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Velux loft conversion uses Velux rooflight windows installed into the pitch of the roof to allow sunlight to flood the newly converted attic. An attic conversion that relies on artificial lighting can feel oppressive; Velux roof windows are specifically designed for maximum daylight and plenty of ventilation whenever you want it. They fit any gradient of roof slope – with windows available for flat roof conversions – and because there’s no visible extension of the loft beyond the existing roofline, there’s no need to worry about planning permission for the loft conversion.

As fully approved Velux window installers, you won’t find anyone better placed to advise you on the perfect products and their ideal positioning for your loft conversion.


A roof dormer window adds living space to a loft conversion with a pitched roof. It’s the exterior part of the conversion; a square or rectangular section construction providing headroom beyond the slope of the ceiling and finished with a vertical window.

Discussing the cost of a dormer window is all part of our initial quotation phase – equally important is the proportion of the dormer conversion against the size of your roof and the width and height of your house. It’s a fine balance getting more floor space and headroom in the attic conversion plans while still maintaining an original and natural appearance from the outside.


A hip to gable loft conversion gives you a much larger living area in the existing loft space. We find a hip-end roof conversion provides enough extra space to accommodate a shower-room and introduce the best staircase positioning, as well as increasing standing space in the loft conversion.

A hip end is the sloping end to a roof. A gable is the triangular section of wall which stands between two sloping roofs. A hip to gable loft extension extends the roof’s ridge line from the existing hips – where the existing upward ridges of the hip end meet the very top of the roof – to the furthest vertical wall.


In the course of any loft conversion planning, the positioning of the staircase is among the most important considerations – it’s a fundamental part of loft conversion design. In most cases we find that the best place to put the attic stairs is above the existing staircase.

By starting at the side of the bedroom door and climbing upwards along the flank wall of the house, no extra space is needed or taken away from the first floor living area to accommodate the new loft staircase. The existing floorplan of your house is usually the defining consideration, but depending on the scale and type of loft conversion, other options may be available, especially if you are considering a hip-to-gable conversion.


A house extension of any kind is enormously exciting, but we understand that it can also be an anxious process, not least because of the large sums of money involved to realise your dreams. So it’s absolutely vital you research the local loft conversion market. You’ll find plenty of builders advertising themselves as loft conversion companies, but you need to be completely confident in the loft conversion company you decide to work with on this most important of projects.

A successful and unblemished track record is rarer than you might think among loft conversion companies. We’re proud to stand apart from the competition. Our long standing in the North London and Hertfordshire loft conversion marketplace, and the numerous testimonials and referred business we receive provide invaluable reassurance of our commitment to quality and the improvement of our clients’ homes.

Step by step to your loft conversion.

We’ll confirm a convenient day or evening time for our managing director, Richard Lever, to visit you in your home. The home visit allows us to discuss your needs in as much depth as you would like and to carry out a survey of the loft space and assess potential loft conversion design ideas. Hopefully you’ll have looked at some of the many loft conversion examples in our portfolio already, and perhaps have your own wish-list of ideas already. Depending of course on the size of your attic space, our visit should take no longer than half an hour.

From our discussions and the loft inspection, we produce our detailed quotation within a week. We can provide this by email or by post if you prefer.

If you decide you’d like to appoint us as your preferred loft conversion company, we ask for an initial deposit of just 5% of the quoted loft conversion cost. This allows us to instruct our architect to visit your home, discuss your loft conversion ideas and produce detailed architectural plans within a few weeks. The deposit also allows us to schedule an approximate start date and build time. We’ll then contact you a month before two dates: the erection of scaffolding and a confirmed start date shortly after. This way, the start date means the start of the loft conversion itself.

Our craftsmanship and care are our reputation and our future, and we leave nothing to chance. Our owner and MD, Richard, has upheld the highest standards in converting lofts since founding Apex in 1992, and because he still loves the hands-on approach, he is on-site with every project, working alongside the team.

Our workforce comprises long-standing employees and partners for all construction, electrics, plumbing and exterior roofing work, all overseen on-site by Richard. There’ll never be an unfamiliar face working on your attic conversion; even our plasterers (the only trade we subcontract) are people we’ve worked closely with for many years.


Loft conversions for terraced and semi-detached houses always require a Party Wall Agreement. That’s because various RSJs (steel beams used to support the structure) will rest on and inside the party wall. Even though the beams will rest only on your half, a Party Wall Agreement has to be entered into to avoid any disputes arising once work has started.

