Cladding

External Wall Insulation & Insulated Render Northampton

External wall insulation, often finished with a render or brick slip system, is one of the more effective ways to improve a property's thermal performance without sacrificing internal floor space the way internal insulation does. We install external wall insulation and insulated render systems across Northampton and Milton Keynes.

How External Wall Insulation Works

The system involves fixing insulation boards to the outside of the existing walls, then finishing over the top, typically with a render system, though brick slips or other cladding can also be used as the finish, covered on our brick slip cladding page. Because the insulation sits outside the existing wall rather than inside the rooms, it doesn't reduce internal space, and it can also help smooth over uneven or ageing external wall finishes as part of the same project.

Who External Wall Insulation Suits

  • Solid-walled properties without a cavity, particularly older homes where cavity wall insulation isn't an option

  • Homeowners looking to reduce heating costs and improve energy efficiency ratings

  • Properties with tired or damaged external render or brickwork that needs addressing anyway

  • Anyone wanting to avoid losing internal room space to insulation, which is the main drawback of internal wall insulation

What Installation Involves

Detailing around openings and the base of the wall matters more with external wall insulation than a standard render job, since getting the insulation continuity and weatherproofing wrong at these points can undermine both the thermal performance and the durability of the finish.

  1. A survey to assess the existing wall construction and confirm the appropriate insulation thickness and system

  2. Fixing insulation boards mechanically and/or with adhesive to the wall, depending on the system specified

  3. Applying a reinforcing base coat with mesh to prevent cracking in the finish

  4. Finishing with the chosen render texture and colour, or an alternative finish such as brick slips

  5. Careful detailing around windows, doors, eaves and the base of the wall, since these junctions are where problems most commonly occur if rushed

Note

Building Regulations and Grants

External wall insulation work in England generally needs to comply with current Building Regulations relating to thermal performance and, in some cases, ventilation, since improving a wall's insulation can affect how moisture moves through the building. Various government-backed schemes have periodically offered grants or funding toward external wall insulation, particularly for solid-walled properties and those meeting specific eligibility criteria, though scheme availability and eligibility change over time. We'd recommend checking current guidance on GOV.UK or with your local authority for what, if anything, is available at the time you're considering the work, rather than relying on older information.

Why Choose Bridgework

  • Proper detailing at openings and junctions, the areas most likely to cause problems if rushed

  • Honest advice on insulation thickness and finish options suited to your property

  • Experience combining external wall insulation with both render and brick slip finishes

  • A clear quote before work starts

Areas We Cover

We cover Northampton and Milton Keynes, and within roughly 30 miles of both, including Wellingborough, Kettering, Rushden, Towcester, Daventry, Buckingham, Brackley, Bicester, Aylesbury, Leighton Buzzard, Dunstable, Luton, Bedford, Newport Pagnell, Olney, Stony Stratford, Bletchley, St Neots, Biggleswade and Corby.

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External Wall Insulation FAQs

This varies considerably depending on the existing wall construction, insulation thickness specified, and the property overall, so we'd avoid quoting a generic figure. We can talk through realistic expectations for your specific property as part of the survey.

It's most commonly used on solid-walled properties without a cavity, though it can also be applied to cavity wall properties in some cases. We'll assess your specific wall construction during the survey.

Various schemes have existed over time, with eligibility depending on factors such as property type, current energy rating and location. Availability changes, so we'd recommend checking current GOV.UK guidance or with your local authority for what applies at the time.

Yes, since a new render or finish is applied over the insulation, changing the wall thickness slightly and giving the property a new external appearance. This is often seen as a benefit where existing walls need refreshing anyway, and we'll talk through finish options during the quote.

Get a Quote for External Wall Insulation

If you're considering external wall insulation or insulated render for your property in Northampton or Milton Keynes, get in touch for honest advice and a clear quote.

Monday to Friday, 8am to 6pm. Emergency and same-day callouts outside these hours.

07749 606444