How to Plan a Seamless Home Extension: Design, Budgeting & Contractor Insights
- Daniel Nikolla
- May 14
- 7 min read
Discover what makes a stress-free home extension possible with advice from LXM’s experienced London-based team.
Expanding your living space through a home extension can be a transformative experience—both functionally and aesthetically. Whether you're dreaming of a new kitchen-dining area, an extra bedroom, or a bespoke open-plan family zone, a well-planned extension can dramatically improve how you live. But to achieve a seamless result, you need the right design strategy, a realistic budget, and a contractor who understands your goals from the ground up.
At LXM Building Services, we bring decades of experience in high-end residential extensions, delivering tailored solutions for homeowners across London. From our base in North London, we support clients in areas like Notting Hill, Kensington, Barnet, Epping, and beyond.
This guide explores how to plan, design, and execute your extension project smoothly—covering cost considerations, layout decisions, and expert contractor tips for 2024.
Why Consider a Home Extension?
A home extension is one of the most effective ways to increase your property’s space, value and comfort without the upheaval of moving.
Benefits include:
Extra Functional Space – Ideal for growing families or remote working setups
Improved Layout & Flow – Create the open-plan lifestyle you’ve always wanted
Enhanced Property Value – Well-designed extensions often add 10-20% to home value
Design Freedom – From glass box rear extensions to traditional side returns, you can personalise your home
At LXM, we offer a full design-and-build service that manages everything from feasibility and layout planning to finishes and compliance.
Popular Types of Home Extensions
Rear Extensions
Perfect for properties with generous gardens, these extend outwards from the back of your house.
Side Return Extensions
Ideal for Victorian and Edwardian terraces in areas like Barnet or Kensington, these fill in the often-unused alleyway to the side.
Wraparound Extensions
A combination of rear and side return, offering maximum additional space and design flexibility.
Double-Storey Extensions
Extend vertically to add upstairs bedrooms or bathrooms alongside ground-floor living areas.
Loft Conversions
One of the most cost-efficient ways to add space—ideal for master suites, offices or guest rooms.
Thinking About a Loft Conversion?
LXM offers tailored loft conversion services including dormer, mansard, hip-to-gable, and Velux options—all designed to enhance space, light and long-term value.
Discover everything you need to know in our latest blog:“Loft Conversions in London: Costs, Storage Ideas & Design Tips for 2025" From planning and pricing to smart storage solutions and the latest design trends, this guide will help you make the most of your loft space. Whether you're in Notting Hill, Barnet, Kensington or beyond, we cover what to consider before you begin.
Planning & Design: What to Consider
A successful extension begins with a thoughtful design. Our in-house and partner architects work closely with clients to shape layouts that enhance day-to-day living. Here’s what to consider:
Purpose of the Extension – Extra bedroom, kitchen-diner, home office?
Daylight Access – Consider bi-fold doors, roof lanterns, skylights
Structural Feasibility – Site conditions, existing walls, support requirements
Planning Restrictions – Conservation areas, party walls, setbacks
Material Continuity – Should it match or contrast your existing property?
We take the stress out of planning by managing everything—from building regulations to permitted development rules and planning permission where needed.
Budgeting: What to Expect in 2024
Costs can vary depending on size, complexity, and specifications. On average:
Single-storey rear extension: £2,500–£3,500 per m²
Double-storey extension: £3,000–£4,500 per m²
Side return extension: £50,000–£80,000
Wraparound extension: £80,000–£120,000+
Loft conversion (dormer): £35,000–£55,000
These prices typically include design, groundwork, structural elements, electrics, plumbing, finishes, and project management. At LXM, we provide transparent quotes with no hidden fees, detailed timelines, and regular progress updates.
Our Accreditations: Built on Trust and Safety
At LXM Building Services, we take pride in maintaining the highest standards across all our projects. Our certifications reflect our commitment to safety, compliance, and industry-best practices:
CHAS Accredited Contractor – Recognised for excellence in health & safety compliance.
Constructionline Gold Member – Meeting robust procurement and risk management standards.
NICEIC Approved Contractor – Certified for electrical safety and regulatory compliance.
Gas Safe Registered – Fully authorised to carry out safe gas work across residential and commercial properties.
These accreditations give our clients peace of mind—knowing that every project is delivered by qualified professionals who care about doing things properly.
Interior Ideas: Maximising Space & Light in Your Extension
A well-designed home extension does far more than increase square footage—it should transform how you live, bringing better flow, enhanced functionality, and a renewed connection between spaces. In 2024, the focus is on intelligent design that maximises natural light, storage, and a seamless indoor-outdoor experience. Whether you’re building a rear extension, side return, or wraparound in London, these interior ideas will help you create a space that’s not only beautiful but built to last.
Open-Plan Kitchen-Living Areas with Integrated Dining
The open-plan layout remains a top trend for 2024, especially in urban homes where versatility is key. By combining your kitchen, living, and dining spaces into a single, flowing zone, you create a more sociable, spacious environment. Kitchen islands, built-in banquettes, and breakfast bars help define each area while maintaining connection. Floor-to-ceiling glazing or sliding/folding doors can enhance this further by opening up the space to your garden or patio.
