There is no difference for LV supplies under a carriageway. UKPN require 600mm below the surface which is the same at BT OR. When its move up to the 11kV and 20/22kV distribution the requirement is increased to 750mm.

Given that a large proportion of the cost for tarmac surfaces is for breaking through and re-instating, there is minimal, if any difference between telecoms and power.

If you want, I can find te appropriate reference documents that cover it.

Follow the money - e.g. look at the £200m contract Gigaclear recently declared with a firm that will do their digging for them

Do some basic calcs on that at say £40/metre and you get 5000km ! That is a lot of trenching ... Go to my lowest suggestion of £20 and it becomes 10,000 km !

The OR Quick Guide to Duct Laying refers to 600mm when crossing a carriageway and teh UKPN document is ECS 02-0019.

In reply to a post by j314:

Pick the most rural location you can think of, and assume you can get past any wayleave and other legal issues. What is the actual cost per mile of running fibre? What is the maximum amount of money that it could cost to get a property connected? I bet it's well under £10k.

Unfortunately not.

The 2008 study by Analysys Mason (for BSG) divided the country into a number of geotypes, based on the then-current exchange size & line length of phone lines.

Pulling example figures out of that report, the cost per property connected (assuming 31% takeup) for GPON was around:
- £1,500 for London, at 3,600 premises per sq.km
- £2,000 for large urban areas, at 1,300 premises per sq. km
- £4,000 for the rural areas around larger cities/towns, at 100-200 per sq. km
- £7,500 for the more rural areas, at 23 premises per sq. km
- £10,000 for the most rural, at 6 premises per sq. km

The numbers would be different now, because half of the investment in FTTC has gone into the fibre spine, and can be reused in GPON. That probably has a large effect on the first couple of categories.

Well @Andrue
I'm sure you can explain the following then
1 My village area was deemed non commercially viable by BT for upgrade
2. My village was then deemed not suitable or some mealy mouthed words by BDUK for an upgrade.

So
Along come Gigaclear and rapidly find the village is commercially viable and we all now have an excellent full fibre FTTP service from them of which I pay for the 50up/50down option.

We in the village have a pretty good idea what was likely to have been happening. This is a seriously up market area and we think BT/BDUK/local council reckoned that they need not upgrade us as we would be so desperate that we would PAY them to upgrade it at our cost as an area which would have the money to do this.
Yes - we think it was indeed a deliberate snub and yes BT made no effort whatsoever to improve their service in this area - best efforts my arrrrse!

Unfortunately BT made a big mis-calculation and have now lost a huge amount of business. At one point BT had taken to ringing up asking people why they were ceasing their BT broadband supply......

In reply to a post by zom22:

We in the village have a pretty good idea what was likely to have been happening. This is a seriously up market area and we think BT/BDUK/local council reckoned that they need not upgrade us as we would be so desperate that we would PAY them to upgrade it at our cost as an area which would have the money to do this.

So you're saying that BT, while getting SFBB service to 94.4% of the country, have decided to leave *your* up-market, affluent area out of the build, in spite of it being cost-effective for them to do so?

A deliberate snub that, if BT aren't doing it to you personally, or to your village personally, they must be replicating that decision throughout the country.

By extension, the remaining 5% is well-chosen as the richest part?

To quote the Gigaclear website:

25 October 2017: Over 10,000 homes and businesses in West Oxfordshire will be connected to ultrafast broadband by the end of 2019, accessing speeds of up to 1Gbps (1,000Mbps), following the announcement of two major infrastructure projects for the area.

The first project is an £8m plan to bring full fibre to 4,600 properties, jointly funded by West Oxfordshire District Council (WODC) and Broadband Delivery UK (BDUK) to the tune of £3.1m, and rural broadband specialist Gigaclear for £5m. In addition, Gigaclear has announced that it is investing a further £8m to connect another 5,700 homes in the area, linking existing networks together and extending the provider�s already significant footprint in the district.

The latter project works out at £1,403 per property.

I wish we had 8meg. We live on the outskirts of a large town in Shropshire, and I've just this minute done a test, ours is 4.01 Mb. Great eh?! Not great to share between 2 adults and 2 kids using phones, tablets, smart tv and gaming etc. Awful.