RIGHT BUILD GROUP · BLACKHEATH
House Extension in Blackheath
Give the new kitchen’s services a place in the design. Extract routes, connections and outside fittings should work with the extension’s elevation.
- Service routes agreed early
- External fittings considered
- Kitchen and construction coordinated
ARCHITECTURAL HOUSE EXTENSIONS
An outside wall has work to do.
An extension elevation can look settled while the kitchen behind it still has no agreed extract route. Later, a duct, grille or service enclosure must find space around windows, roof edges and the neighbour’s boundary. Develop those connections while the building shape can still respond. They are part of a useful room, not small additions to make after the glazing is ordered.
For a Blackheath enquiry, our extension construction service can be discussed from the kitchen equipment outward: which wall it needs, where the connections can run and how the new enclosure is built. Bring retained appliance information as well as drawings. The rear, side-return or combined form and its finishing scope can then be coordinated with your appointed designers and relevant installers.
FOOTPRINT STUDIES
Choose a footprint that can support the room.
Compare where each arrangement puts the kitchen, outside walls and retained service connections.
REAR EXTENSION
A rear room with a complete kitchen route
A rear extension can provide a good garden-facing kitchen, but the sink and cooking positions should be tested with feasible service routes. An island drawn in the centre needs more than a convenient electrical symbol. Supplies, waste and any ventilation arrangement must fit the assessed construction and remain maintainable.
Check where the room’s outlets will appear outside. Consider doors, opening windows and the intended outdoor sitting area, with the relevant product and installation requirements. Resolve the whole connection before choosing a kitchen position solely for its view.
SIDE-RETURN EXTENSION
Side-return width and the wall beside it
Infilling the side return may bring the kitchen closer to a boundary, changing the available routes for equipment and outlets. Establish the actual wall and ownership arrangement before relying on a proposed penetration or access from the adjoining land. A narrow space on a plan is not automatically a service corridor.
The former passage may already contain pipes, chambers or meters. Survey them before fixing the infill footprint. If the route currently provides garden or maintenance access, decide how those tasks will happen after enclosure rather than leaving them to the kitchen installer.
WRAPAROUND EXTENSION
A wraparound with connected service zones
A wraparound can separate cooking, utility and dining activities, provided the service arrangement follows that zoning. Compare a compact utility position near appropriate connections with one chosen only because it hides appliances from view. Access for maintenance and replacement needs a workable route.
Treat the combined roof, corner and external fittings as one design. Several small outlets placed independently can leave an untidy or difficult elevation. The full side-and-rear proposal also needs its planning position assessed as a whole, not as two apparently modest pieces.
OLD ROOM / NEW ROOM
Place equipment before closing the service design.
Prepare an equipment schedule for the kitchen installation, including proposed models where known. Extraction, water connections, electrical provision and replacement access can differ between products that look similar. Keep uncertain choices visible and identify the latest decision point before the construction needs their final information.
Draw the intended duct or pipe route with its relevant installer rather than simply marking an outlet on the wall. Structural members, roof falls and cupboards can all compete for that space. Where a route changes level or passes through retained rooms, include the necessary access and making-good in the building scope.
Look at the external fittings from the garden and the rooms above. Grouping decisions thoughtfully can make the elevation clearer, but appearance cannot override safe, suitable installation. Ask which positions are acceptable for the actual equipment and construction, then develop the finish around that assessed arrangement.
Think about the equipment’s full life in the room. The initial installation route may be available before the kitchen is fitted, but replacement will happen after cabinets and worktops are fixed. Ask how the relevant appliance or component comes out, which connections need reaching and whether any panel has to be removed. Give those requirements to the joinery designer so a neat enclosure does not rely on permanently trapping equipment inside.
Review noise and vibration from the intended equipment with the household routine. A utility cupboard beside the dining table may be convenient for connections but less comfortable during meals. Discuss the proposed products and construction with the relevant installer rather than expect a cabinet door to provide a particular acoustic result. A different position or operating routine may be worth comparing before the service routes are committed.
Keep a clear distinction between a kitchen supplier’s drawing and the complete building information. The supplier may show a connection point without defining the route through the extension or the repair in the old house. Identify who resolves those gaps and when. That helps the builder and installer work towards the same finished room rather than each assume the other party has allowed for the missing length of duct or pipe.
GROUND, LOADS & CONNECTIONS
Make room for services within the structural design.
Groundwork and service information
Locate drainage and other relevant buried connections before fixing the foundation arrangement. Distinguish private drains from public sewers or lateral drains, and identify any undertaker agreement required for building over or close to them. The kitchen plan should not settle the footprint before those questions are answered.
Foundation design follows the assessed loads and ground conditions, including trees and nearby construction. Establish the investigation and professional input needed. A double-storey option changes the loads and upper-room arrangement; an existing addition cannot be presumed capable of supporting another floor.
Openings and concealed routes
The support for the opening into the house needs an appropriate structural design. Bearings, columns and beam depths can affect the route to a hob, sink or ceiling outlet. Share the service requirements with the engineer while they can still be coordinated, rather than requesting informal holes through completed support.
Agree temporary support, weather protection and the point when the retained house is opened to the addition. If the old kitchen remains in use during early construction, identify when its services will be disconnected and what the household will do afterwards.
THE DESIGN TRADE-OFFS
Compare the room and its connections together.
Use the building shape to support a serviceable layout.
| Extension | Useful gain | Main check | Resolve before ordering |
|---|---|---|---|
| Rear | A garden-facing kitchen | Sink, cooker and outlet routes | Equipment positions before enclosure |
| Side return | Additional working width | Boundary and existing passage services | Feasible penetrations and maintenance |
| Wraparound | Separate kitchen and utility zones | Combined roofs and service paths | One coordinated outside elevation |
| Double storey | Additional upper rooms | Loads and stacked service demands | Whole-building system and layout |
ROOF, GLASS & DAILY COMFORT
Balance glazing with the working walls.
