Kitchen side return and wraparound extensions

The short answer: which kitchen extension is right for your London home?

A side return extension uses the narrow passage beside a typical London terrace. A rear extension projects into the garden across the back of the house. A wraparound extension combines both. It creates the greatest increase in ground floor space.

The right option depends on the property, planning constraints and garden depth. Structure, drainage, natural light and budget matter too. So does how your family wants to live. For many West London homes, the strongest result is not simply the largest extension. It is the design that improves flow, light, storage and connection to the garden. It does this without losing the character of the original house.

NU Projects runs architecture, interior design, quantity surveying, structural and MEP coordination. Construction, bespoke joinery and aftercare run through the same team, under one contract.

Kitchen extension options at a glance

• Side return extension: suited to widening a narrow Victorian or Edwardian kitchen. It preserves most of the garden depth
• Rear extension: suited to creating a broader connection between the house and garden
• Wraparound extension: suited to maximising ground floor area where the site and approvals allow
• Two storey extension: suited to where the brief also needs space above the kitchen
• Internal reconfiguration: sometimes the right answer when better flow can be achieved. It avoids the cost and disruption of a large external addition

Side return kitchen extensions

The side return is the narrow strip of land beside the rear projection. It is found on many London terraced and semi detached houses. Building into this area can transform a narrow kitchen into a wider room. That room can hold an island, dining table, family seating and better storage.

Why choose a side return extension?

• It can significantly improve the width and proportions of the kitchen
• It usually preserves more garden depth than a full rear extension
• It can connect previously divided kitchen and dining areas
• Rooflights can bring daylight into the centre of the plan
• It suits many Victorian and Edwardian terraces across West London

The main design risk is creating a deep internal plan with insufficient light. The position of roof glazing and the height of the new roof matter. So does the size of the opening into the original house. So does the reflectance of internal finishes. All four must be considered together.

Rear kitchen extensions

A rear extension projects from the back of the property into the garden. It can extend across the width of the house. It can create a stronger relationship between the kitchen, dining area and outdoor space.

Why choose a rear extension?

• It can create a full width kitchen and family room
• It offers generous opportunities for garden facing glazing
• It may suit properties without a usable side return
• It can provide space for dining, seating and concealed storage
• It can work with a flat roof, pitched roof or carefully designed roof glazing

Garden loss must be assessed honestly. A well proportioned extension should leave usable outdoor space. It should create a better relationship between inside and outside. That matters more than simply maximising floor area.

Wraparound kitchen extensions

A wraparound extension combines a side return and rear extension. It can unlock the largest ground floor transformation. But it also demands the most careful planning, structural and services coordination.

Why choose a wraparound extension?

• It can create a large open plan kitchen, dining and living space
• It allows greater freedom over the location of the kitchen and island
• It can improve circulation from the entrance through to the garden
• It creates opportunities for a utility room, pantry or concealed back kitchen
• It can support a complete rethinking of the ground floor

A wraparound proposal should be tested early against local planning policy. Permitted development rules, neighbour impact, drainage and the garden retained need testing too. In many London locations, a carefully prepared planning application is the clearest route.

Planning permission and permitted development

Some house extensions can be built under permitted development rights. Every applicable limit and condition must be met. That does not mean every side return or rear extension is automatically permitted.

Property type, previous additions and planning conditions can restrict permitted development rights. So can an Article 4 direction, designated land or local constraints. Flats and maisonettes do not benefit from the same householder permitted development rights. Listed buildings can also require listed building consent.

Before design progresses, NU Projects reviews the planning history, property status and local policy. Where permitted development appears available, a lawful development certificate can confirm it before construction.

The national starting point is the Planning Portal extensions guidance. See also the detailed GOV.UK householder permitted development guidance. Project specific advice should still be obtained before work starts.

Building Regulations approval

Planning permission and Building Regulations are separate systems. Even where planning permission is not required, an extension normally needs Building Regulations approval.

