dissenting: My problem with the majority opinion goes beyond the words written above. Were that text all that was involved in the case, I would be found happily embracing that opinion. I differ, however, in my analysis of the scope of review of the trial court’s order. How far should this court go to determine the existence or non-existence of coverage under an insurance policy found in the record of a declaratory judgment proceeding? Are we limited to the issues raised and determined in the trial court order? Are we limited to issues clearly raised and argued by the parties? Or, having the facts before us, and the written contract spread on the desk, are we not bound to read the document and to determine, as a matter of law, whether or not there is coverage available to the insured?
I would adopt the latter alternative as the proper scope of review and raise it to the level of an obligation. This obligation is particularly strong when our decision strips coverage from the insured. “The general rule is that the court will honor the reasonable expectations of the policyholder.” Town of Epping v. St. Paul Fire & Marine Ins. Co., 122 N.H. 248, 252, 444 A.2d 496, 498 (1982). We construe the language of an insurance policy as would a reasonable person in the *194position of the insured based on a more than casual reading of the policy as a whole. Haley v. Allstate Ins. Co., 129 N.H. 512, 514, 529 A.2d 394, 396 (1987). “[W]e must consider the policy as a whole. ” Andrews v. Nationwide Mut. Ins. Co., 124 N.H. 148, 153, 467 A.2d 254, 257 (1983) (emphasis added). We must keep in mind that the burden is on the insurer to show that no coverage exists. RSA 491:22-a; Laconia Rod & Gun Club v. Hartford Acc. & Indemn. Co., 123 N.H. 179, 182, 459 A.2d 249, 250 (1983). The burden is on the insurer to prove the negative. The insurer must eliminate all contractual awards of coverage. This burden carries through to appeal, and its satisfaction is measured by a more than casual reading of the policy as a whole.
There were four material policies in this ease. Since two ran seriatim to two, and the material terms of each set were acknowledged by the parties to be identical for our purposes, we are really dealing with two contracts of coverage. The first is a comprehensive general liability policy with broad form endorsement. The second is an excess indemnity (umbrella) policy. Although the latter is written in consideration of the existence of the former, they are separate policies with different coverages and different exclusions. Coverage was sought under both policies for defense and indemnification on an underlying liability claim by The Filtrine Manufacturing Company and J.P.C.D., Inc. See Cheshire County Superior Court No. 86-C-064. The underlying liability claim sounded partly in contract, not material to this dispute, and partly in negligence. The negligence claims asserted defective design and improper construction. Damages were sought for property damage and loss of use. The insured brought a declaratory judgment action, during the pendency of the liability case, seeking to be defended and indemnified against any resulting loss. Its petition essentially said, “here’s the writ, and our policies cover the claim.” The insurance company responded, denying coverage and alleging the existence of exclusions material to both design and construction.
The trial court decided the case, finding coverage and specifically rejecting applicability of an exclusion from contractual liability coverage relating to design. Prior to this decision, the underlying liability case was settled by the insured with no findings of liability or the nature of the liability. The insurance company appealed the coverage decision.
The majority reverses the trial court, finding the design exclusion to contractual liability coverage to be valid and unambiguous. I agree with that finding and the result reached by the majority; how*195ever, I would find other coverage applicable, and would remand and order further proceedings to determine whether this coverage applies to require reimbursement for the defense, as far as it went, and what, if anything, in the settlement is appropriate for indemnification.
The majority decision has dealt with one liability claim (design) arising under one policy (comprehensive general liability, as endorsed). The design claim under the umbrella policy has been ignored by both the trial court and this court. The defective construction claim under both policies was not addressed.
Reading the policies as a whole, I agree with the trial court that there is coverage in the first instance under both policies. I agree with both the trial court and the majority that the insurer’s obligation should be based on coverage for contractual liability. Contractual liability coverage is afforded under the comprehensive general liability policy, as endorsed. The majority is correct in finding that coverage for design liability is unambiguously excluded from this coverage. It would appear that defective construction liability coverage is also excluded by the infamous exclusion “o” (property damage to work performed by the insured). However, this exclusion “o” has been held to be ineffective when appearing with the language we find in the comprehensive general liability policy. Commercial Union Assurance Cos. v. Gollan, 118 N.H. 744, 394 A.2d 839 (1978) (exclusion (a), as broadened by the endorsement, affords backdoor coverage for unworkmanlike performance which is fundamentally inconsistent with exclusion “o”). In this case, exclusion (2)(d)(iii) of part VI of the Broad Form Comprehensive General Liability Endorsement replaced exclusion “o”. However, the replacement is no more consistent nor clear than exclusion “o” was. The heading of the section in which it appears is “VI Broad Form Property Damage Liability Coverage.” The grant of coverage for contractual liability is founded on a three-step trek through the policy and its broad form endorsement. Exclusion 1(a) states:
“This insurance does not apply:
(a) to liability assumed by the insured under any contract agreement except an incidental contract; but this exclusion does not apply to a warranty of fitness or quality of the named insured’s products or a warranty that work performed by or on behalf of the named insured will be done in a workmanlike manner.”
Therefore, after reading the first page of his policy, the insured has reason to be optimistic about his coverage in the event that his work*196manship is faulty. Both of the exceptions to Exclusion 1(a) appear to embrace a claim for defective workmanship. The Broad Form addendum broadens the definition of an “incidental contract” to include “any oral or written contract or agreement relating to the conduct of the named insured’s business.” At this point the prospect of coverage is quite encouraging indeed. Not until page 3 of the addendum does the provision purporting to divest the insured of the specifically granted coverage appear, in a most inauspicious place and manner. This is the very essence of ambiguity. The backdoor coverage for warranties on work performed is logically inconsistent with exclusion of coverage for faulty workmanship. Although I have some reservations concerning this treatment of exclusion “o”, I am driven by stare decisis, and the fact that the Gollan language existed for most of the decade after Gollan without correction, to find coverage for the defective construction claim under the basic policy.
In contrast, the umbrella policy does not include the backdoor warranty coverage language and has a nice clear exclusion to property damage coverage, that appears directly below and on the same page as the grant of coverage, in a section headed “Exclusions.”
2.2 Exclusions. This policy does not apply:
“(e) to property damage
(3) to work performed by the named insured arising out of the work or any portion thereof,... if such property damage occurs after such work has been completed or abandoned and occurs away from premises owned by or rented by the named insured.”
The umbrella policy should serve as the model for clarity in this area.
For the defective construction claim, I would find no umbrella coverage. The umbrella policy does not include any design exclusion. The grant of coverage is broad enough to include contractual liability, and there is no limitation on such coverage. I would find umbrella coverage for the design liability. An umbrella policy has two purposes. The first is to increase the dollar amount of coverage afforded to the insured. The second is to provide coverage for risks not covered in underlying liability policies. The MacMillin Company, Inc. had a reasonable expectation that its umbrella coverage filled the design coverage gap in its underlying coverage.
Reading the policies as a whole discloses coverage for both of the negligence claims. The underlying liability case, however, included *197uncovered claims. The case was settled by the insured. Issues material to the obligation to defend and the obligation to indemnify are unresolved. I would reverse, finding coverage as outlined above, and remand to the trial court for a determination of what this coverage means in terms of money,
Batchelder, J., joins in the dissent.