Loft Conversions in Hampshire

Local Contractors | 10+ Years Experience | 5-Star Rated | Federation of Master Builders Approved

Why Choose Syze Developments?

Professional Affiliations

Every Syze Developments contract is approved by the Federation of Master Builders which means fixed prices, clear timelines and quality standards you can hold us to.

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Federation Of Master Builders
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Can my loft be converted?

The good news is yes – probably. Some lofts are more suitable for conversion than others, with head height, roof pitch and type of roof structure determining how tricky the conversion might be. But, as shown below – there are many different approaches giving lots of possibilities.

Skylight Loft Conversion

Skylight conversions are ideal for homes with ample attic space and require minimal alteration to be functional. Windows are installed directly into the slope of the roof, bringing light and ventilation. Ceiling timbers need to be reinforced to make them suitable for flooring.

UnconvertedSkylights

Dormer Loft Conversion

Dormers are very popular as they provide significant additional floorspace and headroom while being simple to construct. The box-like dormer protrudes from the roof, and their vertical windows feel very natural from inside. They are constructed within the existing roof width.

UnconvertedDormer

Mansard Loft Conversion

A Mansard conversion offers the maximum amount of space for a loft conversion, reaching all the way to each boundary wall or gable end. Significant changes to the roof are required – but the result is timelessly stylish, characterised by a 72 degree slope on the roofline.

UnconvertedMansard

Hip To Gable Loft Conversion

In this conversion, the slanted (or ‘hipped’) end of a roof is made vertical – recovering otherwise wasted space. Further modifications are then applied to the new profile, resulting in a significant gain in head height and floorspace for bungalows, end-of-terrace and detached homes.

SkylightsHipped Roof
Loft extension built over garage

Loft extension built over garage

Plastering in large dormer conversion

Plastering in large dormer conversion

Full width dormer conversion

Full width dormer conversion

Dormer Conversion

Dormer Conversion

'Tin Hat' weatherproofing

‘Tin Hat’ weatherproofing

More space for growing needs

As families grow, homes can quickly feel cramped and insufficient. A loft conversion can seamlessly transform wasted space into an extra bedroom and bathroom.

Typically, it’s one of the highest-return investments in home development – easily accommodating your evolving family needs while avoiding the hassle and expense of moving house.

Our Approach To Loft Conversions

A big project can be daunting – we aim to make it as transparent and predictable as any other service.

Consultation

Understanding your vision comes first. However far you’ve got with planning, we’ll work with you to arrive at a solution that meets your needs and satisfies all necessary regulations. Our long experience frequently helps to add clarity or suggest innovative features for your living space.

Budgeting

Once the design is established, we produce a detailed report showing the cost of materials, labour, permits and other associated expenses. This transparent cost breakdown makes it easy to understand the full scope of the project – allowing you to identify cost-saving opportunities.

Construction

Loft conversions have special considerations: as well as scaffolding and weather proofing, crane access may be required to position steelwork. Site safety is rigorously maintained and work is planned around your daily activity, ensuring your satisfaction throughout the build.

Frequently Asked Questions

Most loft conversions fall under Permitted Development, so you often don’t need planning permission but dormer and hip-to-gable conversions on certain road-facing elevations may need it. We can help to guide you on this as part of our process.

A simple loft conversion with Velux windows can cost as little £30,000 – whereas a complete high-end rebuild of the upper storey of a house may cost £130,000.

Duration depends on the type of conversion. A Velux conversion typically takes 6–8 weeks, a dormer 8–10 weeks, and more complex builds 12–16 weeks. Most of our customers stay in their homes throughout, work is largely contained to the roof and upper floor, so day-to-day life isn’t as disrupted as people expect. We’ll give you a clear project timeline before work starts, so you always know what’s happening and when.

We can typically schedule a start date within 6–8 weeks of signing contracts, and always within 12 weeks. We’re a local Hampshire-based team, so we’re not juggling projects across the country, if you’re ready to move, we can usually move quickly. We’ll also work around your family’s schedule where possible, so the timing works for you, not just us.

If your home is semi-detached or terraced, you’ll likely need a party wall agreement before work begins. This is a legal requirement under the Party Wall Act and protects both you and your neighbours. It sounds more complicated than it is — we’ll advise you on exactly what’s needed during consultation and can point you to a local surveyor if required.

Yes, and the vast majority of our customers do. Work is largely contained to the roof and upper floor, so the rest of your home remains liveable throughout. We keep the site clean and tidy at the end of each working day and will always give you advance notice of anything that might cause more disruption than usual, such as structural work or skip deliveries.

The minimum recommended head height is 2.2m measured from the floor joists to the ridge of the roof. If you’re below this, a conversion isn’t impossible, options like a dormer or mansard can create additional height but it does affect what’s achievable and the cost. We’ll measure up during your free visit and be straight with you about what’s realistic.

Yes. We’re members of the Federation of Master Builders and carry full public liability and employer’s liability insurance. Our FMB-approved contracts also give you built-in protections around costs, timelines and quality standards, something not all local builders can offer.

Absolutely! we’re proud of our work and happy to share it. You can browse our work online, and during your consultation we can show you projects we’ve completed in Hampshire and the surrounding area. We can also connect you with previous customers who are happy to talk about their experience if that would help.

Case Studies

We’re proud of the work we do and are happy to show projects we’ve completed for our clients.

Garden Connected Extension2026-02-02T06:39:53+00:00
Garden Connected Extension
Garden Connected Extension

Garden Connected Extension

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Extension And Kitchen Remodel2026-01-22T02:47:44+00:00
Extension And Kitchen Remodel
Extension And Kitchen Remodel

Extension And Kitchen Remodel

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West Meon two storey modern extension2025-08-11T13:57:41+01:00
West Meon two storey extension
West Meon two storey modern extension

West Meon two storey modern extension

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Two Storey Wrap-Around Extension Waterlooville2024-12-29T02:53:44+00:00
Waterlooville two storey extension
Two Storey Wrap-Around Extension Waterlooville

Two Storey Wrap-Around Extension Waterlooville

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Wrap-Around Extension in Petersfield2024-12-29T02:54:19+00:00
Petersfield wrap-around extension
Wrap-Around Extension in Petersfield

Wrap-Around Extension in Petersfield

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What happens next?

Ready to take the next step? We offer a free, no-obligation home consultation to discuss your ideas. Whether you have detailed plans or just a rough sketch, we’ll provide expert guidance to help you move forward with confidence.

Fill out the form at the top of this page to get started—we’d love to hear about your project!

Why choose Syze Developments to build your extension

Bringing Your Vision to Life

Your home is more than just a space—it’s a reflection of your lifestyle and aspirations. That’s why we take the time to understand your vision and create a tailored plan with meticulous attention to detail.

With various design and finish options, you’ll make informed decisions at every step. Our skilled tradesmen ensure exceptional craftsmanship, and our Federation of Master Builders-approved contract guarantees transparency, so no unexpected costs once the budget is set.

What sets us apart is our open communication and seamless, stress-free experience — you can enjoy the journey as much as the final result.