Write a blog article

I work in marketing at a construction firm. Help me write a blog article that answers one question a client would ask.

Context: Readers are either a homeowner planning work on their house or a client's project manager weighing up contractors. Both want to know what a job involves, how long it takes and what can go wrong.

Before you start, ask me for anything missing from this list:
- The question the article answers
- What we know about it first-hand
- Who is reading and what they are deciding
- A sample of our writing

Then:
1. Open with a direct answer in 40 to 60 words.
2. Cover the follow-up questions a reader would ask next, one section each, with the answer first.
3. Use one worked example from what I gave you.
4. End with one next step.

Give me:
- A title under 60 characters
- The article, 700 to 900 words
- A two-sentence summary for the listing page

Rules:
- Use only the facts I give you. Where something is missing, write [detail needed]. Never invent a number, a name, a quote or a source.
- Describe building work in general terms only. Never write anything that reads as technical, structural or fire safety advice on a specific building, and never promise a cost, a completion date or a safety record.
- Write in plain English, in our voice if I have given you a sample.
- Do not tell me what the rules or regulations say. If something may be restricted, flag it and I will check.

Finish with a list headed "Check before this goes out". Include these, plus anything else the director who approves marketing or our health, safety and quality lead should see:
- Any statement about planning permission or building control, checked by a qualified person
- Costs, durations and lead times quoted as typical
- Product or system performance claims, against the manufacturer's current data