Want to upgrade your old house with a modern extension? We got you. Whether you’re planning an extension or a loft conversion in Worthing, every renovation comes with challenges. Ideas are so alluring; converting them into reality is the real struggle.
That’s why we have designed this practical guide on modern extension, including practical planning steps, the best ideas, benefits, and last but not least, the cost of contemporary extension in Worthing. So, by the end of this article, you’ll have a complete roadmap to bring your extension ideas into reality with expert support.
How To Add a Modern Extension to An Old House?

Adding a new extension to an old home can give a new life to your existing home, without relocating. It also increases your home value and provides greater functionality, especially when planned by experienced builders in Worthing, West Sussex.
But remember, whenever you’re thinking of renovation, planning is the first step. Here are some practical steps that can help you plan your modern extension with a strategic approach:
- Assess Your Existing Home:
Evaluate the structural strength, architectural style, and unique character of your home. You may also consult professionals offering property extension services in Sussex to assess the foundation, load-bearing walls, and overall condition before design.
This assessment can help you to understand at which place of your home you can add an extension and with which design.
- Set Clear Goals and Budget:
Clearly understand your why. Are you building this extension for a home office, or dreaming of a bigger kitchen? Reviewing small terraced house extension ideas and rear extension semi-detached house examples can inspire you while setting goals and budgets. But on average, the cost of modern extension on old homes in Worthing is £2,200 to £3,300 per square meter.
Remember, this cost is exclusive of tax. Also, the complexity and final finishes can add up to the actual cost.
- Understand Building Regulations
It’s very important to understand UK Building Regulations and keep your extension compliant to avoid penalties. If your plan includes a loft, review the loft conversion building regs to stay fully compliant before construction starts.
The purpose of Building Regulations is to ensure the safety of all residents and the area, ensuring that electricity, plumbing, insulation, and structure are in accordance with regulations.
- Choose the Right Professionals
Adding modern extensions isn’t a DIY project. The professional can help you from planning to execution, saving your time, money, and making your process stress-free.
Sussex County Construction has been serving Worthing homes for years, known for their Bespoke House Extensions in Sussex and Expert Building Services in Worthing. We know the environment, the best materials for coastal homes, and build modern extensions that transform your property.
Best Ideas For Modern Extensions on Old Houses in Worthing:

- Modern Farmhouse Extension:
These extensions are also known as “glass box” extensions. They are often paired with Bespoke Garden Rooms in Sussex or outdoor kitchens, using lightweight metal and glazed sliding doors to create beautiful panoramic views. It offers panoramic views of the rural surroundings.
- Arts and Crafts House Extension:
It’s a beautiful brick and timber ground-floor extension with a timber staircase, bay windows, and fireplaces in the house. The best part of this extension is a striking 3mm wide “bay” window combining oak beams and an Accoya bi-fold window.
- Maissonate Extension:
The Maissonette extension is the best option if you want views out over your garden. It’s also the most suitable extension choice for limited space, offering a creative roof structure resembling the ribs of the boat.
- A1930 Home Extension Idea:
If you have an old 1930s semi-detached home, a modest rear extension is the best option. It offers extra space for a growing family’s needs within an affordable range.
- A Flat Roof Extension:
A floor-roof extension is the best option if you want a large kitchen facing a lush green garden.
- The Accessible Extension:
It has a convenient self-supporting roof with a timber diagrid design, forming a continuous canopy over the internal space and the external terrace, A concept also used in Bespoke New Builds and contemporary homes in Sussex.
- A Georgian House Extension:
You can add a modern extension to your existing Georgian home with a zinc roof and plenty of high-performance glazing. It matches the structure of the original house and keeps the harmony.
- Timber Extension on Brick House:
A brick house with a timber extension gives a modern and natural look. The design smoothly harmonizes with the existing without overpowering.
- The Side Return Extension Reinvented:
This addition is best suited to infill the unused land lying between the existing house and the adjoining block of flats.
- Modern Victorian House Extension:
In this type, the roof of the extension is pitched enough to reflect the pitch of the original home. The corners of the extension are cantilevered.
- Corten Steel Extension:
Best modern extension option for conservative areas. It has a 40mm thick steel frame with four large panes of glass, two of which are sliced back to open the kitchen and living space.
- Coastal-Inspired Sunroom Extension:
This extension is best for a Worthing coastal home. Big windows and light colors allow the sea breeze and the sunshine to make your home airy and bright.
- The Invisible Extension:
It’s the best option if you want the extension to seem like the original part of your home. The extension has brick cladding that clearly incorporates into the oversized linear lintel, framing the large expanse of sliding doors.
- Glass Link Extension:
It’s a small glass corridor that connects the old home with the new extension. A great source of natural light, giving a modern touch, similar to what Professional Loft Conversion Services Across the UK achieve in upper-level designs. For homes in Worthing, this design gives an airy and bright look.
- Rendered Extension on Brick House:
The rendered extension gives your brick home a smooth and contemporary touch. You get plenty of paint options, making the overall look cohesive.
How to Harmonise Modern Extension with Your Existing Home?
Once you decide why you need a modern extension, what’s your budget, and what type of extension suits you best, the next step is harmonizing. Harmonise your modern extension with your existing home. Here are some tips that can help in this synchronization:
- Material Selection:
The right material selection creates a cohesive look between your modern extension and your old house. For inspiration, check New Builds and Renovations in Brighton that combine traditional brickwork with sleek modern materials beautifully. This visual link beautifully creates harmony. Similarly, modern materials also complement existing structures.
- Color Palette:
Unify the old and the new. Your color choices can harmonize or create a mess between the old and the new parts. Generally, one neutral palette in extension complements the colors of old structures. For example, if your existing home has warm tones, use cool grey or whites in the extension for a beautiful contrast.
- Flooring:
Flooring creates harmony between the old and the new extension. If possible, use the same flooring material across the home. If not, try using complementary materials. For example, if your existing room has a hardwood floor, use large-format tiles in the new extension. But choose in the same tone, so both floors stay the same.
- Lighting:
Lightning is an important element, the factor that connects both the old and the next extension with the same amount of light and feel. To create continuity or flow, it’s best to create similar lighting or fixtures in both areas.
- Architectural Detail:
In your new extension, add some architectural elements of your existing home, such as cornices, skirting boards, or window frames. If your existing home has Victorian-style ornate features, using them in a simplified version extension gives an elegant touch.
- Transitional Spaces:
A transitional area between the modern extension and the existing home creates a smooth contrast. It can be a glass corridor, a courtyard, or an elegant hallway.
Benefits of Modern Extensions on Old Houses:

