION AND CONDITION ASSESSMENT: BEFORE ANY WORK, THE EXISTING TILES SHOULD BE PROPERLY ASSESSED: IDENTIFY MISSING TILES (MEASURE AND PHOTOGRAPH THE PATTERN — MANY STANDARD GEOMETRIC PATTERNS CAN BE MATCHED). CHECK FOR LOOSE TILES (TAP TEST — HOLLOW SOUND INDICATES TILE DEBONDED FROM SUBSTRATE). ASSESS SUBSTRATE CONDITION (ORIGINAL MORTAR BED ON LIME CONCRETE — LIFT LOOSE TILES AND ASSESS BELOW). ASSESS TILE CONDITION (CRACKING, CRAZING, STAINING — MOST SURFACE CONTAMINATION CAN BE CLEANED).

TILE SOURCING AND MATCHING: ORIGINAL STYLE (THE LEADING UK SUPPLIER OF VICTORIAN GEOMETRIC TILES — THEIR DEVONIA RANGE IS THE CLOSEST MATCH TO ORIGINAL MINTON ENCAUSTIC TILES IN LONDON TERRACE HALLWAYS): 100MM X 100MM SQUARE AND TRIANGULAR TILES IN BUFF, BLACK, RED, BLUE, GREEN IN COMBINATIONS MATCHING ORIGINAL LONDON VICTORIAN HALL PATTERNS. FIRED EARTH ENCAUSTIC TILES (CEMENT ENCAUSTIC — PATTERN IN MULTIPLE LAYERS OF COLOURED CEMENT): THE CLOSEST AUTHENTIC MATCH TO ORIGINAL VICTORIAN ENCAUSTIC. TOPPS TILES HERITAGE RANGE (PORCELAIN REPRODUCTION — LOWER COST, SLIGHTLY DIFFERENT FINISH FROM ORIGINAL CEMENT TILE BUT GOOD FOR SECONDARY AREAS).

TILE REINSTATEMENT: MISSING TILES SHOULD BE RE-LAID IN NHL LIME MORTAR (NOT CEMENT ADHESIVE) TO MATCH THE ORIGINAL SUBSTRATE FLEXIBILITY — CEMENT ADHESIVE ON A LIME MORTAR BED CAUSES DIFFERENTIAL MOVEMENT AND TILE CRACKING. ST ASTIER NHL 3.5 MORTAR BED (1:3 LIME:SHARP SAND MIX, 20 TO 25MM BED) IS APPROPRIATE FOR ORIGINAL VICTORIAN TILE REINSTATEMENT IN LONDON TERRACES.

LONDON VICTORIAN AND EDWARDIAN TERRACES HAVE DISTINCTIVE EXTERNAL BRICKWORK AND DECORATIVE TERRACOTTA ELEMENTS — TERRACOTTA ARCHITRAVES AROUND WINDOWS AND DOORWAYS, DECORATIVE TILE-COPING ON BAY WINDOWS, MOULDED BRICK CORBELS AT EAVES, AND DECORATIVE KEYSTONE FEATURES ABOVE WINDOWS. THE CORRECT MAINTENANCE AND RESTORATION OF THESE ELEMENTS IS CRITICAL TO BOTH THE AESTHETIC AND STRUCTURAL INTEGRITY OF THE PROPERTY.

BRICK REPOINTING: ORIGINAL VICTORIAN LONDON TERRACE BRICKWORK WAS LAID IN LIME MORTAR (NHL 2 TO NHL 3.5 — SOFT LIME MORTAR COMPATIBLE WITH THE SOFT LONDON STOCK BRICKS USED IN THE PERIOD). REPOINTING WITH MODERN CEMENT MORTAR (OPC-BASED MORTAR — SIGNIFICANTLY HARDER THAN THE ORIGINAL LIME MORTAR AND THE BRICK ITSELF) IS THE MOST COMMON AND DAMAGING ERROR IN LONDON PERIOD PROPERTY MAINTENANCE. CEMENT MORTAR IS HARDER AND LESS PERMEABLE THAN THE SURROUNDING BRICK — CAUSING THE BRICK FACE TO SPALL AS MOISTURE FORCED THROUGH THE BRICK FACE CANNOT EXIT VIA THE JOINT. ALL REPOINTING OF PRE-1920 LONDON BRICKWORK MUST USE NHL LIME MORTAR AT A MAXIMUM STRENGTH OF NHL 3.5 (FEEBLY HYDRAULIC LIME). POINTING MIX: 1 PART NHL 3.5 LIME : 2.5 TO 3 PARTS SHARP WASHED SAND — MATCHED TO ORIGINAL JOINT WIDTH (TYPICALLY 10 TO 12MM IN VICTORIAN LONDON BRICK).

TERRACOTTA RESTORATION: DECORATIVE TERRACOTTA ELEMENTS (MOULDED UNITS FROM COMPANIES SUCH AS HATHERN VALE AND DOULTON — INSTALLED 1880 TO 1914 IN LONDON EDWARDIAN COMMERCIAL AND RESIDENTIAL BUILDINGS) REQUIRE SPECIALIST RESTORATION. CRACKS IN TERRACOTTA CAN BE FILLED WITH COLOUR-MATCHED EPOXY RESIN MORTAR (REMPLEX PRODUCTS). COMPLETE TERRACOTTA UNITS CAN BE REPRODUCED BY SPECIALIST COMPANIES INCLUDING IBSTOCK BRICK HERITAGE DIVISION AND KETLEY BRICK.

THE FOLLOWING COST GUIDE COVERS THE MAIN PERIOD FEATURE RESTORATION WORKS IN LONDON VICTORIAN AND EDWARDIAN TERRACES.

GRG CORNICE SUPPLY AND FIT (PER ROOM — 4M X 5M RECEPTION ROOM): £1,500 TO £3,500. GRG CEILING ROSE (SUPPLY AND INSTALL): £300 TO £800 DEPENDING ON DIAMETER AND COMPLEXITY.

FIREPLACE REINSTATEMENT (ORIGINAL CAST IRON REGISTER GRATE + MARBLE SURROUND, SUPPLY AND FIT INCLUDING SWEEP AND THROAT RESTRICTOR): £1,200 TO £3,500 FOR DECORATIVE (NON-WORKING) INSTALLATION. LIVE OPEN FIRE REINSTATEMENT (FLUE LINER AND GAS FIRE OR OPEN GRATE): ADD £1,500 TO £3,000.

SASH WINDOW DRAUGHT-PROOFING (VENTROLLA OR SIMILAR, PER WINDOW): £400 TO £800. SECONDARY GLAZING (SELECTAGLAZE SERIES 10, PER WINDOW — SUPPLY AND INSTALL): £400 TO £900.

VICTORIAN HALLWAY TILE RESTORATION (CLEANING, RE-BEDDING LOOSE TILES, SOURCING AND REPLACING MISSING TILES — 4M² TYPICAL LONDON HALL): £800 TO £2,500 DEPENDING ON EXTENT OF MISSING TILES AND PATTERN COMPLEXITY. NEW ENCAUSTIC TILE HALLWAY (ORIGINAL STYLE DEVONIA OR SIMILAR, 4M² — SUPPLY AND INSTALL): £1,500 TO £4,000.

EXTERNAL LIME REPOINTING (PER M²): £25 TO £60. TYPICAL LONDON TERRACE FRONT ELEVATION REPOINTING (25 TO 40 M²): £1,000 TO £2,500.