The technical design must address structure, foundations, fire safety and thermal performance. It must also address ventilation, drainage, electrical safety, glazing and moisture control. It must address the relationship with the existing house too.

A structural engineer will usually be needed where external walls are removed or widened. The same applies where new beams are introduced or foundations are built. It also applies where loads are transferred through the existing structure.

The official Building Regulations Approved Documents explain the national standards used in England.

Party wall matters and neighbours

A kitchen extension can trigger the Party Wall etc. Act 1996. It covers work on a party wall, or building at or near a boundary. Excavation within the distances and depths covered by the Act can trigger it too.

The correct notices and programme should be considered before construction begins. Party wall procedures do not replace planning permission or Building Regulations approval. They should not be left until the contractor is ready to start on site.

Homeowners can review the official GOV.UK Party Wall guidance. They can also obtain project specific advice from a qualified party wall surveyor.

Drainage, sewers and ground conditions

Many London side returns contain drainage runs, inspection chambers or shared sewers. The design may require drainage surveys, diversion or protection. It may also need a build over agreement with the relevant water authority.

Foundation design also depends on soil, trees and neighbouring structures. The depth of existing foundations matters too. These issues need investigating before the cost plan and programme are treated as fixed.

CDM 2015 and a properly managed site

CDM 2015 applies to construction work, including domestic extensions. For domestic clients, duties normally pass to the contractor or principal contractor. Which one depends on the project structure. Some projects involve more than one contractor. There, the correct principal designer and principal contractor appointments must be understood.

NU Projects plans design risk, construction logistics, temporary works and access. Dust, noise, welfare and protection of the existing home are planned too. All of this is part of the delivery strategy.

The Health and Safety Executive domestic client guidance explains how these duties operate.

Designing the kitchen extension around real life

A successful kitchen extension begins with daily routines, not a preferred photograph. The design should consider how people arrive, cook, eat, entertain and work. It should consider how they supervise children and access the garden. It should also consider how they store the equipment of family life.

Layout and zoning

Open plan does not have to mean one undivided room. Changes in ceiling height, lighting, furniture, floor finishes and joinery can create defined zones. Those zones serve cooking, dining and relaxing while preserving a sense of space.

Natural light

Large garden doors are only one source of daylight. Rooflights and clerestory glazing can bring light into the original part of the house. So can internal glass screens and carefully positioned openings. Glazing must also be balanced against privacy, heat loss and summer overheating.

Kitchen position

Placing the kitchen in the darker central zone can keep the garden elevation free. Dining and seating can then take that side. But that position requires excellent task lighting and ventilation. Positioning the kitchen beside the garden creates a stronger outdoor connection. But it may reduce flexible living space. The right answer follows the brief.

Storage and back of house space

A pantry, utility room or boot storage keeps the main kitchen calm and uncluttered. So does a concealed appliance zone. These spaces should be included at concept stage. They affect circulation, drainage, ventilation and joinery.

MEP, lighting and comfort

The extension changes the home’s heating, cooling, ventilation and hot water requirements. It changes its drainage, electrical and lighting requirements too. These systems should be designed with the architecture and interiors. They should not be added after the layout is complete.

• Underfloor heating zones and floor build ups
• Mechanical extract and make up air for cooking
• Lighting scenes for preparation, dining and evening use
• Power and data for appliances, islands and home working
• Cooling and solar control where large areas of glazing are proposed
• Hot water demand and plumbing routes
• Audio visual, security and smart home controls
• Access for future maintenance

NU MEP coordinates these elements with ceilings, joinery, structure and lighting. The finished space then remains visually calm and technically dependable.

How much does a kitchen extension cost in London?

There is no reliable single figure for a premium London kitchen extension. Old online cost bands often exclude the kitchen, glazing, professional fees and structural complexity. They often omit MEP upgrades, bespoke joinery, temporary works, contingency and VAT too.

