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Loft Conversion Companies in Portsmouth

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Some of our top rated loft conversion companies in Portsmouth

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  • Loft Conversion Company in Portsmouth

    I'm a carpenter with 17 years of experience doing all carpentry. Been doing a lot of cut roofs,truss roofs and flat roofs! There's not a job to big for me, have a great set of lads which are amazing carpenters.get the job done quick and on point.

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  • Loft Conversion Company in Portsmouth

    WJB Carpentry specialise in first and second fix carpentry works. I cover all aspects of internal and external wood works. I am based on the south coast and provide a clean and tidy work environment. I work on new builds but mainly domestic homes from the odd small jobs to extensions and whole renovations.

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  • Loft Conversion Company in Portsmouth

    With over 40 years of hands-on experience in the building industry, we've worked on a wide range of residential and commercial projects—from home extensions and loft conversions to kitchen renovations, patios, and roofing. My background includes both managing and executing jobs to the highest standard, always focusing on quality craftsmanship and customer satisfaction. Based in Waterlooville we proudly serve customers across this area and surrounding regions. Whether it’s a garden room in the suburbs or a full renovation in a nearby town, no distance is too far for the right project. Special Skills Expert brickwork, extensions, and structural alterations High-quality kitchen and bathroom installations Garden rooms and loft conversions with bespoke finishes Skilled in patios, composite decking, and outdoor improvements Roofing, cladding, window fitting, and orangeries Reliable in insurance work, repairs, and project management Strong attention to detail, problem-solving, and customer service We believe in doing the job right the first time—no shortcuts, no compromises. Our philosophy is built on honesty, reliability, and pride in our work. Every project, big or small, gets the same level of dedication and care.

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  • Loft Conversion Company in Portsmouth

    We are a team of experienced and talented kitchen fitters, carpenters and joiners based in Petersfield, Hampshire with over 10 years of fully qualified experience. Offering a bespoke, friendly and professional service in respect of both Residential and Commercial Carpentry including kitchen fitting & design and 1st & 2nd fix carpentry work. We bring a vast amount of experience and workmanship our projects and work on a wide range of both commercial and residential projects.

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  • Loft Conversion Company in Portsmouth

    As a small business Architectural business specialising in residential extensions, we pride ourselves on our friendly, professional and experienced service. We offer all of our potential clients a free, no obligation consultation service where your ideas for your extension, loft conversion, garage/barn conversion or one off new build, can be discussed from the comfort of your own home, enabling you to ask any questions you may have. We handle all aspects of this process, from the measured survey, to the planning permission/permitted development stage and from there on, the building regulation package. We take the hassle out of the entire process, so you can relax knowing your project is within very capable and experienced hands. Here is a summary of the services we offer you: - Measured survey of your property.- A detailed design process.- Your planning drawings for your extension, loft conversion, garage/barn conversion or one off new build.- Putting your plans through the Local Authority on your behalf, and liaising with them throughout this process.- Building Regulation drawings.- Obtaining quotations from Structural Engineers and Building Control professionals, on your behalf.- Submission of the Building Regulation drawing

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  • Loft Conversion Company in Portsmouth

    Hi we are very reliable and honest. We have over 15 years experience in plastering, rendering, we are fully qualified silicone rendering installers phone for a free quote.

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  • Loft Conversion Company in Portsmouth

    Your friendly local carpenter, specialist in all aspects of carpentry.

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  • Loft Conversion Company in Portsmouth

    We are an established local builder , we specialise in new builds , extensions and loft conversions New to my builder , however many years of experience under our belts , competent , reliable builder with great knowledge of our industry

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  • Loft Conversion Company in Portsmouth

    At all seasons builders and roofers we are a family run company. With a passion for bespoke loft conversions extensions and landscaping. Inspired by traditional craftsmanship. We cut every roof by hand. Ensuring a truly tailored finish. Friendly,reliable,and always on hand with expert advice. We bring dedication to every structural or planning challenge. Let us help you transform your home

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  • Loft Conversion Company in Portsmouth

    Hi my name is Kev, i have been in the building trade for over 40 years l hold City & Guilds in carpentry and joinery. Over the years l have done lots of renovations, loft conversions and new builds no job is to big l’m happy to come and discuss any projects and show you my portfolio.

