INTRO: 1970s Bungalow to 1.5 Storey Renovation

[ambient]

Hi all 👋🏼,

 

I wanted to introduce myself and our project as I anticipate I'll be in hot pursuit of the forums thoughts, opinions and experiences in the forthcoming months.

 

We purchased a 3-bedroom 1970's bungalow in August 2022 but had some planing complications due to a parish council policy that attempted to dictate that "a bungalow must stay a bungalow". 15 months later our planning application was finally granted, albeit with some compromises.

Here's a few points on what we're attempting...

• Replace existing roof (& ceilings) entirely, building up the walls ~80cm, adding a new roof with 1.2m increased ridge height and steeper pitch
• Upstairs will accomodate two bedrooms, bathroom and "breakout area" overlooking hallway void
• Large single-storey flat roof side and back extension out to locate 65sqm kitchen/diner
• Complete re-configuration of downstairs layout
• Complete replacement of heating system (gas will be cut off entirely)
• New ASHP (current thinking Valliant Arotherm Plus, one-zone, no buffer)
• UFH all-round on ground floor (retrofit lo-profile UFH on top of the existing slab (Wunda?), insulated/screeded in new extension). Possibly fan convectors in bed-rooms upstairs
• Complete rewire I would assume
• MVHR (current thinking is a radial system installed through new posi-joists, manufacturer TBH but will get BCF to design)
• New solar panels, and battery (current thinking GivEnergy to unlock Octopus Intelligent Flux)
• New double-glazing all round (Residence R7 probably)  also 2.7m high, ~8m wide sliding doors at rear (either Corteso Cor-vision or Minima)

 

The biggest grey-area for us at the moment is how much to focus on/invest in improving the insulation and air-tightness of the existing exterior walls. I'll raise a separate thread for this in due course.

 

Fortunately we were able to leverage a second mortgage and keep our existing home so we don't intend to live in the place whilst the majority of the work is taking place. The properties are only 0.5 mile apart so I am hoping I'll be able to keep a close eye on the build whilst I work from home. We are also intending to do a little of the work our-selves as possible (i.e. fitting MVHR, UFH, painting & decorating, airtightness membrane?, etc).

 

Thanks for having me and in advance for any advice,

Ollie
Fleet, Hampshire

 

Plans

 

24 OD - Amendments Combined.pdf

 

Concept Images

 

 

 

Existing Images

 

 

 

 

 

 

 

[ambient]

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[ambient]

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[LiamJones]

Sounds similar to what I’m doing at the moment! Look forward to seeing progress! Good luck!

[Markuz]

On 07/01/2024 at 16:27, ambient said:

 

 

 

The biggest grey-area for us at the moment is how much to focus on/invest in improving the insulation and air-tightness of the existing exterior walls. I'll raise a separate thread for this in due course.

 

 

 

 

 

 

 

 

I would say external wall insulation is not crazy expensive, its return will be in less heating ( obviously) but also helps with air tight envelope. Its all in the details and how well the not so straightforward areas are sealed.

 

Fair few ways to get air tightness, for example Wraptite External Air Tightness Barrier ( super expensive) , intelligent membranes (https://www.intelligentmembranes.com/products)

 

There is another way which is a blown sealing method to achieve great airtightness https://www.aerobarrieruk.co.uk/

 

I do agree, a bungalow must stay a bungalow! We are buying one as well.

Edited January 17 by Markuz

[jack]

On 07/01/2024 at 16:30, ambient said:

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Just FYI, edits are only allowed for half an hour after the original post, so you won't be able to come back and add to the placeholder posts.

[jack]

Welcome!

 

Sounds like quite a project. 

 

Did you cost knocking down and replacement? Much more predictable costs, you get the VAT back. and obviously a lot more flexibility with layout.

 

The downside from here would be more delay and fun with planners, but the principle of significant redevelopment has been established, so the council can't insist on a bungalow (not that it should have been anyway).