---
type: "Bill"
title: "Restrictions on Use - Solar Collector Systems - Alteration"
description: "Restrictions on Use - Solar Collector Systems - Alteration"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2025"
identifier: "HB 4"
citation: "Maryland HB 4 (2025)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Smith"]
version_count: 3
action_count: 17
vote_count: 2
first_action: "2024-10-30"
last_action: "2025-05-13"
source: "openstates"
source_identifier: "ocd-bill/c4b1fdf3-088f-4336-b022-5e85dcb35baa"
source_url: "http://mgaleg.maryland.gov/mgawebsite/Legislation/Details/hb0004?ys=2025RS&search=True"
source_hash: "dfbb1d3edde5179798fabae65d199ff1a76fcbeebc1df45fbd7a86e203b44e61"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-md"]
---

# Maryland HB 4 (2025) — Restrictions on Use - Solar Collector Systems - Alteration

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Chapter - Restrictions on Use - Solar Collector Systems - Alteration** (committee substitute) — [source](http://mgaleg.maryland.gov/2025RS/Chapters_noln/CH_517_hb0004t.pdf)
2. **First - Restrictions on Use - Solar Collector Systems - Alteration** (committee substitute) — [source](http://mgaleg.maryland.gov/2025RS/bills/hb/hb0004f.pdf)
3. **Third - Restrictions on Use - Solar Collector Systems - Alteration** (committee substitute) — [source](http://mgaleg.maryland.gov/2025RS/bills/hb/hb0004t.pdf)

## Votes

- On Third Reading — **34–13** (pass) · upper
- On Third Reading — **100–36** (pass) · lower

## Sponsors

- Smith — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-10-30** Pre-filed `introduction`
- **2025-01-08** First Reading Environment and Transportation `referral-committee`
- **2025-01-08** Hearing 1/28 at 1:00 p.m.
- **2025-01-13** Hearing canceled
- **2025-01-13** Hearing 1/28 at 2:00 p.m.
- **2025-01-20** Hearing canceled
- **2025-01-20** Hearing 1/24 at 2:30 p.m.
- **2025-02-10** Favorable Report by Environment and Transportation `committee-passage-favorable`
- **2025-02-11** Favorable Adopted Second Reading Passed `committee-passage-favorable`
- **2025-02-13** Third Reading Passed `passage`
- **2025-02-14** Referred Judicial Proceedings `referral-committee`
- **2025-03-26** Favorable Report by Judicial Proceedings `committee-passage-favorable`
- **2025-03-26** Favorable Adopted `committee-passage-favorable`
- **2025-03-26** Second Reading Passed
- **2025-04-02** Third Reading Passed `passage`
- **2025-04-02** Returned Passed
- **2025-05-13** Approved by the Governor - Chapter 517 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/c4b1fdf3-088f-4336-b022-5e85dcb35baa`. Confidence: reported (aggregated from official Maryland legislature records).