Adding an extension to your old home is highly beneficial. You gain a flexible living space without relocating and increase property value. Many clients combine extensions with kitchen renovation services in West Sussex for a complete transformation.
Here are some benefits of adding an extension to old homes.
- The biggest feature of modern extension is big windows and glass walls, a great source of natural light that makes the space open, airy, and bright. Natural light reduces eye strain, increases productivity, and improves mental well-being overall.
- Open plan layouts, a new work-from-home office, study room, an open plan kitchen, or whatever you intend to use your extension for. The extension helps you use a space in your home more efficiently without shifting.
- Modern extensions give an edge to make your home environment-friendly and energy-efficient. Use materials and systems that reduce environmental impact and bills. For example, consider solar-powered systems for heating or cooling.
What’s the Cost of a Modern Extension on an Old House in Worthing?
The cost typically ranges from £2,200 to £3,300 per square metre. The final price depends on size, complexity, and material, similar to the factors influencing how much a loft extension costs across the UK.
What’s the Time Required for a Modern Extension on an Old House in Worthing?
As we discussed before, the first step in adding modern extensions is planning. From planning to setting goals, finalizing the budget, and understanding building regulations, the time required is 1-3 months. Once these basic things are finalized, the time for the actual conduction phase is 3-6 months.
What’s the Best Time for Adding an Extension to Existing Homes in Worthing?
The most suitable time for adding an extension to existing homes in Worthing is Spring, from March to May. It’s because, in this season, the weather is moderate and easily manageable. Also, there are more options to get experienced builders compared to Summer, because in summer, from June to August, the weather is dry and the days are long, and it’s the peak construction season. So, you might have to face more fees and long delays.
Best Contemporary Extensions to Old House Builders in Worthing:
Sussex County Construction is the most trusted building company in Chichester and across West Sussex, converting dreams into reality with perfection. From planning to completion, we’re among the Best Home Builders Near You.
Partner with us for your extension project and see your home renovated without stress.
FAQs:
Which type of house extension is most popular in Worthing?
Brick-built side and rear extensions are the most popular extension types in Worthing. It’s because the homes here are old Victorian style that matches perfectly with the brick wood.
Does a Flat Roof Extension Remain Safe in the Rainy Season of Worthing?
Yes. If you use a high-quality waterproof layer with a proper drainage system, the flat roof extension remains completely safe in Worthing.
Does adding an extension require planning permission in Worthing?
Not always, but if adding an extension requires major structural changes or your home is in a conservative area, then yes, you require planning permission. Our experts in Professional Construction Services in Bognor can guide you through all legal and design requirements. And it’s always wise to take an expert opinion from local experienced builders to stay safe legally.

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