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Loft Conversion Companies in Portsmouth

Easily find verified Portsmouth Loft Conversion Companies. Just post your job to get quotes from MyBuilder's 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

    Hail & Stone Construction Limited specialise in delivering high‑quality and high-end building and construction services that stand the test of time. With a strong reputation for reliability, craftsmanship and attention to detail, we work closely with our clients to bring their vision to life – on time and on budget. From initial design and planning through to completion, our experience enables us to manage projects of all sizes, including new builds, extensions, renovations and commercial fit‑outs. Whether you are a homeowner, developer or business owner, we provide a professional and transparent service, clear communication at every stage, and a commitment to exceptional results.

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  • Loft Conversion Company in Portsmouth

    Timber enthusiast. An extra 5 minutes of care is a life time in your home. 15years of working in and around carpentry and building. Working with all ranges of timber from Oak to tulipwood. We pride ourselves on good quality work, being neat and professional. Clean and accurate.

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  • Loft Conversion Company in Portsmouth

    We're a growing carpentry company with vast experience of all types of carpentry. All aspects of our work are completed to the highest standards.

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  • Loft Conversion Company in Portsmouth

    CJ bespoke improvements is an experienced buisness, and we have many years combined in the trade. We have back grounds in carpentry, plumbing, plastering, decorating and general building work. Our company aim is to provide excellent customer service and excellent results in our work. We are an established and respected local company, looking to uphold our reputation.

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  • Loft Conversion Company in Portsmouth

    Need a Loft Conversion Specialist based in Southsea or nearby? projectsupreme ltd can help you. We pride ourselves on the quality work that we deliver to each and every client. Contact us to talk about your job and get a quote.

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  • Loft Conversion Company in Portsmouth

    My name is Mark from MJPBuilding. I have been in the building industry all my working life. I have undertaken many different projects from plastering small walls to renovation, restoration and building extensions from start to finish. I am clean, tidy, punctual and friendly. Many thanks for looking at my profile. Free no obligation quotes given.

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  • Loft Conversion Company in Portsmouth

    Hi, my name is Phil, myself and my wife have run a property development company for over 20 years and have constructed and extended many types of properties and have therefore gained a fairly comprehensive skill set, we have also built up a large number of trusted contractors who work alongside us on projects. We have decided to slow down a bit now, but still need something to keep us busy, so are concentrating on domestic extensions/alterations and conversions. We appreciate that engaging and bringing a builder into your home can be a daunting process, so we pride ourselves on not being your general Bob the builder, but people you can talk to, that understand your requirements and try to deliver them with as little stress and inconvenience as possible.

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  • Loft Conversion Company in Portsmouth

    Hello, I’m Rob from farr homes, I’m a carpenter by trade but have been involved with mid-high end full new builds,extensions,refurbishments for the last 17 years now. I am extremely fussy with my attention to detail and customer service, I really enjoy what I do & I will treat your project as if it was my own. We have trades to cover all of your building works needs.

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  • Loft Conversion Company in Portsmouth

    My interests and skills are focused towards residential/domestic properties, having over 10 years experience within the carpentry and roofing sector. Whether it’s first/second fix carpentry or flat roofing projects, I hold valuable experience and skills to achieve the desired outcome for your next project. Kitchen installations, skirting/architrave, doors, LVT and engineered wood flooring, EPDM flat roofing, fascias, guttering, cladding, garden decking are just some of the works undertaken.

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  • Loft Conversion Company in Portsmouth

    Friendly and competent carpenter/builder with plumbing and electrical contacts if required. Willing and able to undertake the following types of work, All aspects of carpentry Roofing tiling/ batoning Tacking/dot and dab Boxing External cladding. Garage conversions Loft conversions Timber frame

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  • Loft Conversion Company in Portsmouth

    Here at JM carpentry and building, we provide high quality building work from highly experienced tradespeople that have been in the trade for almost 20 years. Our vast skill sets range anywhere from fitting your brand new kitchen to completely renovating your home. We are a friendly team that take pride in our work with exceptional attention to detail. We cover all of Hampshire and surrounding areas.

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  • Loft Conversion Company in Portsmouth

    Electrical & building contractor established 2011, fully Insured & registered with niceic, covering all aspects of electrical works & building works

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  • Loft Conversion Company in Portsmouth

    Are you looking for a way to transform your home into a luxurious living space? Our loft conversion company in Portsmouth can help you achieve the ultimate living experience with our top-notch loft conversions. Our team of experts will work closely with you to design a bespoke loft conversion that meets your needs and exceeds your expectations.

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  • Loft Conversion Company in Portsmouth

    specialists in kitchen fitting and customised Interiors like bedrooms,living rooms and dining rooms With 25 yrs experience in all aspects of 1st and 2nd fix Carpentry we do everything from full kitchen refurbishments to custom made wardrobes,bay window seating and storage to various wall panelling designs and decking

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  • Loft Conversion Company in Portsmouth

    Mundey construction specialise in property restoration & landscaping

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  • Loft Conversion Company in Portsmouth

    Welcome to Made4UDevelopments Ltd Based in Hampshire, Made4UDevelopments Ltd specialises in high-quality extensions, refurbishments, renovations, and property improvements across Hampshire and the surrounding areas. We take pride in delivering reliable workmanship, professional project management, and attention to detail from start to finish. Whether you are planning a home extension, full refurbishment, structural alterations, or exterior improvements, we work closely with our clients to ensure every project is completed to a high standard. Our goal is simple — to provide honest, dependable building services with quality results that stand the test of time. From initial planning through to completion, we are committed to creating spaces that are practical, modern, and built around our clients’ needs.

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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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