HL HeatNet — Part L 2026 Navigator

Worked examples

Section 1

Project

Project name

Development type

Calculation route R24

Heat network type ADL1 1.6–1.7

District: supplies consumers in two or more buildings from central source(s) through a pipe network. Communal: supplies heating, cooling or hot water only within a single building divided into separate premises. Ambient loop: sub-50°C shared source with unit heat pumps. Classify on the legal / building-control building boundary, not on block or address counts — this decision fixes the pathway.

Zoning status of the site HNZ

Leeds, Plymouth, Bristol, Stockport, Sheffield and two London schemes were announced as pilot / advanced-development schemes — not automatically designated zones. Only formal designation triggers connection requirements for new buildings; earlier statuses warrant early engagement.

Overall network primary heat source — context only

Sleeving eligibility is determined by the eligible-energy numerator and calculated percentage in Section 2, not by this contextual selection. Only Table 1.2 types can count in that numerator: electrically powered heat pumps, waste heat, geothermal, electric boilers, solar thermal, biofuels.

Section 2

Sleeving declaration ADL1 1.8–1.9

Is sleeving being claimed?

Only district heat networks can be sleeved — communal networks cannot 1.8 NOTE. The declaration is made to building control by the body operating the network.

Declaration inputs apply when sleeving is claimed on a district network. They are inactive for the current selection.

Network provides both space heating and hot water? 1.9(a)

Annual space heating + hot water demand (kWh/yr) 1.9(b)

Annual heat delivered by the district network (kWh/yr) 1.9(c)

Of that, heat from new or unused Table 1.2 capacity allocated to this scheme (kWh/yr)

Enter the three figures above — network share of demand and the eligible-capacity share are computed from this auditable balance. At least 90% of the network-delivered energy must be eligible.

Is the eligible-energy numerator (kWh above) derived exclusively from new or unused Table 1.2 capacity? Table 1.2

Up to 10% of the network-delivered energy may come from non-qualifying plant — a 92% heat-pump / 8% gas allocation passes. What must be pure is the eligible numerator itself: exclude any non-Table 1.2 energy from the kWh figure above.

Any temporary plant is also a Table 1.2 type? 1.9(d)

Declared kWh calculated with the same version of the methodology / software as the compliance calc? 1.9(b)

Declaration validated by a suitably qualified third party? 1.8

Has this capacity been declared for any other ongoing or completed application? 1.9(e)

"Yes" is a hard fail — the same capacity cannot support two declarations.

New capacity delivered within 5 years of the as-built assessment? 1.9(f)

Is planning permission required for the new capacity? 1.9(f)(i)

If required — has planning permission been granted?

Signed contract to connect and supply heat? 1.9(f)(ii)

The contract is mandatory for future capacity; planning permission applies only where required.

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Compliance pathway

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Interpretation

What this means

Director summary

Profile

How these scores are assessed

Scores are ordinal (1–5) and derived from the live result, not fixed opinions. Complexity scales with the breadth of the evidence register for the current pathway. Evidence burden scales with the count of items still to obtain, verify or close. Attention rating starts at 1 and adds a weighted point per named driver listed above — declaration gaps +3, network-factor exposure and declaration reliance +2, procedural items +1 — capped at 5. It is an indicative screening score generated by the navigator; it is not a statutory, insurance, cost or programme risk rating.

Evidence & declaration register

Clause basis and live status

Item	Clause	Status

No items match this filter for the current pathway.