> For the complete documentation index, see [llms.txt](https://docs.altum.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.altum.ai/english/sustainability/nta-8800-energylabel-v2-api/apartments/migration-guide-v1-v2.md).

# Migration Guide: v1 → v2

This page provides an overview of the changes required when migrating from v1 to v2 of the API.

## 1. Request Body Changes

**v1**

```
{
    "post_code": "3024XL",
    "house_number": "227",
    "house_addition": "B"
}
```

**v2**

```
{
    "postcode": "3024XL",
    "housenumber": "227",
    "houseaddition": "B"
}
```

## 2. Input Changes

### a. Basic Features

#### New Inputs

* `electric_cooking`
* `cooling`
* `apartment_type`

#### Solar Panel Input Changes

The `solar_panels` structure has changed from a **single integer value** to a **list describing individual solar panel installations**.

New solar panel related fields include:

* `solar_panels` (per solar panel)
  * `pv_total_watt_peak`
  * `pv_area`
  * `specific_watt_peak`
  * `angle`
  * `orientation`

## 3. Output Changes

The response structure now includes additional fields and updated naming.

#### New Outputs

* `cooling`
* `electric_cooking`
* `solar_panels` (per solar panel)
  * `roof_surface`
  * `original_watt_peak_capacity`
  * `total_watt_peak_capacity`
  * `inclination_angle`
  * `orientation`

## 4. Feature Value Changes

The value range for several features has changed.

Previously these values ranged from **0–3**, but they now range from **1–4**.

Affected features include:

* `wall_insulation`
* `floor_insulation`
* `roof_insulation`
* `living_room_windows`

#### Example

**v1**

```
1 = mediocre wall insulation
```

**v2**

```
2 = mediocre wall insulation
```


---

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