Frequently Asked Questions (FAQ)

What does a steel building cost?

The cost of a steel building can vary and depends on a number of factors such as size, material, location, etc.

For example, we recently quoted a double garage (6m x 12m x 2.6mH, single skin steel with two roller doors and one PA door) at just over £8 000, excluding VAT and erection costs; and a warehouse facility (30m x 28m x 5.3mH, single skin steel with three roller doors, two PA doors and skylights) at approximately £94 000 excluding VAT and erection costs.


Do I need planning permission?

Our steel buildings are intended as permanent structures, so it is very likely that you will, however we strongly advise you check with your local authority. We do not undertake planning permission applications on behalf of clients.

Some designs might be allowed without the need for planning permission under Class E Permitted Development rights (England and Wales only).

The key parts of that apply here are that:

  • any part of the new building should not be forward of the principal dwelling on the site;
  • the building should be single storey;
  • with a dual pitch roof, the building should be no higher than 2.5m to the eaves or 4m overall if it’s more  than 2m from the boundary of your property, or;
  • no higher than 3m overall if it’s within 2m of the boundary of your property;
  • mono-pitch buildings must be no higher than 2.5m to the low side eaves and no more than 3m to the high side eaves.

There are other limitations on building relating to Listed buildings, placing a building on a World Heritage Site and the use of the new building. Additionally, you local planning authority may have applied individual bye-laws and limitations.

To download the full UK government advice on permitted developments please, click here.

To find the contact details for your local planning authority at the Planning Portal website here.


What grounds work do I need to do beforehand?

You must have a a secure and stable surface on which to erect your steel building. This should be a minimum thickness concrete pad that allows the wall cladding to overlap and allow rain water to run off and not leak into the building; and individual concrete pads for the steel columns to be fastened to.

We can provide you with a specification for the base when your purchase your building. Simply ask for this when you ask for your quote.


What’s the difference between cold rolled and hot rolled steel?

Hot rolled steel is easier to make, to shape and form. It has its source in a mill process involving rolling the steel at high temperature. Hot rolled steel is commonly used when precise shapes and tolerances are not essential.

Cold rolled steel is heated and cooled at the room temperature and then rolled after again. The steel is processed further, where the material is cooled (to room temperature) followed by forming the material by either press-braking or cold roll forming to achieve the desired shape.

Hot rolled steel comes with a scaly surface, slightly rounded edges and corners and the surface is non-oily. It’s less pretty but also less expensive, and it can be used in wider and higher structures. We tend to use hot rolled steel for larger and wider structures, usually those wider than 20m (sometimes just less) and higher than 6m to the eaves.

Cold rolled steel has an oily or greasy finish, very smooth surface, and very sharp edges. It’s less expensive but allows for more accurate shaping and a better surface appearance. This is preferable in smaller buildings up to 20m wide and 6m to the eaves.

You can read our article on the differences between hot rolled and cold rolled steel buildings by clicking here.


What the difference between single skin and composite cladding?

Single-Skin Steel Cladding roof and wall systems consist of thin coated steel sheets (usually 0.5mm or walls and 0.7mm on roofs) rolled to several different profiles. The more common profile we supply is Box Profile. They may be used to form roofs and walls and include a comprehensive range of fixings, sealants, guttering, flashings and roof lights.

Composite cladding panels are insulated steel cladding which consists of two coated steel profiles bonded to a core of PIR insulation; they may be used to form roofs, down to a 6 degree pitch, and walls. The external faces have clean, sharp lines and the panels are available in an extensive range of finishes and colours.


Who makes your steel buildings?

We have a number of suppliers for our steel buildings. Among these are Kingspan and A Steadman and Son Ltd, Carlisle.

We used a variety of suppliers for structural and hot rolled steel and all of our suppliers are renowned in the industry for the quality of their products and excellent service.


Can I erect the steel building myself?

If you wish to construct the building yourself you are free to do so, however we would STRONGLY advise you let our qualified and experienced erection team construct the building on site for you. With 25+ years experience it will give you peace of mind and also leave you covered if you need any after sales service.


What’s the biggest steel building you can make?

Our cold rolled designs can reach a single width span of 20m and a height of 6m, although we can combine frames from multiple buildings and remove interior walls to create a wider overall building as necessary. There is no limit to the length of cold rolled steel building we can provide.

If you require a building large than 20m or higher than 6m to the eaves we can quote you a building in hot rolled steel.


Will I get condensation in my building?

It’s difficult to say, without knowing the precise conditions, what level of condensation and moisture will form in a steel building once it’s erected. Our single skin sheet cladding had a internal, anti-condensation lining that helps pull moisture out of the atmosphere inside the building, thereby mitigating against any damp.

Composite, or insulated cladding, is much more effective. Our suppliers recommend a minimum of 80mm composite cladding on the roof and 60mm composite cladding on the walls to effectively mitigate condensation.


What’s the highest your steel buildings can go?

Our steel buildings can reach as high as 6 metres to the eaves. The ridge height will vary depending on the pitch of the building.


Why do you need the site post code?

Our design process takes into account things like distance from the sea, topography and altitude above sea-level to factor in wind resistance and also snow loading requirements.

By providing the postcode for your building site we can design a building that takes account of these additional elements to make sure you have a building fit for purpose.


What’s the difference between an industrial building (Class 1) and an agricultural one (Class 2)?

Great care must be taken when determining the usage or classification of a building. The dead loads (snow loads) that agricultural buildings can withstand are significantly less than for the industrial classification.

Classification in British Standards are:
Industrial Class 1 – Human occupation is unlimited, and there is no minimum distance restriction from other occupied building or highways. Be mindful that boundary conditions may apply and a fire boundary required. Minimum design life 50 years
Agricultural Class 2 – Human occupation not to exceed 6 hours per day at a maximum density of 1 person per 100 sq m. Building must be greater than 20 metres from nearest occupied building and or highway. Minimum design life 10 years.


Can you supply other building work services, such as partition walls, electrics, security, etc.?

We can incorporate partition walls, however it depends very much on the structure and design of the building.

We do not offer fit out services for our buildings. You would need to find a separate contractor for those items.


Where do you supply steel buildings to?

We supply and erect steel buildings to anywhere in the United Kingdom.


What types of payment do you take?

We accept BACS payment and Faster Payments.

Please note that for security and fraud reasons we do not accept credit cards, either company or personal.


Do you offer finance?

We do!

We offer finance to business customers* who are looking to spread the cost of their building over time. See our Business Finance page here.

Unfortunately we don’t offer finance to non-business customers at present but this is something we’re looking into.

Please note, we no longer offer the Bonded Order/Advanced Payment facility.

*Finance is available for business customers only. Subject to affordability checks. Applicant must be 18 or over. Available on new steel buildings only with a minimum RRP of £5 000. Castle Steel Buildings Limited is an introducer appointed representative of Peregrine Asset Finance Ltd, 3 Maple House, Wykeham Road, Northminster Business Park, Upper Poppleton, York, YO26 6QW. Registered in England No 4208223. Peregrine Finance is authorised and regulated by the Financial Conduct Authority number FRN649227


What are your delivery and turn around times?

We usually operate on 3-4 weeks delivery turnaround however the industry is still being affected by the global shutdown during COVID-19 and is now affected by the on-going conflict in Ukraine.

You can check our latest turn around and lead times on our lead times page here.


FAQ v2.0 – Updated 01/06/2022 – JR