Buying a house with a flat roof?
Buying a house with a flat roof?
Author
Discussion

captain_cynic

Original Poster:

17,480 posts

125 months

Monday 18th August 2025
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Would you?

Looking at a house and it ticks almost all my other boxes, great location, good interior, nothing major looks wrong with it aside from the fact it has a flat roof? It's semi-detached,what we'd call a duplex back in Oz, only two houses attached to each other, if that helps.

EA said the roof was replaced back in 2017, which one would assume would come out in the survey if that were less than honest.

Seller seems motivated to sell, which is a plus.

Aluminati

2,985 posts

88 months

Monday 18th August 2025
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Apart from the fact they can look awkward and ugly, my overiding concern would be what the current membranes are/what warranty is in place.

Rayny

2,458 posts

231 months

Monday 18th August 2025
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Flat roof is usually considered non-standard construction, therefore obtaining insurance may be more difficult/expensive.

rodericb

8,915 posts

156 months

Tuesday 19th August 2025
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Whereabouts and what is the roofing material?

fourstardan

6,589 posts

174 months

Tuesday 19th August 2025
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Don't they get noisy in downpours as well?

ozzuk

1,460 posts

157 months

Tuesday 19th August 2025
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I'd think twice, especially if it's the entire roof - but obv factor in price / plans for house. I'd want to know if regs were obtained for the replacement (should have been if whole roof) as that will give you a sense if they did things properly. failing that I'd budget for new worst case.

PhilboSE

6,182 posts

256 months

Tuesday 19th August 2025
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I’d want to know exactly what the original roof was, why it failed, and what it was replaced with. I’d also want to understand what the roof substructure was, and that Building Regs compliance was obtained for the re-roofing.

There are some flat roof materials that have proven their viability for more than 70 years, but they aren’t particularly compatible with traditional domestic building structures (I’m thinking of concrete slab roofs with mastic asphalt covering).

OutInTheShed

14,817 posts

56 months

Tuesday 19th August 2025
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My parents' house had 50% flat roof.

Insurance needs consideration, you can't just go on a comparison site and buy it in 5 minutes, but it wasn't silly expensive (like thatch...).

Not having much of a loft helps you not to collect so much tat.

Conventional felt, budget for replacement every 20 years. Other systems are available to suit varying tastes.
I've seen most flat roof systems have problems, but people have problems with tiled rooves too.

Aluminati

2,985 posts

88 months

Tuesday 19th August 2025
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As long as it doesn’t have 4 m upstands, it’ll be fine biggrin


richhead

3,463 posts

41 months

Tuesday 19th August 2025
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Ive had several houses with partial flat roofs, all have needed repairs at some time, just my experience.

PhilboSE

6,182 posts

256 months

Tuesday 19th August 2025
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Wtf is going on there? That structure doesn’t look very permanent!?

Inbox

1,337 posts

16 months

Tuesday 19th August 2025
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The problem with a flat roof is that it is flat and horizontal so water can pool which is where problems start.

So long as the roof can drain properly and there isn't standing water they can last well, my Mum's house had a massive flat roof due to height constraints on the extension. The standard felt lasted over 20 years as there was slight fall which allowed it to drain properly.

A horizontal flat roof is a problem in the making.

netherfield

3,196 posts

214 months

Tuesday 19th August 2025
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Late 60s / early 70s local council built a housing estate in the village, very mixed designs, some pitched, some flat roofs.

Then along came the right to buy, all those that did buy with a flat roof regretted it a few years down the line when they started leaking, tried crying to the council for help, but none given, turns out hardly anyone had a survey done when buying.

And we've now got 2 or 3 schools with flat roof problems, and a hospital which has had millions thrown at the roof over 50 odd years.

Lotobear

9,187 posts

158 months

Tuesday 19th August 2025
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Nothing wrong with flat roofs per se - there are lots of technically good systems around these days. The main question IME is whether due regard has been had to interstitial condensation risk - you really want to know whether it's a cold roof (high risk) or a warm roof (controlled risk).

Even though this cold roof was cross ventilated, it didn't work






119

20,094 posts

66 months

Tuesday 19th August 2025
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File under…

Pubs with flat roofs.


lizardbrain

3,820 posts

67 months

Tuesday 19th August 2025
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it wouldn't put me off if access was good, no scaffolding needed

but you have to accept they can fail at basically anytime.

they are relatively easy to patch or fix though vs some roofs so swings and roundabouts

Monkeylegend

29,504 posts

261 months

Tuesday 19th August 2025
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Our bungalow extension is a flat roof and equates to about 40% of the total roof area.

There is a slight slope from the middle to each side for drainage.

It was built in 1992 and has been no problem from either leaks or insurance. Our insurance for this year is £220 and has never been anymore than £240 ish.

captain_cynic

Original Poster:

17,480 posts

125 months

Tuesday 19th August 2025
quotequote all
Thanks everyone,

I fear this might not be a sale for entirely non-roof related reasons.

If things work out I'll be sure to find out about warranties and the material used last time it was done.

Aluminati

2,985 posts

88 months

Tuesday 19th August 2025
quotequote all
PhilboSE said:
Wtf is going on there? That structure doesn’t look very permanent!?
It’s a mono pitch. We’re doing the slating the other side.



Aluminati

2,985 posts

88 months

Tuesday 19th August 2025
quotequote all
There’s a lot of misunderstanding regarding flat roofs. The main issue is, domestic clients want a roof for peanuts. Blame the Rubber Roof boys for that.

This roof we have just completed cost £1200 m2.

Social Housing client, and the design scaffold was 40k alone. New fire regs means the tapered insulation cost us £320 m2.

Would a domestic client pay that ? No.