PAYTE
Extension Architect Marylebone
Principal Designer & Higher Risk Building Expert
Our Marylebone architects have extensive experience in extension architecture, specialising in loft conversions, basement extensions, bespoke extensions, rear extensions, two-storey and single-storey extensions, contemporary designs, double-storey extensions, Mansard roof extensions, and ground-floor extensions.
house extension architect Marylebone
Our firm specialises in house architecture in Marylebone, most commonly Victorian houses. We take pride in helping our clients enhance their property value while optimising space. We create bespoke designs and contemporary design extensions with interior reconfigurations to maximise natural light and extra space. Our creative design team elevates the planning process to a new level.
As a leading architectural practice, we specialise in helping homeowners navigate the planning process, building regulations, planning permissions, party walls, and building control. Our experienced team handles all regulatory challenges in extension projects, making your home’s transformation seamless and stress-free.
We carry out architectural work for rear, wraparound, side return, or infill extensions to best suit your space and increase its value. We begin with our design process, initial drawings, structural calculations, and 3D visualisations to assist clients in picturing the transformation, alongside a precise scope of work for the building contractor. Let us help expand your floor space and elevate your property’s worth. Our expertise ensures that each project is expertly designed to meet your specific needs.
Being experienced extension architects in West London, we deliver bespoke residential design solutions tailored to the character, planning context, and long-term value of each home.
apartment Extension architects
We specialise in providing comprehensive design and architectural services for apartment extensions in Marylebone. Our offerings include detailed planning advice, design layout changes, custom joinery, and regulatory drawing preparations. Whether you are looking to completely revamp your apartment’s layout or to implement specific modifications, we manage every aspect of the project.
Our services encompass the entire process, from securing planning permission and building approvals to obtaining landlord consents and the necessary license to alter documentation. We also handle all planning applications ourselves.
Additionally, we offer project management as part of our complete service package. Our architectural service ensures a seamless transformation of your space, enhancing both functionality and aesthetics to create modern, stylish living environments.
As an experienced house extension architect, we design thoughtful, well-considered extensions tailored to each property’s character, planning context, and long-term value.
extension conversion package
3 Meter rear extensions package
£60,000.00 INC. VAT
What’s included:
6 Meter rear extensions package
£104,700.00 INC. VAT
What’s included:
At Payte Architects London, our rear extension service is about making it simple to gain more space without losing control of cost or complexity. With over 10 years’ experience on Marylebone homes, we offer two fixed‑price packages at three and six metres (including VAT), so you choose how far to extend and we handle design, approvals and on‑site work up to first fix.
You’ll work with a friendly architectural team that actually picks up the phone. All architectural work is carried out by architects registered with the Architects Registration Board (ARB) or chartered with the Royal Institute of British Architects (RIBA), and we coordinate closely with our dedicated extension build team so design and construction stay joined‑up from day one.
We take care of the planning route – from Lawful Development Certificates for three‑metre projects to prior‑approval applications for six‑metre schemes – using our experience with boroughs such as Haringey Council’s planning team, Lambeth Council’s planning service and Brent Council planning to shape proposals around what local councils typically support.
Throughout, we keep communication simple and regular so you always know where your project is and what’s coming next, aiming for a bright, well‑built Marylebone extension that quickly becomes the main room everyone uses.
Exclusions
This package is not applicable to property where you need planning permission or listed building consent, or if there is an article 4 on your property.
In addition to the above, the following exclusion applies:
- Party wall award
- Building control fees
- Any specialist consultants
- Asbestos removal fees
- Finishing (sanitary ware, tiling, floor finishing, wall finishing, joinery).
- Party wall award
- Building control fees
- Any specialist consultants
- Asbestos removal fees
- Finishing (sanitary ware, tiling, floor finishing, wall finishing, joinery).
ARRANGE A FREE CONSULTATION
Arrange a free consultation with our luxury architects, we offer clients a 30 minute consultation.
FREE NO OBLIGATION CONSULTATION
VIRTUAL CONSULTATION AVAILABLE
ON SITE CONSULTATION AVAILABLE
Innovative Marylebone Extensions Crafted with Exceptional Architecture
Our Marylebone architects create smart, sustainable extensions that suit your space perfectly.
Wraparound
We specialise in wrap-around extensions. This is a popular way to expand and transform properties. This extension combines a rear and side addition. It creates an L-shape that expands ground-floor space. This is ideal for open-plan kitchens, living spaces, or adaptable rooms that fit modern lifestyles. We handle everything from design and planning permission to construction.
Single Storey
A single-storey extension can really boost space in your Marylebone property. It can be added to the back or side of the property. This addition offers more space for a modern kitchen, a living area, or a home office. This extension improves the flow inside and makes the property more practical. Our architectural team makes it easy for you to get great results that suit your property.