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  • Loft Conversion Company in Portsmouth

    JB Steel and Construction is a Waterlooville based construction company that take great pride in working closely with clients to achieve their dreams at the most cost effective way and in a realistic time scale, we win 80% of our work on reputation which really means alot to us as a company, we make sure all work is completed above and beyond standards. please do look at our gallery for some of our previous works for ideas.

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  • Loft Conversion Company in Portsmouth

    IBuild West Sussex Ltd ( Formerly IBuild Construction ) are a dedicated team of builders that can design & build your dreams & bring them to life. New builds,extensions,loft conversions & all internal/external work for renovation & restoration. We can design & build to whatever your budget allows.We have a wealth of knowledge & the love for the build to share our ideas & come up with solutions when needed. We are here to help all the way from start to finish & have all the trusted trades under one roof with decades of experience.

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  • Loft Conversion Company in Portsmouth

    At CW Roofing Ltd, we provide high-quality roofing services you can rely on. With over 15 years of experience, we specialise in all aspects of roofing work, including reroofs, roof repairs, fascias, soffits & guttering, and cladding. We pride ourselves on delivering professional workmanship, honest service, and durable results built to last. Whether you need a small repair or a complete new roof, our fully insured team is here to help with friendly advice and free quotations.

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  • Loft Conversion Company in Portsmouth

    We cover all aspects of Carpentry works, extensions and building works, including extensions and renovations.

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  • Loft Conversion Company in Portsmouth

    Clean, reliable, fair and easygoing, great plasterer with 15 years experience

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  • Loft Conversion Company in Portsmouth

    Hi everyone, I’m a carpenter based in Chichester. Happy to travel. We take on all aspects of carpentry works and also landscaping, before training as a carpenter I had a landscaping business doing fencing, deckings etc so happy to take on those landscaping jobs too👍 follow us on Instagram Facebook and tiktok to see our work: @jpwcarpentry

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5

Top rated Loft Conversion Companies

Our Loft Conversion Companies in Portsmouth, are rated 5 out of 5 based on 1 review from customers like you.

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What services are offered by loft conversion companies in Portsmouth?

Converting a loft often entails many jobs - some of which you likely haven’t even considered! Fortunately, a professional loft conversion company in Portsmouth will be able to handle multiple services, ensuring your transformed loft is fit for purpose.

Some of the services loft conversion companies can provide include:

  • Full loft conversions: Complete design and build projects when structural alterations are needed

  • Dormer loft conversions: Add extra headroom and floor space with a dormer extension

  • Velux or rooflight conversions: Ideal for lofts with good existing height; minimal structural change required

  • Hip-to-gable conversions: Extend the sloped roof to create more usable space

  • Mansard conversions: A major structural change offering maximum space.

  • Loft storage conversions: Add flooring, lighting, and insulation for clean, usable storage

  • Skylight or roof window fitting: Install natural light solutions like Velux windows

  • Staircase installation: Design and build bespoke stair access to your new loft

  • Insulation, heating, and ventilation upgrades: Ensure comfort and compliance with energy standards

  • Design and planning services: Architectural drawings, planning permission, and building regulation approval

Post your job to MyBuilder and you'll be matched with loft conversion companies in Portsmouth who are interested and available to help. And with the reviews of past customers and the freedom to compare the quotes of similar tradespeople, all in the same place, the ball’s in your court.

Average costs of loft conversion companies in Portsmouth

Loft conversions tend to be charged on a project basis, rather than by the hour, as they often involve weeks or even months of work.

The cost of your loft conversion depends on a few things, including the style of loft conversion and materials you choose and the size of your property.

