Renovating a Victorian Terraced House in London: Order of Works, Timeline, and Budget Guide

The pre-construction phase is the most important investment of time and money you will make in a London terrace renovation. Decisions made in this phase — about the scope, the design, the specification, and the contractor — determine the quality, timeline, and cost of everything that follows.

Structural survey: Before purchasing and certainly before designing any significant renovation, commission a RICS Level 3 Building Survey (formerly a Full Structural Survey). A Level 3 survey investigates accessible areas of the building, identifies defects, and recommends further investigation where warranted. The surveyor will flag: evidence of structural movement; condition of the roof; evidence of damp and rising damp; condition of chimneys and chimney breasts; state of the electrical and plumbing services; and any visible asbestos-containing materials.

Asbestos refurbishment survey: Before works begin, commission an asbestos refurbishment and demolition survey of the areas to be disturbed. The surveyor will sample suspected ACMs (Artex, floor tiles, pipe lagging) and have them laboratory-tested. The results will inform whether asbestos management or removal is required before the main renovation commences.

CCTV drainage survey: A CCTV drainage survey (£150–£400) provides a video record of the condition of the drain runs beneath the property. This is essential in a London terrace where the Victorian drainage system may be partially collapsed, blocked, or in a condition that requires replacement before new drainage connections (for an extended kitchen or basement) can be made. Discovering drainage defects during the renovation rather than before it typically doubles the cost of fixing them.

Architectural design and planning: Engage an architect or building designer to develop the layout and design intent before approaching contractors for prices. A well-developed design — with accurate floor plans, sections, and a clear specification intent — allows contractors to provide meaningful prices. Vague or incomplete design documents result in prices that are not comparable and that leave significant scope for variation claims during the works.

Building Regulations application: Most renovation works (structural alterations, loft conversion, extension, rewiring, new drainage, plumbing) require Building Regulations approval. Submit a Full Plans application (rather than a Building Notice) for complex renovations — this requires more upfront documentation but produces a clear approved set of drawings that provides certainty for the contractor and inspector.

Contractor selection and tendering: Obtain at least three competitive prices from experienced London terrace renovation contractors. Appoint on the basis of price and programme, references, and the quality of their pre-contract communication. The contract should clearly specify: the scope of works; the contract sum; the payment schedule; the programme; how variations will be instructed and priced; and the dispute resolution mechanism.

Once pre-construction is complete and the contractor is appointed, the first stage on site is enabling works and demolition.

Typical enabling works and demolition activities in a London terrace renovation:

Soft strip: Remove all existing finishes — floor coverings, kitchen units, bathroom sanitaryware, internal doors, architraves, skirting boards. This is the most labour-intensive phase of demolition and typically takes 3–7 days.

Asbestos management and removal: If the asbestos survey has identified ACMs in areas to be disturbed, these must be removed or encapsulated by an appropriately qualified contractor before any other work in the affected areas can proceed. This step is frequently under-planned and causes delays when it is not addressed early in the programme.

Chimney breast removal (where planned): Chimney breast removals are a standard part of many London terrace renovations — removing the chimney breast in the front or rear reception room creates a flat wall and increases usable floor space. Chimney breast removal requires: RIBA/CIBSE-compliant structural design with an appropriate steel or concrete beam; temporary propping while the opening is formed; building control inspection and sign-off; and a party wall notice to the adjoining owners if the chimney stack on the party wall is being removed or altered.

Removal of non-original internal walls and partitions: Where the brief involves opening up the ground floor into an open-plan kitchen-diner-living space, the non-structural internal partitions are removed. Where loadbearing walls are removed, this is a structural alteration requiring a steel beam installation (see Stage 2) and must be preceded by temporary propping.

Drainage preparation: If the project involves new drainage connections (for a new bathroom, a kitchen extension, or a relocated utility room), the drains must be exposed and assessed before new drainage runs are installed. Old ceramic drainage channels and cast-iron pipes must be replaced with UPVC where they are in contact with new construction.

Structural works follow closely behind or concurrently with enabling works. This stage typically involves the most technically complex and highest-risk activities in the renovation:

Steel beam installations: Every load-bearing wall or chimney breast removal requires the existing load to be temporarily supported (propped) while the new structural beam is inserted. The beam size, bearing length, and padstone specification are determined by the structural engineer. The installation sequence is: Install temporary propping to support the load above the opening. Cut and form the new opening, or remove the chimney breast within the opening. Install padstones (concrete or engineering brick load-bearing blocks that distribute the beam load into the existing masonry). Lift and install the steel beam (typically a universal beam in a galvanised mild steel finish). Remove temporary propping once the beam and padstones are correctly in place. Building Control inspection of the steel installation.