Multi Storey
A multi-storey extension in Marylebone can provide a lot of space. You can use it for extra bedrooms, bigger living areas, or more bathrooms. Building up on your property lets you make the most of it without losing any garden space. We take care of everything. This includes planning, permissions, and construction. We ensure your extension fits well with the current architecture.
Side Return
A side return extension utilises the unused space beside your home. You often find this add on in Victorian and Edwardian buildings in Marylebone. Clients can extend into this narrow area to make a wider, open-plan kitchen. This change will let in more natural light. Our architects are experts in side return extensions. These designs boost functionality and add to the property’s value.
Rear Extension
A rear extension expands the back of your property. This gives you room for an open-plan kitchen, a larger dining area, or a more spacious living room. This is ideal for clients looking to improve their ground floor. These extensions boost natural light and link indoor and outdoor spaces smoothly. We create rear extensions that match your home’s style. They also boost efficiency and value.
Seamless Marylebone Home Extensions from Concept to Completion
Our team of architects, designers, and builders in Marylebone creates stylish and practical home extensions. We handle each stage, from the first meeting to the final build, with care and precision.
Free Initial Consultation
In your 30-minute free consultation, we’ll discuss your project vision, design choices, size, and budget for the extension. This process ensures that we can align your ideas with the practical aspects of the project with accuracy.
Full Architecture Service
We offer bespoke services for home extensions. This features on-site assessments, detailed drawings, 3D visualisations, planning applications, and tender management. We customise each service to meet your unique needs.
Planning & Permissions
Our Marylebone architects focus on extension planning. Our professional practice handles it all, from the initial idea to final approval. We carefully find ways to handle local rules, stay within zoning laws, and meet building codes.
Complete Building Works
We’re a full-service architecture firm that specialises in extensions. We have in-house architects, interior designers, and building contractors. Our team ensure easy collaboration, guiding your project till its delivery.
Local Topic
General information only. Planning and licensing rules change and depend on the individual property. This article is not legal or professional advice.
MARYLEBONE — THE NORTH-FACING EXTENSION: WARM AND BRIGHT ON THE WRONG SIDE (DOC L; DESIGN)
There’s a particular expression clients wear when they tell us their Marylebone garden faces north. Apologetic, mostly. Braced.
They’ve seen the sun-flooded kitchen three doors down on the south side of the street, and they’ve arrived resigned to the budget version — cooler, dimmer, second best. Half of every street backs north; half of London’s extenders wear this face.
Here’s what years of building on the “wrong” side have taught us: the resignation is misplaced. North rooms aren’t worse rooms.
They’re different rooms — and designed as what they actually are, they’re frequently the ones households end up preferring.
Ask an artist. They’ve been demanding north light for three centuries, and not out of contrariness.
Because think about what south light actually does all day. It moves. Beams travel the room, glare lands on the worktop at breakfast, stripes crawl across the television by evening, and August turns the whole arrangement into a negotiation with blinds.
North light is the opposite creature: even, cool, shadowless, essentially constant from first coffee to dusk. Nothing washes out. Nothing burns. Colour tells the truth all day long. The Society of Light and Lighting’s literature has the science; every painter since the Georgians has the practice.
So the design strategy simply flips. A south extension spends its cleverness managing an excess. A north one harvests a steady resource — and harvests it from above, which is the part people don’t expect.
The sky over a north garden is bright even though the sun never enters it, so rooflights and lanterns do disproportionate work here. Which is why these projects start with an orientation audit at feasibility: where the sky light actually comes from, where the neighbouring buildings shade, what the section has to do to reach up and catch it. The glazing then goes where that analysis says — not where the catalogue suggests.
Finishes join the harvest too. Pale floors and ceilings bounce the even light deep into the plan; warmer material tones take the coolness out of the light itself. A room can be north-lit and honey-coloured. Ours usually are.
One honest sentence covers the thermal side: a north extension gets no free solar heating in winter, so the fabric has to be genuinely good rather than merely legal. Approved Document L sets the floor; on north-facing work we specify above it — better glazing values, junctions insulated properly — because every watt matters more on this side of the street. Underfloor heating suits these rooms beautifully, constant warmth under constant light, and the Energy Saving Trust makes the fabric-first case in plain English.
Westminster treats a north-side rear like any other application — though the daylight conversations with neighbours tend to run gentler, since your shadow falls on your own garden. A small mercy, gratefully banked.
And the finished room? It has the one quality the south side never gets: calm. No blinds at four o’clock. No greenhouse in August. Steady, truthful, all-day light in a room engineered to hold its warmth. The wrong side of the street turns out to be a rumour — started, as far as we can tell, by people who never designed for it.
Marylebone Home Extension Planning, Design, and Construction
Feasibility Studies for Home Extensions
Our Marylebone property extension architects carry out comprehensive feasibility studies. They look at structural integrity, space potential, and costs. This ensures that property expansions are smart and efficient.
