Electrical Planning Before a House Renovation: What to Decide Before Plastering
Electrical work is one of the most important parts of a house refurbishment, yet it is often planned too late. Homeowners may spend weeks selecting kitchen finishes, flooring and paint colours while leaving socket positions, lighting arrangements and electrical capacity until construction is already underway.
This can become expensive. Once walls have been plastered, ceilings closed and joinery installed, moving a socket or adding a lighting circuit may require newly finished surfaces to be opened again.
A well-planned electrical installation should support how the property will be used, meet applicable safety requirements and accommodate realistic future needs.
Whether you are renovating a Victorian terrace, modernising a London flat or undertaking a whole-house refurbishment, electrical decisions should be coordinated with the layout, plumbing, heating, kitchen design and construction programme.
Start with an assessment of the existing installation
Before deciding whether to rewire, arrange for a competent electrician to assess the existing installation and its suitability for the proposed works.
The age of the wiring alone does not determine whether it must be replaced. Its condition, protective arrangements, capacity, earthing and bonding, and compatibility with the new layout all matter.
An Electrical Installation Condition Report (EICR) may be useful when assessing an existing installation, particularly when purchasing or extensively refurbishing an older property. However, an EICR is not a substitute for designing and certifying new electrical work.
Ask the electrician to establish which circuits can reasonably be retained and which need alteration or replacement.
Design socket positions around furniture and everyday use
Socket placement should follow the furniture layout rather than simply repeating the existing positions.
Consider where beds, desks, sofas, televisions and storage units will sit. A socket behind a fitted wardrobe or directly beneath a large piece of furniture may be inconvenient or inaccessible.
In kitchens, coordinate socket positions with appliances, worktop heights, splashbacks and cabinetry.
- Identify fixed furniture and appliance locations.
- Allow accessible connections for equipment requiring isolation.
- Consider home-working, charging and entertainment needs.
- Agree socket finishes and positions before first fix.
The objective is not necessarily to install the greatest possible number of sockets, but to provide convenient, appropriately located outlets without relying on extension leads.
Plan lighting before ceilings and walls are closed
Lighting design affects both the appearance and practicality of a renovated home.
A room may benefit from several types of lighting rather than a single central fitting. General lighting provides everyday illumination, task lighting supports activities such as cooking or reading, and accent lighting highlights architectural features.
The location of downlights should be coordinated with joists, insulation, ventilation ducts and other concealed services.
Where recessed fittings penetrate fire-resisting construction, suitable products and installation details are essential to maintain the required performance.
Switch positions, dimming arrangements and control zones should be agreed before wiring begins. Compatibility between dimmers, drivers and LED fittings should also be checked.
Consider the electrical demands of kitchens and bathrooms
Kitchens frequently contain some of the highest electrical loads in a home.
Induction hobs, ovens, dishwashers, washing machines and other appliances may require particular circuit arrangements depending on their ratings and installation instructions.
Bathrooms introduce additional requirements because of the increased risk associated with electricity and water.
Electrical equipment must be suitable for its location, with appropriate protection and compliance with the relevant bathroom installation requirements.
The electrician should coordinate with the kitchen designer, plumber and bathroom installer before finalising the electrical layout.
Do not assume that an existing circuit is suitable simply because a replacement appliance appears similar to the original.
Check the consumer unit and available electrical capacity
A renovation is an appropriate time to review the consumer unit and the property's electrical capacity.
Modern protective devices, including residual current protection and arc fault detection where required by the applicable standards, may be relevant to the design.
However, replacing a consumer unit is not automatically necessary for every refurbishment. The decision should follow a proper assessment.
If the project introduces an electric vehicle charger, heat pump, electric heating or additional high-load appliances, the electrician should assess maximum demand, diversity and the suitability of the existing supply.
Where the available capacity is insufficient, discussions with the electricity network operator or other relevant parties may be needed.
Coordinate first-fix electrical work with the building programme
Electrical first fix usually takes place after the relevant structural and layout work has been established but before walls and ceilings are permanently closed.
The electrician needs sufficient information about partition positions, ceiling construction, kitchen layouts and fitted furniture to install cables and back boxes correctly.
Changes after first fix can affect labour costs, materials and the programme.
Before plastering, arrange a coordinated inspection of the installation and confirm that the agreed socket, switch, lighting and equipment positions have been provided.
Photographs of concealed cable routes can be useful for future maintenance, although they do not replace formal inspection and testing.
Understand Building Regulations and electrical certification
Domestic electrical work in England is subject to relevant Building Regulations requirements, including Part P.
Certain types of work are notifiable to building control, including the installation of a new circuit, replacement of a consumer unit and specified work within bathroom zones.
Not all electrical alterations require building control notification, but work must still comply with applicable safety requirements.
A registered competent person can self-certify eligible notifiable work under an authorised scheme. Alternatively, the appropriate building control route must be arranged.
On completion, the relevant electrical certificate should be provided, together with Building Regulations compliance documentation where applicable.
Allow for electrical work in the renovation budget
Electrical costs depend on the property's size, accessibility, existing installation, specification and extent of alterations.
A partial alteration to an existing circuit is very different from a complete rewire involving new distribution equipment, extensive chasing and multiple specialist lighting systems.
Ask for a quotation that clearly identifies the proposed scope and exclusions.
- Number and type of sockets, switches and lighting points.
- New circuits and consumer unit work.
- Specialist lighting, controls and equipment connections.
- Testing, certification and making-good responsibilities.
Decorative making good, plaster repairs and final light fittings may be priced separately. Clarifying these items before work begins helps avoid disagreements.
Make electrical decisions before approving the final scope
The most effective electrical planning takes place before the contractor begins closing up the building.
Review the electrical drawings alongside the kitchen plan, bathroom layout, furniture arrangements and lighting specification.
A final walkthrough with the electrician and refurbishment contractor can identify conflicts that are difficult to spot on drawings alone.
Changes are sometimes unavoidable, but an agreed layout, clear specification and coordinated programme significantly reduce the likelihood of unnecessary rework.
Plan your refurbishment with Bayocorp
Bayocorp undertakes whole-house refurbishments, kitchen and bathroom renovations, extensions and interior fit-outs across London and the South East.
We coordinate electrical specialists alongside the other trades so that socket positions, lighting, appliance connections and concealed services are considered before finishes are installed.
Contact Bayocorp to discuss your refurbishment plans and develop a coordinated scope of works before construction begins.
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