Party Wall Act 1996

The Party Wall Act provides a building owner who wishes to carry out various sorts of work to an existing party wall with additional rights going beyond ordinary common law rights.

The most commonly used rights are:

  • to cut into a wall to take the bearing of a beam (for example for a loft conversion), or to insert a damp proof course all the way through the wall
  • to raise the height of the wall and/or increase the thickness of the party wall and, if necessary, cut off any projections which prevent you from doing so
  • to demolish and rebuild the party wall
  • to underpin the whole thickness of a party wall
  • to protect two adjoining walls by putting a flashing from the higher over the lower, even where this requires cutting into an adjoining owner's independent building.

If you intend to carry out any of the works mentioned, you must inform all adjoining owners. In fact, you must not even cut into your own side of the wall without telling the adjoining owners of your intentions.

The Act contains no enforcement procedures for failure to serve a notice. However, if you start work without having first given notice in the proper way, adjoining owners may seek to stop your work through a court injunction or seek other legal redress.

An adjoining owner cannot stop someone from exercising the rights given to them by the Act, but may be able to influence how and at what times the work is done.

The Act also says that a building owner must not cause unnecessary inconvenience. This is taken to mean inconvenience over and above that which will inevitably occur when such works are properly undertaken.

The building owner must provide temporary protection for adjacent buildings and property where necessary, and of course is responsible for making good any damage caused by the works or must make payment in lieu of making good if the adjoining owner requests it.

It is obviously best to discuss your planned loft conversion works fully with the adjoining owners - although a professional adviser can do this on your behalf - before you give notice in writing about your loft conversion plans. If you have already ironed out possible snags with your neighbours, this should mean that they will readily give consent in response to your notice. You do not need to appoint a professional adviser to give the notice on your behalf.

While there is no official form for giving notice, your notice must include the following details:

  • your own name and address (joint owners must all be named, eg Mr A & Mrs B Owner)
  • the address of the building to be worked on
  • a full description of what you propose to do (it may be helpful to include your attic conversion plans but you must still describe the works in words)
  • when you propose to start (which must not be before the relevant notice period has elapsed).

The notice should be dated and it’s advisable to include a clear statement that it constitutes a notice under the provisions of the Party Wall Act 1996. You may deliver the notice to the adjoining owner in person or send it by post. Where the neighbouring property is empty or the owner is not known, you can address the notice to "The Owner", adding the address of the premises, and fix it to a conspicuous part of the premises. You do not need to tell the local authority about your notice. The notice should be served two months before the planned starting date for work to the party wall. The adjoining owner may agree to allow works to start earlier but is not obliged to, even when agreement on the works is reached. The notice is only valid for a year, so do not serve it too long before you wish to start.

Agreements must always be put in writing.

If you cannot reach agreement with the adjoining owners, the next best thing is to agree with them on appointing what the Act calls an "Agreed Surveyor" to draw up an "Award". The agreed surveyor should NOT be the same person that you intend to employ or have already engaged to supervise your building work. Alternatively, each owner can appoint a surveyor to draw up the award together. The two appointed surveyors will select a third surveyor (who would be called in only if the two appointed surveyors cannot agree).

In all cases, surveyors appointed under the dispute resolution procedure of the Act must consider the interests and rights of both owners and draw up an award impartially. Their duty is to resolve the matters in dispute in a fair and practical way. Where separate surveyors are appointed by each owner, the surveyors must liaise with their appointing owners and put forward the respective owners' preferred outcome. However, the surveyors do not act as advocates for the respective owners. They must always act within their statutory jurisdiction and jointly prepare a fair and impartial award. The surveyor (or surveyors) will prepare an "award" (also known as a "party wall award"). This is a document which:

  • sets out the work that will be carried out
  • says when and how the work is to be carried out (for example, not at weekends if the buildings are domestic properties)
  • specifies any additional work required (for example necessary protection to prevent damage)
  • often contains a record of the condition of the adjoining property before the work begins (so that any damage to the adjoining land or buildings can be properly attributed and made good)
  • allows access for the surveyor(s) to inspect the works while they're going on (to see that they are in accordance with the award).

Download a sample Party Wall Agreement »

If this hasn’t answered your query, or you’d like to discuss the best way to talk to your neighbours about your planned loft conversion, please do give us a call on 01707 658604 or by email.