Floor joist repairs: Victorian floor joists (typically 200mm × 50mm or 225mm × 50mm timber, at approximately 400mm centres) frequently show signs of decay — particularly at the ends where they are built into the external wall (a point vulnerable to moisture penetration). The strip-out frequently reveals joists with partial or significant decay at their ends. These must be repaired or replaced before new floor finishes are installed. Repair options include: sistering (bolting a new joist alongside the decayed one); replacing the decayed section and supporting on a new galvanised joist hanger; or (for extensive joist decay) replacing the entire floor structure.

Party wall works: Where structural works are to be carried out on or adjacent to the party wall — including the installation of a chimney breast RSJ, the insertion of new joists into a wall, or excavation for underpinning — the party wall notice must already be in place and the party wall award must specify the working method and any monitoring requirements.

Foundation and drainage works for extensions: Where the project includes a rear extension, the concrete strip foundations or concrete raft must be excavated and poured during Stage 2. The depth of the extension foundation is determined by the structural engineer and must be at least 900mm below ground level (and deeper if the foundation is within the root zone of a mature tree in London clay soil).

First fix: First fix refers to the installation of the infrastructure (pipework, wiring, ductwork) that will be concealed within the walls and floors before plastering and boarding takes place. First fix typically runs concurrently across multiple trades:

First-fix plumbing: new hot and cold water pipework in copper or plastic press-fit; heating pipework to radiator positions; underfloor heating manifolds and pipe runs if UFH is being installed; wastewater runs for new bathrooms, kitchen, and utility; soil and vent pipe (SVP) routing. First-fix electrics: new consumer unit position; main circuit cables run to socket positions, light points, boiler, cooker circuit, EV charger circuit, security and data positions; cables chased into masonry or run in floor voids. First-fix HVAC: where MVHR (mechanical ventilation with heat recovery) or air source heat pump systems are being installed, the ductwork routing and penetrations through the external envelope are completed during first fix.

Key decision at first fix: zone the boiler and heating system. In a London terrace renovation, the decision to retain the existing gas boiler or upgrade to a heat pump, and the decision to retain traditional radiators or install underfloor heating (particularly on the ground floor slab if the project includes a rear extension on a new concrete floor), must be resolved before first fix begins — these decisions fundamentally affect the pipework routing, the zone layout, and the specifier positions.

Masonry and plastering: Once first-fix trades are complete and signed off by building control where required, the walls are prepared for plastering. In a Victorian terrace: New blockwork or brick partitions are built where new room layouts require new walls. External wall tie repairs and brick pointing are completed where required. All chased conduit and pipework runs are checked and the chases made good with backing plaster. New plasterboard is fixed to new stud partitions and to ceiling joists where ceilings are being renewed. Bonding coat plaster is applied to original masonry walls that are being skimmed. A two-coat plaster finish (bonding coat and finish coat) is applied to all new and existing walls. Plastering is a highly skilled trade — quality plastering significantly reduces the visible defects in the final painted finish.

Second fix: Second fix is the installation of all the visible items connected to the first-fix infrastructure — the parts of the house that the client sees and uses. Second fix typically runs concurrently across trades:

Electrical second fix: fit socket faceplates, switch faceplates, lighting pendants or recessed downlights, consumer unit connections, commissioning. Plumbing second fix: connect radiators, fit bathroom sanitaryware (basin, WC, bath, shower tray and screen), connect the kitchen sink, fit kitchen tap, commission the boiler. Joinery second fix: fit internal doors, door frames and architraves, skirting boards, window boards, staircase balustrades and handrails, wardrobe installations.

Finishes: Tiling: kitchen splashback tiling, bathroom tiling (walls and floor). Tile setting is labour-intensive and is one of the later trades — it follows second-fix plumbing. Kitchen installation: the kitchen is typically installed after tiling and before decoration, to allow the final dimensions to be confirmed against actual wall positions. Decoration: primer and two coats of emulsion on walls, primer and two coats of satinwood on woodwork. In a Victorian terrace, the quality of the decoration is heavily influenced by the quality of the preceding plaster skim — good plasterwork allows paint to be applied to a smooth, defect-free surface. Flooring: hard flooring (engineered wood, stone, LVT) is typically the last major trade item, installed after all other trades are complete to minimise the risk of damage during subsequent work.

Commissioning: The plumbing and heating system is commissioned and balanced by the heating engineer. The electrical installation is tested and certified by the electrician. MVHR is balanced and commissioned by the ventilation specialist.

Snagging and handover: A snagging inspection identifies defects and incomplete items — typically carried out by the client and contractor together, with agreed items logged and a completion date set for their rectification. A practical completion certificate is issued once all works are complete and outstanding defects have been remedied. The building control final inspection and completion certificate follow.