That being said, here are average prices for common types of conversion work:

  • Full loft conversions: £45,000–£70,000+
  • Dormer loft conversions: £55,000–£85,000+
  • Velux or rooflight conversions: £25,000–£45,000
  • Hip-to-gable conversions: £50,000–£80,000+
  • Mansard conversions: £70,000–£100,000+
  • Loft storage conversions: £10,000–£20,000
  • Roof window fitting or skylight installation costs: £1,000–£2,500 per window
  • Staircase installation costs: £2,000–£5,000
  • Insulation, heating, and ventilation upgrades: £2,000–£6,000
  • Design and planning services: £1,500–£4,000

Take a look at our guide to loft conversion costs to get a more detailed breakdown of the different options available when using a Portsmouth loft conversion company.

Find a loft conversion company in Portsmouth with MyBuilder

When you’re planning major work like a loft conversion, you’ll want to find the right tradesperson for the job. The great news is, MyBuilder has already done all the time-consuming work for you.

All you need to do is post your job on MyBuilder, completely for free, and we’ll share it with loft conversion companies near you in and around Portsmouth.

Step 1: Post your job on MyBuilder

Provide a detailed description of your loft conversion project, including the type of conversion you want, any structural changes, preferred materials, and your ideal timeline. Once posted, local loft conversion companies in Portsmouth can view your job and register their interest.

Step 2: Review and compare Portsmouth loft conversion companies

Browse the profiles of interested loft conversion companies. On MyBuilder, you can view photos of previous projects alongside customer reviews, compare quotes, and see the types of conversions they specialise in.

Step 3: Contact and discuss your project

Once you’ve reviewed local Portsmouth loft conversion companies, you can reach out to those that interest you to ask questions, clarify details, and request more specific quotes. At this stage, be sure to discuss vital aspects like planning permission, design options, and estimated timelines to ensure the company meets your requirements.

Step 4: Hire the right Portsmouth loft conversion company

Once you’re satisfied with their experience, quotes, and approach, you can confirm your hire and start planning your loft conversion.

You can also take a look at our loft conversion specialist hiring guide to help inform your choice. All tradespeople undergo checks at registration - such as verifying ID documents, company details, and certifications for regulated jobs and doing skill assessments - allowing you to hire with confidence.

Questions to ask local loft conversion companies in Portsmouth

Choosing the right loft conversion company for your job requires finding someone who understands your home and your goals.

Find out which company can share your vision by asking the following questions:

What experience do you have with loft conversions in Portsmouth?

A local loft conversion company in Portsmouth will know the types of properties and building styles common in your area, as well as the planning and building regulations that apply. Ask about similar projects they’ve completed locally.

Are you insured, and do you offer a warranty for your work?

Insurance protects your home during the loft conversion process, while a warranty shows the company’s confidence in the quality and durability of their work.

How do you handle planning permission and building regulations?

Established loft conversion companies in Portsmouth should understand local planning rules and building regulations. Ask how they’ll manage permissions, inspections, and compliance to avoid delays or legal issues.

What is included in your quote?

Ensure the quote covers all essential aspects of the loft conversion: structural work, windows or skylights, staircases, insulation, labour, and any additional fees. Understanding this upfront prevents unexpected costs later.

Do you manage the project from start to finish?

Some Portsmouth loft conversion companies offer full project management, coordinating architects, builders, and tradespeople. Others may only handle part of the conversion. Clarifying this early on helps you understand what support to expect.

FAQ: Common questions about loft conversions in Portsmouth

How long does a loft conversion take?

Typically, a loft conversion can take between 6 and 12 weeks, depending on complexity, planning permissions, and any structural work required. Be sure to discuss the timeline with any potential loft conversion companies in Portsmouth before agreeing to start the work.

Do I need planning permission for a loft conversion in Portsmouth?

Many loft conversions fall under permitted development, but some require planning permission, especially if you’re adding a dormer, extending the roof, or living in a listed building. A professional Portsmouth loft conversion company can advise and handle permissions for you.

Will a loft conversion affect my home insurance?

Yes, you’ll need to update your home insurance to cover the conversion. Inform your provider about structural changes, additional rooms, and any changes to utilities or heating systems.

Can I stay in my home during the loft conversion?

Many loft conversions allow you to remain in your home, though noise and dust are inevitable. Some Portsmouth loft conversion companies offer strategies to minimise disruption, but in complex projects, temporary relocation may be advisable.

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