Typically, a rear dormer loft conversion on a terraced property will take four and a half weeks to complete and a gable-end and rear dormer conversion on a semi-detached property will take five and a half weeks to complete.

You can feel confident that these loft conversion timescales are an accurate guideline; because we directly employ our full-time tradesmen, we’re not reliant on subcontracted labour, and that means complete reliability and no last-minute letdowns by outside trades.

This means, barring exceptional weather conditions, we are extremely confident of all projected loft conversion timings, and your own loft extension timescale will be detailed in our initial quotation.


Absolutely – our loft conversion company is, we’re proud to say, busy all year round.

We convert lofts in winter using a system which ensures your home is never exposed to the weather at any time during the loft conversion works, just as we do during the summer.


Thankfully, planning permission for loft conversions is no longer needed in most cases.

On 1st October 2008 the planning laws for loft conversions in England and Wales changed significantly. Before then a Total Permitted Development (PD) allowance was granted on a property to allow it to be extended before it would require planning permission: a maximum of 50 cubic metres for a terraced home and 70 cubic metres for a semi-detached. A loft conversion could be constructed up to a volume of 40 cubic metres for a terraced property and 50 cubic metres for a semi-detached before it required planning permission.

These maximum figures still apply to loft conversions. But before the law changed, if you already had a ground floor extension then the volume of the extension would be subtracted from the loft conversion allowance, which meant that in a lot of cases seeking planning permission for attic conversions was inevitable.

What’s more, obtaining permission was always a minefield since different local authorities had different criteria on planning regulations. Under the new simplified planning laws, only a few loft conversions need planning permission.

There are some restrictions with the new planning rules, however:

Loft and roof conversions

  • Must not exceed the highest part of the existing roof (its ridge line)
  • Dormer windows are not allowed to be front-facing a highway
  • There is a maximum volume limit of 40 cubic metres for terraced houses and 50 cubic metres for semi-detached and other dwellings
  • Planning permission must be sought in conservation areas.


  • Materials shall match as closely as possible or be of a similar appearance to those used on the exterior elevations of the existing house
  • Other than in the case of a gable end, the rear dormer of the attic conversion shall not be less than 200mm from the edge of the original eaves
  • Side windows in gable end loft conversions shall be obscure-glazed and either non-opening or have the opening sash positioned more than 1.7 metres above floor level
  • Any other alteration to the roof of a dwelling house must not protrude more than 150mm beyond the original roof plane, or be higher than highest part of the original roof.

For more information on the new planning laws that came into effect after 1st October 2008 governing England and Wales you can view the government’s Planning Portal.

Alternatively, contact us now for a free, no-obligation loft conversion suitability survey and quotation for your home: 01707 658604 or email.


The local authority is involved from the start to the finish of the roof conversion. But don’t worry - we take care of it all for you.

First of all the local authority receives the plans from the architect and checks all the structural calculations through the Borough Engineer’s department.

Once these have been confirmed, along with all the relevant building regulations for loft conversions, an approved set of plans are returned and we can start converting your loft.

During the various stages of loft conversion construction, a building’s inspector from the local authority arrives to make sure all the structural work adheres to guidelines and building regulations are being carefully followed. Once we’ve finished the loft conversion, a final inspection is carried out.

Once the project is confirmed as meeting all the requirements, a completion certificate is sent to you, the homeowner, confirming that your loft conversion complies with the building regulations covering England and Wales.


Nearly all lofts or attics can be converted, as long as they are not breaching planning or conservation guidelines.

However, the height of your roof ridge is crucially important. If you were to stand in the centre of the roof and measure from the top of the existing ceiling joists in the inside of your loft, to the top of the ridge board at the apex of the roof, and you have a minimum of 2.2 metres, then the loft is suitable for conversion. If the measurement is less than 2.2 metres, even though the regulation on height has been relaxed in loft conversions, it is unlikely you would have enough useable headroom clearance.

To be sure, call us now to arrange a free, no-obligation loft conversion survey and quotation on 01707 658604 or by email.


These are absolutely vital questions to ask of any loft conversion companies or general builders you speak to.

At Apex Loft and Roof Conversions we have employer’s liability insurance of £10,000,000 and individual public liability insurance of £1,000,000. Both are available to see on request.

We also offer a 10-year structural guarantee on our loft conversions* and provide a 1-year free maintenance guarantee.

We are a member of the Guild of Master Craftesmen and our membership details can be found on the website. For further reassurance, please take a look at a sample of the many testimonials we’ve received from satisfied customers.