Smart Storage That Blends In
Storage is a major consideration in any home extension, and in 2024, the goal is to integrate it beautifully. Think bespoke cabinetry beneath staircases, under-eaves storage, or built-in banquettes that offer both seating and hidden compartments. These clever solutions help maintain clean lines and clutter-free interiors—ideal for achieving a modern, minimalist feel.
At LXM Building Services, we offer bespoke joinery crafted to suit your space and style, turning awkward corners into elegant storage opportunities.
Natural Materials with Warm, Earthy Tones
Biophilic design continues to influence interiors in 2024, with homeowners leaning into natural textures and earthy palettes. Materials like reclaimed timber, cork flooring, exposed brick, and polished concrete are not only sustainable but bring warmth, character, and a grounded feel to modern extensions. These finishes pair well with both neutral and bold colour schemes, offering timeless appeal.
Minimalist Glazing & Biophilic Connections
One of the most effective ways to maximise light and space is through well-placed glazing. Slim-framed aluminium doors, picture windows, and rooflights allow daylight to flood your interiors, making rooms feel larger and more inviting. Integrating indoor greenery, natural textures, and views of your garden supports a sense of calm and connection with the outdoors—a principle known as biophilic design.
Layered & Zoned Lighting Schemes
Good lighting transforms an interior, especially in multi-functional spaces. In 2024, the trend is toward zoned lighting—using a mix of ambient, task, and accent lighting to create depth and define areas within an open-plan layout. Pendant lights over islands, recessed LED strips under cabinetry, and dimmable wall lights help tailor the mood throughout the day.
Bespoke Interior Finishes by LXM Building Services
At LXM Building Services, we bring your vision to life with bespoke interior finishes that combine practicality with elegance. Our team works closely with you to design interiors that maximise light, enhance space, and reflect your lifestyle—whether you’re extending a Victorian terrace in Notting Hill or modernising a family home in Barnet.
From custom joinery and storage to sustainable materials and glazing, every detail is tailored to your taste and the character of your home.
View Our Work
We take pride in our work and always aim to exceed client expectations. Explore our gallery to see recent driveway installations, paving projects, and full exterior transformations completed by the LXM team.
Choosing the Right Contractor
Your choice of contractor can make or break the project. At LXM Building Services, we offer:
1. Decades of Combined Experience
From our commercial roots to our growing domestic portfolio, we’ve successfully delivered projects across period homes and new builds alike.
2. Quality Without Compromise
From steelwork to high-end finishes, we use only proven materials and techniques, ensuring your extension lasts for years to come.
3. Fully Certified & Insured
Our team includes Gas Safe engineers, NICEIC-certified electricians, and accredited tradespeople. We’re fully insured and compliant with all UK building regulations.
4. Transparent, Professional Service
We believe in honesty and efficiency. You’ll receive detailed estimates, clear schedules, and responsive communication from start to finish.
5. London-Wide Knowledge
We understand the distinct characteristics of London homes—from terrace layouts in Notting Hill to planning constraints in Kensington or Epping.
Navigating Planning Permission & Building Control
Many extensions fall under Permitted Development Rights, especially single-storey rear extensions, loft conversions, or small side returns. However, larger projects or those in conservation areas may require planning permission.
We handle all of this on your behalf:
Preparing architectural drawings
Submitting applications
Managing structural engineering approvals
Liaising with building control officers
Our goal is a smooth, compliant process that keeps your timeline on track.
Ready to transform your home?
Contact LXM Building Services today for a free, no-obligation quote on your London extension project.
Our Process: From Concept to Completion:
At LXM Building Services, we believe that a well-managed process leads to better results—and happier clients. Whether you're planning a loft conversion, extension, or full home renovation, we guide you through every stage with clarity, care, and professionalism.
Step 1: Initial Consultation & Feasibility
We begin by understanding your vision, lifestyle needs, and budget. During this consultation, we assess the structural potential of your property and discuss what’s achievable within local planning guidelines and permitted development rights.
Step 2: Design & Quotation
Working closely with trusted architects and structural engineers, we develop design proposals that align with your goals. Once the design is shaped, we provide a clear, itemised quotation detailing the scope of work, materials, and timeline.
Step 3: Approvals & Scheduling
From securing planning permission and handling party wall agreements to coordinating building regulations and logistics, we manage all necessary approvals. We also finalise the project schedule to ensure a smooth and timely build phase.
Step 4: Build Phase
Our experienced team brings the design to life, managing every aspect of the build—from groundwork and structural alterations to plumbing, electrical work, insulation, and internal finishes. We maintain open communication and a clean, organised site throughout.
Step 5: Handover & Aftercare
Once the build is complete, we carry out final inspections and address any snagging items. We hand over a polished, functional space ready for you to enjoy—along with expert aftercare support for peace of mind.
Ready to Extend Your Home?
Whether you're expanding upward, outward, or reconfiguring internally, LXM Building Services offers expert, high quality contracting solutions tailored to your needs. Our professional team ensures your home extension is stylish, structurally sound, and stress-free.
Get in touch to schedule a consultation and start your journey to a better home.
Join the Team
Are you a skilled tradesperson or experienced contractor? LXM Building Services is always looking for top talent to join our growing team. If you’re passionate about high-quality contracting and delivering first-class results, email us at bricklayingbysean@gmail.com to enquire about our latest opportunities.
LXM Building Services
Specialists in the refurbishment and development of commercial and domestic projects across London
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