Planning Permission for Extensions
Our team of architects collaborates with local councils. We navigate planning policies, building codes, and zoning laws to ensure smooth compliance. Our expertise simplifies the process, providing a stress-free experience.
Project Management and Contractor Coordination
We monitor construction progress, project timelines, and project quality. This way, we ensure everything operates without issues and according to schedule. We focus on details to ensure everything runs smoothly from start to finish.
Sustainable Extension Materials & Energy Efficiency
Our eco-friendly extension designs and insulation solutions improve property energy efficiency, sustainability, and comfort. Our approach reduces environmental impact and improves thermal performance.
Structural Engineering and Load-Bearing Analysis
We check that extensions meet safety, stability, and regulatory standards. We do this with structural assessments and compliance checks. Our team makes sure that a property extension blends in well, is safe, strong, and built to endure.
Interior To Exterior Extension Flow and Aesthetic Integration
Our architects mix new extensions with the current style. This creates a smooth transition between the old and the new. Our architects respect the original structure while enhancing functionality, aesthetics, and flow.
why work with us?
Fast Turn Around
We deliver swift completion of extensions by leveraging our efficient planning, expert team, and streamlined project management, ensuring a smooth and expedient process.
Fixed Pricing
We provide transparent, fixed pricing for architectural and building services for extensions, offering clients a clear understanding of costs. This approach allows for confident budgeting.
We Maximise Value
We guide clients to achieve the best outcome for extensions, balancing the investment benefits with a comfortable living space. Our expert advice ensures maximum financial value.
Turnkey Operation
We offer a full-service for home extensions, guiding clients from the initial consultation to project sign-off. You will have a dedicated account manager overseeing every detail.
recent EXTENSION projects
Local Topic
General information only. Planning and licensing rules change and depend on the individual property. This article is not legal or professional advice.
MARYLEBONE — JOINERY-FIRST: DESIGNING THE FITTED INTERIOR OF A MARYLEBONE EXTENSION (BWF)
A client rang us last spring about a squeaky hinge. That was the whole complaint, eighteen months after handover — one hinge, in a wall of cupboards that had swallowed her family’s entire chaos since the day they moved back in. We fixed it in ten minutes and counted the call as a review. Because that wall of cupboards, not the glass roof everyone photographs, is why the extension works. And it was drawn before the walls were.
Here’s the thing about extending in Marylebone that nobody puts in the brochure: the new room has two jobs. Space is the obvious one. Order is the one that decides whether the house actually improves — all the storage and concealment and fitted intelligence that lets a compact central-London home absorb real life without drowning in it. That second job belongs to joinery.
And joinery stopped being a finishing trade on our projects years ago. It moved to the front of the queue.
Why? Money, partly. Floor area trades at silly prices here, and a wall that only divides is a wall not earning. Line one side of the new extension with a 600-millimetre storage zone — utility machines, pantry, the coat mountain, a decade of paperwork — and the room left over lives larger than a bigger empty one.
We’ve stood clients in both versions at design stage. Nobody has ever picked the empty one.
Partly, though, it’s opportunity. An extension hands the cabinetmaker things the old house never will: straight walls. True corners. A ceiling height chosen with the bench heights, the appliance voids, the datum line that runs the whole room. Everything drawn together, so the fitted work fits on purpose instead of being scribed against two centuries of settlement. And the services land where they belong — socket inside the cupboard, extract behind the larder vent — rather than arguing with finished plaster in month nine.
Sequence is everything. Late joinery is compromise wearing a nice veneer.
The buying side deserves plain speaking, because “bespoke” covers a lot of sins. The market runs from flat-pack carcasses in handsome clothing to genuine workshop cabinetmaking, and the specification is where the two confess.
Carcass material — solid or veneered, and which veneer on what. Drawer-runner ratings. Hinge cycles (my springtime caller’s hinge was rated for 200,000; it managed a squeak, not a failure).
Finish systems that shrug off a decade of hands. The British Woodworking Federation speaks for the manufacturing trade’s standards, FIRA does the testing that separates durable from merely photogenic — and the honest news is that the price gap between the ends of this market is real, while the longevity gap is measured in decades.
Cheap fitted furniture is the most expensive kind. It just invoices you later.
Two local footnotes. Marylebone’s mansion flats and terraces often can’t add storage anywhere else, so the new room ends up carrying the whole household’s order — a quota worth setting generously on day one. And Westminster’s conservation officers, so attentive to everything outside, have no opinion whatsoever about your cupboards. No consent, no committee. Indoors, you’re free.
An unfitted extension is a room. A joinery-first extension is a system that happens to be beautiful — and in a postcode where every square metre answers for itself, we know which one we’d draw.
The squeak, for the record, was the pantry door. She’d opened it eleven thousand times.
FAQ
Services
We offer a comprehensive suite of architectural services for Marylebone, our skilled architects each specialise in distinct disciplines. This diversity allows us to tailor our approach to meet the various facets of architectural design.