* An indemnity insurance can be purchased by the homeowner to provide a 10 year structural guarantee if required. Details on request.

How do I obtain a quote?

Obtaining a quotation from Apex Loft Conversions is easy and straightforward. All you have to do is call our team directly to discuss your requirements and we will offer a no-obligation survey and quotation. Quotations are based on variable factors that differ from job to job which is why it’s important that we first get to understand the ins and out, as well as your personal requirements.

Why choose Apex Loft Conversions?

Apex Loft Conversions have decades of experience when it comes to designing and constructing all types of loft conversions including Velux, dormer and hip to gable loft conversions. We are proud to be a certified Velux installer and accredited members of the Guild of Master Craftsmen. We have previously completed hundreds of different projects throughout North London and Hertfordshire with customer satisfaction at the heart of everything we do.

Will the loft conversion add value to my house?

It’s no secret that adding a loft conversion to your property will undoubtedly add value. As a general rule of thumb, deciding to go ahead with a loft conversion can actually add anywhere between 10-20% to the value of your home. Of course, this can vary depending on a few factors such as the location of your property, the type of loft conversion you have decided to go ahead with and the size of the extension.

Are loft conversions built in the winter months too?

Although summer is the most popular time for loft conversions to be built, loft conversions can take place in the winter and colder months too. As long as there is sufficient and protective scaffolding in place, work can be carried out in more or less any type of weather condition. Over the years, we have carried out equally as many projects in the winter as the summer months with our high standards maintained regardless of the season.

How do I choose the best loft converter?

After you have decided that you want to go ahead with a loft conversion, the next and probably most important step is selecting the best loft conversion company for the job. A good place to start is by choosing a fully accredited company that is part of a well-recognised accreditation body in the industry. Secondly, check out Google My Business and online reviews to verify the credibility of the company you are considering. Apex Loft Conversions have over forty 5-star reviews!

How much head height is required for a loft conversion?

During the survey process, our team at Apex Loft Conversions will measure the head height in the loft. The minimum height you need for a loft conversion is 2.2m. Of course, you can also measure that for yourself before you call our team and enquire too. It’s very likely that if it’s 2.2m or more, your loft should be tall enough to convert. If your property is a cottage or similar then it’s likely that there may not be sufficient head height from our experience.

What are the window options for my loft conversion?

There are a wide range of options to select from when it comes to windows for loft conversions. The type of windows selected will depend on the type of loft conversion that you decide to go for. However, some of the most commonly requested and chosen windows for loft conversions include dormer windows, rooflights, gable-end windows and many more. There are so many options to choose from that will bring light and fresh air into your attic room.

How long will it take from start to finish?

The first step before undertaking the loft conversion is to check with the local authorities about planning permission. If required, this can take up to 8 weeks at the most and it’s important that we get approval before work is started. How long the actual construction of your loft conversion will take depends on variable factors such as the size of conversion and type of conversion. The conversion could take anywhere between 4-8 weeks to finish to a high standard.

What type of properties are eligible?

Loft conversions are arguably the UK’s favourite way to add new space and extend property space. The existing structure of your property should be considered and specific variables such as the floor area, roof angles and type of roof will be considered by our team. It’s true that not all houses are suitable for loft conversions.

Will there be much disturbance during construction?

There will be a certain level of disturbance with the amount of construction work that goes into building the loft conversion. However, 90% of the work is contained in the roof and choosing a credible and reputable loft conversion company just like Apex Loft Conversions will go a long way to minimising any disruption. Everywhere is left clean and tidy at the end of each day. If we need anything specific from you during the build then we will let you know well in advance.

What is the most popular loft conversion?

It's 2022 and there are a number of popular loft conversions ideas and trends to select from. It's no secret that loft conversions are the UK's number #1 home improvement option as they offer such flexibility and a multitude of options for homeowners to choose from. Some of the best loft conversion ideas include home offices, small gyms, bathrooms, and much more. Find out more about the best types of flooring for your loft conversion by clicking HERE.

What is the best loft conversion flooring?

Choosing the best flooring for your loft conversion is absolutely essential. The best type of flooring for your loft conversion will largely depend on the area that you have to work with within your loft and also the type of room you’re looking to convert it to. Apex Loft Conversions - your loft conversion specialists - are experts in providing loft flooring. Find out more about the best types of flooring for your loft conversion by clicking HERE.