A kitchen needs useful daylight on the surfaces where work happens. Test rooflight and window positions with tall units, the hob and the sink already shown. An uninterrupted glass wall can remove the place needed for storage or equipment, leaving the room larger but harder to arrange.
Review summer sun, shading and opening ventilation as part of that layout. Extract provision for cooking and comfort ventilation answer different questions. High-level openings need a practical way to operate and maintain them, with roof drainage and access resolved before specialist glazing is ordered.
THE COMPLETE BUILDING
Keep the enclosure and its connections complete.
Weathering around penetrations
The sink or utility position needs a feasible connection to the drainage that actually serves the property. Locate that connection and establish its ownership before fixing the kitchen and foundations. If a public sewer or lateral drain is affected, identify the undertaker’s required build-over or diversion process instead of treating a small pipe move as routine fitting work.
Plan accessible maintenance without compromising the finished room. A removable enclosure should remain removable once shelves and stored belongings are present. Use the equipment’s real access needs rather than assuming a small panel anywhere nearby will be sufficient.
Heating and electrical provision
Assess the existing systems for the added room and equipment. New floor area, altered glazing and changed occupancy can affect heating and control decisions. Coordinate these with the thermal design instead of selecting emitters only after cabinetry fills the walls.
Record any work extending through retained rooms and define its repair boundary with the wider house refurbishment. Where fitted enclosures are needed, discuss the joinery with the installer so that appearance, ventilation and future access remain compatible.
BLACKHEATH / THE EXISTING SETTING
Start with the actual Blackheath property.
Before developing a kitchen outlet, establish whether the outside wall belongs to a whole house or forms part of a shared building. In the Census 2021 figures presented by Lewisham’s Blackheath ward profile, flats are the largest accommodation group, alongside terraces and semi-detached homes. That defined ward context makes the ownership question worth raising early; the lease and actual building information must answer it for the property.
For a flat, clarify ownership of the garden, external fabric and relevant service routes, with the appropriate lease and management information. A proposed outlet may cross a part of the building outside the private room. Resolve that authority before the construction programme depends on it.
For a house, trace the connections serving earlier additions and compare them with the new equipment brief. The neighbourhood name does not reveal how the kitchen was previously altered. Bring known records and let the survey establish what the extension can retain, renew or route differently.
FROM FIRST BRIEF TO FINAL DETAIL
Coordinate the room before fitting the equipment.
Explain the kitchen brief
List equipment, utility activities and items proposed for retention.
Survey the connections
Locate services, drains, outside walls and relevant ownership boundaries.
Resolve the combined design
Coordinate structure, outlets, enclosure and the required approvals.
Build and connect
Sequence shell work and service installation before closing the routes.
Fit, demonstrate and review
Check access, controls, finishes and relevant installation information.
SCOPE, ALLOWANCES & SEQUENCE
Price the route as well as the appliance.
Compare quotations using the same equipment and connection information. An allowance for installing a kitchen does not necessarily include a difficult extract route, altered drainage or repairs through retained rooms. Identify those tasks explicitly so they are neither omitted nor counted twice.
Keep supplier and installer responsibilities clear. Confirm who provides equipment information, checks delivered products and makes the final connections. A late substitution should be reviewed for service and fitting consequences before it is accepted merely because it fills the same cabinet opening.
Set decision dates for the equipment that affects concealed work. The roof and walls may be ready to close before the kitchen arrives. Agree how unresolved choices will be handled, and include realistic arrangements for temporary cooking, security and household access during the connection stage.
| Cost factor | Question for the quotation |
|---|---|
| Equipment choice | Are the selected models and requirements known? |
| Extract and outlets | Are complete routes and outside fittings included? |
| Connections | Which existing services need assessment or alteration? |
| Making-good | Who repairs retained rooms affected by the routes? |
ARCHITECTURAL CONCEPTS
A kitchen elevation with its services considered.
Architectural concepts consider working walls, rooflight positions and the relationship of inside equipment to the extension outside.
QUESTIONS BEFORE COMMITTING
Plan with the right questions.
When should the extractor be chosen for an extension kitchen?
Before its route and connected construction are fixed. Obtain the selected equipment’s requirements and coordinate them with the relevant installer.
Can a vent be added wherever there is a clear patch of wall?
No. Its suitable position depends on the equipment, construction and relevant requirements, with ownership and external appearance considered too.
Does an island need service decisions before the floor is built?
Yes. Supplies, waste and electrical provision should be assessed and coordinated before construction makes routes difficult to change.
Can a utility cupboard hide all the connections?
An enclosure must suit the equipment and retain required access and ventilation. Agree its detail with the installer before joinery is made.
Do cooking extraction and opening windows serve the same purpose?
They should not be treated as interchangeable. Assess cooking extraction and the room’s wider ventilation and comfort needs together.
What changes if the property is a garden flat?
Planning rights, garden and wall ownership, lease conditions and shared services need checking before a whole-house route is assumed.
Should supplier substitutions be accepted during the build?
Review the new model’s connection, dimensions and ventilation requirements before approval. Similar appearance does not establish installation compatibility.
How can outlet positions be reviewed visually?
Show them on the external elevation alongside windows, doors and roof edges, then confirm that the arrangement remains suitable for the actual installation.
HOUSE EXTENSIONS NEARBY
A different address, a fresh assessment.
LET’S DISCUSS YOUR EXTENSION
Give the kitchen connections a place in the plan.
Tell us about the equipment and activities the new room must support. We can discuss the construction and fitting scope.