The main cost drivers are:

• Extension type, size and structural opening
• Ground conditions, foundations and drainage
• Planning, surveys and professional design
• Glazing, roof construction and thermal performance
• Kitchen, appliances and bespoke joinery
• Mechanical, electrical and lighting requirements
• Stone, flooring and specialist finishes
• Access, neighbour constraints and site logistics
• Temporary accommodation or protection of occupied areas
• Contingency and VAT

NU Projects prepares an early cost plan. The plan is developed as surveys, drawings and specifications become more detailed. This is the route to cost certainty. A generic price per square metre is not.

There is wider budgeting guidance in the journal. Read How Much Does a High End Home Renovation Cost in London in 2026?.

How long does a kitchen extension take?

The construction period is only one part of the programme. A realistic plan includes feasibility, surveys, concept design and planning or lawful development confirmation. It also covers technical design, structural engineering, Building Regulations and party wall matters. Then come procurement, construction, commissioning and handover.

Bespoke glazing, kitchens, appliances, joinery and specialist finishes can influence the critical path. Early decisions improve certainty. But speed should never cost a coordinated design or safe delivery.

The NU Projects kitchen extension process

• Private consultation and initial property review
• Measured survey, planning history and feasibility
• Architecture and concept options
• Initial cost plan and programme
• Planning or permitted development strategy
• Structural, Building Regulations and MEP design
• Interior design, kitchen, lighting and material specification
• Party wall, drainage and procurement coordination
• Construction, fit out and quality inspections
• Testing, commissioning, handover and aftercare

How NU Projects runs a London kitchen extension

NU Projects has delivered complex design and build projects in London since 2010. The business combines architecture, interior design, quantity surveying and construction. It runs MEP, bespoke joinery and aftercare too, through one senior led team.

Founder Nick Jeffries keeps the client brief and quality standard visible. Matt Coverley, the quantity surveyor, manages cost planning and commercial control. Wayne Hockham, MEP Director, coordinates the services. They make the finished kitchen comfortable and reliable.

This integrated structure reduces gaps between consultants and gives the client clearer accountability. Design, cost, structure and services can then be resolved before they become site problems.

View completed work in the NU Projects portfolio. Read about the founder on Nick Jeffries’ page.

Frequently asked questions

Is a side return or rear extension better?

A side return often suits widening a narrow kitchen while preserving garden depth. A rear extension can create a broader connection to the garden. The right option depends on the existing plan and site constraints. It also depends on how the household wants to use the space.

What is a wraparound kitchen extension?

A wraparound extension combines a side return and rear extension. It can create the largest increase in ground floor space. But it requires careful planning, structural, drainage and neighbour assessment.

Does a kitchen extension need planning permission?

Some house extensions can qualify as permitted development. Every limit and condition must be met. Other projects require planning permission. Flats, maisonettes, listed buildings and constrained sites need particular care. Always obtain property specific advice.

Does a kitchen extension need Building Regulations approval?

In most cases, yes. Building Regulations address structure, fire safety, insulation and ventilation. They also cover drainage, electrical safety and other technical requirements. They apply even where planning permission is not required.

Will I need a party wall agreement?

Possibly. The Party Wall etc. Act can apply to work on a party wall. It can also cover construction near a boundary. Certain excavations close to neighbouring buildings can trigger it too. A party wall surveyor should review the proposed work early.

Can I live in the house during the extension?

Sometimes. The answer depends on access, temporary kitchen arrangements and services shutdowns. Dust, noise, children, pets and the extent of internal work matter too. NU Projects assesses occupation as part of the logistics plan.

How do I choose a kitchen extension company in London?

Ask who carries the architecture, the interior design and the quantity surveying. Ask who carries the construction, the MEP and the joinery. Where those sit in one firm, a problem has fewer gaps to fall into.

Plan your kitchen extension with NU Projects

A kitchen extension should transform how your whole home works. Protect the design, budget and programme before important decisions are fixed.

You may be considering a side return, rear or wraparound extension in London. If so, book a private consultation with NU Projects or call 020 7731 6841. Bring the team in early. Create one clear route from first sketch to final handover.